VRSimVer2.0 User Manual
Contents
1. Shows the model display options available e Animate the transient solution of variables Page 75 Variables tab The variable tab list out all available variables and set the current variable being shown in the cutting plane Display Graph Plot Report Streamlines Vanables View Speed m s X velocity m s Y velocity m s Z velocity m s Temperature deg C Gauge Pressure Pa Concentration kg c kg fluid Turbulent Kinetic Energy m 2 s 2 Turbulent Dissipation Rate m 2 s 3 The standard types of variables that are available are VETE Mare TT Description This is the resultant velocity obtained from the combination resultant of the X Y Z velocity components X velocity m s The velocity component in the X axis direction Y velocity m s The velocity component in the Y axis direction Z velocity m s The velocity component in the Z axis direction m s Temperature The temperature in the field Gauge pressure Pa Pressure difference with a reference pressure Concentration kg c kg fluid Associated with concentration model N A Turbulent Kinetic Energy m s Also known as TKE Used to describe turbulent s 2 Turbulent Dissipation Rate m Also known as TDR Used to describe turbulent Page 76 In case Indoor Air Quality IAQ simulation model solution exists the additional types of variables that are available are2. 074 074 09 Prandtl Number MEN Constant Turbulence Viscosity C1 100 The standard K epsilon x e is a turbulence model which falls under the Two Equation type All of the available parameters need to be setup Optimal values are provided by default Page 61 Flow Model Turbulent Le Prandtl Number The Re Normalisation Group RNG K epsilon method evolves from the standard K epsilon method and falls under the same group The approach attempts to account for the different scales of motion through changes to the production term The method generally offers more accuracy than the Standard K epsilon approach but with the expense of stability and convergence The default value is set to this model but the user is suggested to try the other two turbulence model if the simulation tends to difficulty in achieving solution convergence Flow Model _ Turbulent Le z Prandtl Number The No Flow mode is for situation where only the heat transfer of the fluid is to be calculated without considering the fluid flow The No Flow option is meant for heat conduction purpose It does not solve any flow governing equations Navier stokes Equation NSE but the energy equation alone This feature is rarely used Page 62 Flow Model Ok Turbulent Prandtl Humber 0713 Ge 07 es Linearization model The linearization model refers to the linearization of the source te
3. Pressure Pa Temperature deg Celcius Leave the fields in its default value if you are not particularly certain on its true value Matrix Solver tab The matrix solver controls how the iteration and what method to be employed to solve the matrix of the problem in the solver The inner iteration controls the number of inner iteration in the method chosen Page 64 Advanced Solver Setup Matris Control Matis Solver Method Inner Iteration velocity GAUSS SEIDEL e YY velocity GAUSS SEBEL Ww 2 velocity GAUSS_SEIDEL v i 5 Turbulent Kinetic Energy Dissipation Rate Pressure PRE_BICGSTAB w Temperature GAUSS SEIDEL There are two available methods in the matrix solver option The GAUSS SEIDEL option refers to an iterative method which is an improvement over the Jacobi method It is the simpler on the implementation scheme over the other method The second option is the PRE_BICGSTAB which is an acronym for Preconditioned Bi Conjugate Gradient method Stabilised It is also an iterative method but requires a more complex implementation over the Gauss Seidel iteration method The Preconditioner speeds up the convergence of the BICGSTAB iterative method by replacing the original matrix with something closer to the identity matrix Relaxation tab The relaxation tab list out the values of Relaxation Factor used to control the convergence speed of the simulation but at the cost of stabili
4. effect such as field need to be zero representing Grill Chair Legs etc eGood for showing objects that has little to no significance effect on the flow in simulation Adding a Component To add a component to the table list choose the tab of the component Block Setup Virtual Block Setup Opening Setup Block Setup 9 Virtual Block Setup 14 5 Opening Setup 12 Add Click the button in the panel Page 36 Add Remove db gt Block Setup 5 Virtual Block Setup 0 Opening Setup 0 The added component will have a new row of entry fields Enter the desired dimension and position of the component accordingly Deleting a Component To delete remove a component from the table list choose the tab of the component Block Setup Virtual Block Setup Opening Setup Block Setup 9 Virtual Block Setup 14 5 Opening Setup 12 Ensure that the object to be removed is highlighted in the table Note Highlight just one of the cells in the table i SS SSS S Block Setup 9 virtual Block Setup 14 Click the J button in the panel Boundary Condition setup The Boundary Condition of the objects in the Shape _Library Editor is only accessible in this mode and not in the main viewer Table below list the BC feature available for each geometry components see Geometry setup Page 37 Block Virtual Block Opening e Thermal BC e No BC
5. Mode CE RET Musantara testH ateez Be EE EE E E Be E E H E Exporting objects To export the objects inside the database to the database of VRSim in another computer access the Export_Shape_ Library Editor window Highlight the object either Group list or Object name wished to be exported in the Select file list box and move it to the Export file list box by clicking the button Export Shape Library Editor File Tools Select file List of entries to be selected Export file List of entities that will to export file be saved Root Floor B Furniture Europe Chair Table MK 11 Parkcity gt Pavallion R22 Cooling Mode CE R22 Cooling Mode CK R22 Heating Mode CK R4104 Cooling Mode CK A4104 Heating Mode CK RET Nusantara testHafeez gt gt EE E tt Page 40 Export Shape Library Editor File Tools Select file List of entries to be selected Export file List of entities that will to export file be saved Root 5 Root s Floor Furniture Europe Cabinet Chair Table MK 11 E Parkcity Pavallion E R22 Cooling Mode CE R22 Cooling Mode CK mu R22 Heating Mode CK H R4104 Cooling Mode CK H R4104 Heating Mode CK H AKT Nusantara testHafeez lt lt Repeat the process accordingly until the desired exported object is listed in the Export file list box Then save the export file by File gt Save or
6. Variable name Description Draft Risk DR Draft Temperature DT See section Predicted Mean Vote PMV Advanced Tools Indoor Air Quality IAQ Predicted Percentage Dissatisfied PPD The currently set variable and its unit is indicated in the main viewer as shown ES ViRView Virtual Room Viewer File View Help V_r mis Resultant Velocity Global 0 70 Current variables and its unit To set the viewed variables using the mini tab click the variable radio button that wished to be viewed Another way is to right click on the variable display in the main panel A pop up menu will appear Page 77 Resultant Velocity Temperature Pressure Component velocity Concentration Indoor Air Quality 140 Simply click any variable that you wish to set as current Note that the three most commonly accessed variables Resultant Velocity Temperature and Pressure is put on top of the list View mini tab The view mini tab controls the type of display view in the cutting plane see Additional Tools Cutting Plane Page 78 Display Report Streamlines Yariables View Option Animation Contour Mode Global Local Flat Contour Smooth Contour Ol Velocity Yector Yector Scaling Factor 1 sl Line Contour No of Contour Lines mg Mesh The table below lists the available features in this tab RA Global Local This mode shows how the plot range i
7. for redesigning the user interface The overall concept is to let the user just focus on what they want to do instead of how to do it Page 69 How to use the software A tutorial has been provided with the software to let the user have an on the fly experience of using the VRView software together with VRSim This user manual adds further explanation on the mechanics of the VRView software to complement the tutorial guide Page 70 File Loading Components of solution files There are three components of the solution files These components define three different aspects of the solution data They are the geometry aspect GeomData dat mesh coordinate aspect VIEWMESH dat and the mesh vertex values aspect RESULT DAT or RESULT XXXX DAT ii iii File types GeomData dat This data file represents the geometry of that is originally defined in the VRSim software The geometry is broken to blockades including Virtual block type in VRSim and openings geometry File types VIEWMESH dat This data file represents the mesh field which contains the coordinates of the mesh vertex The vertex region definition of solid and fluid is also stored here File types RESULT DAT or RESULT DAT This data file represents the scalar values in each of the vertex in the mesh coordinates There are two formats RESULT DAT filename indicates the simulation is Steady state
8. heat transfer occurring from air conditioning units within a space The software will solve the fluid and heat transfer numerically and predicts the solution from a given model This VRSim code was initiated from a joint collaboration project between OYL Research amp Development Center Sdn Bhd with the CFD team from Universiti Tenaga Nasional Malaysia The concepts originated from the project were then extended to the current version of this VRSim software Example contours of air flow Computational Fluid Dynamics CFD The two traditional approaches to engineering are the analytical approach and experimental approach Computational Fluid Dynamics CFD added another dimension to engineering study by using computer and numerical method to solve engineering problems CFD also plays the role as a complementary approach to both analytical solution and experimental results While it is true that CFD can never be viewed as a total substitute for experimental result or analytical study if it is used correctly it is on par with the trustworthiness of the other two approaches CFD originated from the aeronautical and aerospace industry and it has spilled into other critical applications such as automobile turbo machinery bioengineering and electronic cooling system and the list keeps expanding rapidly Nowadays CFD is commonly found in automobile Page 5 companies such as Proton Toyota and others This is due to its role in reducing cos
9. setup e Opening Type available e Thermal BC e Velocity BC e Diffuser Mode e Specified Mass Flowrate e Specified Pressure To open the window for setting the Boundary Condition click the Boundary Conditions gt Show Panel option in the menu strip AEE Pa SE UE EE E E r VRS Virtual Room Simulator File View Boundary Conditions Show Panel Now Width Length Height Block Setup 9 Virtual Block Setup 14 Opening Setup 12 The Boundary Condition window will appear Page 38 Boundary Conditions Thermal 2 Spec Nominal Cooling Capacity Temperature Bominal Cooling 5860 wm Flow Velocity gt MN gt C Diffuser Mode Angle ET deg Spec Flow rate Pressure F For further explanation on the Boundary Condition setup see section Boundary Conditions Import amp Export Database file Export Create update file To view the Export Shape_Library_Editor window go to the Shape Library Frey tab panel and click the button Simulation Shape Library View The Export_Shape Library Editor window will appear Page 39 Export Shape Library Editor File Tools Select file List of entries to be selected Export file List of entities that will to export file be saved i Root E Floor Furniture E urope ME 11 Parkcity Pavallion R22 Cooling Mode CE R22 Cooling Mode CK R22 Heating Mode CE A4104 Cooling Mode CE RH04 Heating
10. solver to either solve the solution as steady state solution or as unsteady Transient solution Transient Setup Time Dependence Unsteady w From another point of view transient setup is also termed as the Time Dependence due to the fact that the term in the general fluid flow equation is t termed as zero in steady state solution and non zero in transient Unsteady solution Flow model The flow model refers to how the Navier Stokes equation is solved for turbulence flow There are three main category Laminar Turbulence and No flow mode The Laminar option will disable all the parameters reserved in this group box together with the linearization model scheme This option is most suitable if the simulated flow is Known to contain minimal turbulence Page 60 Flow Model Laminar 44 J o7is4 S 071 es Turbulent Prandtl Humber Turbulence category is the most common option as most flow develops turbulence behavior in its domain There are three available model for Turbulence category Zero Equation Chen Xu model Standard K epsilon and RNG K epsilon The zero equation Chen Xu turbulence model is a turbulence model which falls under the One Equation type The user needs only to setup the turbulent Prandtl number and the option of applying constant turbulent viscosity value Optimal default value has been provided Flow Model ero E quation Chenu w Turbulent
11. with different setting of the simulation Qn A MA KM i tcay Home Insert 4a Copy Page Layout A a cut Arial Formulas 7110 Data Atar Paste SIETE TE gt VP Format Painter Bot UE OA Simulation_Report xls Compatibility Mode Microsoft Excel non commercial use Review Sj Wrap Text El EE Merge amp Center 9 Conditional Format Cell Formatting as Table Styles 3 Insert Delete Format X 9 Fill 2 Clear ao x O 5 x AutoSum AF ww Z Sort amp Find amp Filter Select Clipboard E Font E Alignment Styles Cells Editing A4 v a fe Room Size meter B G D E K L M N P Q R Room Size meter i 9 9 32 ShapeLib ShapeLib 9 ShapeLib 10 ShapeLib 11 ShapeLib 12 ShapeLib 13 ShapeLib 14 ShapeLib 15 ShapeLib 16 ShapeLib 17 Custom 18 ShapeLib 19 ShapeLib 20 Custom 21 Custom 22 Custom 5 6 Type 7 8 25 Fluid Property 26 Density 27 Specific Heat 28 Dynamic Viscosity 29 Prandtl number 31 Model 32 Time Dependence 33 Turbulence Model 34 Apply Heat Model 35 Apply Bouyancy Model 36 Iteration 37 Max iter time step 38 Convergence criteria 39 Transient parameters 40 Total Time Steps 41 Time step size 42 Result Interval 44 Initial Conditions 45 Start Mode 46 X Velocity 47 Y Velocity 48 Z Velocity Group Floor Furni
12. with a single result file The RESULT DAT pattern e g RESULT0000 DAT RESULT0010 DAT RESULTO020 DAT indicate a series of transient Unsteady result files which are spaced for each time step Following the given example time step Os 10s 20s Page 71 Loading file using AutoLoader feature This is the default method for loading files into VRView In the menu strip click the option of File gt Load gt AutoLoader th ViRView Virtual Room Viewer Autoloader Ctrl Lb Load Files Ctrl F The open file dialog box will be visible Look in E Trial 1 eg AREA dat RESULTO110 D4T GeomData dat RESULTO120 DAT My Recent GRID dat RESULTO125 D4T Documents Restart dat WIEWMESH dat RESULTOOOO DAT RESULTOOLO DAT RESULTOO20 DAT RESULTOOSO DAT RESULTOO40 DAT RESULTOOSO DAT RESULTOO6O DAT RESULTOO O DAT RESULTOOSO DAT RESULTOOSO DAT RESULTOLO0 DAT gt File name Geom ata dat v My Network Files of type All fles 3 Go to the folder that contains the entire necessary result file to be loaded example shown in figure Highlight any file that is in the folder and click Open VRView will appropriately detect all the necessary filenames that needs to be loaded into the software Page 72 Loading file using Load Files feature To access this feature in the menu strip click the option of File gt Load gt Load Files ViRView Vi
13. File gt Save As Export Shape Library Editor Export file List of entities that will be saved T la Save Ctrl 5 to be selected Save s E Root Exit RAHA Cooling Mode CK Force E SCE 1OC H MK 11 5CK15C H E Parkcity ACE Z04 H Case 1 SCK20C H Case 2 SCK254 H Case 3 SCK304 H W Pavalion B A22 Cooling Mode CE CE25D H H A22 Cooling Mode CE H R22 Heating Mode CE 5CK 406 H 5CK504 H B A4106 Heating Mode CE 5CK10CR H SCK15CR H H RET Nusantara BEE 206R H H testH afeez SCE ZOCR H SCK 2 54R H SCE SOA4R H SCKAQAR H SCESOAR H An exported file with VRShape extension is created Creating update file To automatically create an update file include all objects into export file access the Export_Shape_Library_Editor window Go to Tools gt Create Update File option in the menu strip Page 41 Export Shape Library Editor Saks File Tools Sele Create Update File ted Export file List of entities that will to export file be saved SCE 15C H BER204 H ACE Z0C H ACE 254 H ACE304 H SCE 404 H BCE 5OA4 H A4106 Heating Mode CE ACE OCR H FCE 15CR H ACE Z04R H ACE ZOCAR H ACE 2Z54R H 5CR304R H BCE404R H BER504R H RET Nusantara DS testH ateez park orange Specify the location where the file will be saved to default extension VRShape Save in My Documents Y F E E Microsoft Visual Basic 2005 Power Packs my Musi
14. Furniture Object Name Cabinet v gt Add Object s i pii Click the The object is deleted from the list and the model viewer Page 12 Editing Objects Position ObjectBrowser ID Group Name Orientation pos m pos m Zpos m 0 Dimension the ObjectBrowser ObjectBrowser Name Orientation pos m Ypos m Front v 0 1 Front w0 0 2 Furniture Cabinet Front j 2 Zpos m Front v Custom Object Library Object Object Group Furniture Object Name Cabinet i sp Add Object Set the position coordinate following the Xpos Ypos Zpos fields in W Update the object list Click the M me ator to update the change Choose one of the objects desired to be edited from the object list in Height 2 Go to the Custom Object tab and change the dimension field values Page 13 Custom Object Library Object Custom Slze cra 1 testa O o a Click the button to update the change NOTE Dimension edit and color edit is only applicable for Custom type object Color Choose one of the objects desired to be edited from the object list in the ObjectBrowser ObjectBrowser Name Orientation xpos m Ypos m Zpos m block2 Front o 0 0 Custom Slze block44 Front vio 0 0 Width PJ Length Y Height 2 Page 14 Go to
15. OK The floor color is changed accordingly Page 49 Transparency view option Transparency feature comes in handy when the model in the Main Viewer is cluttered or blocked by obstructing blocks and openings To manipulate the transparency there are two options from the View Panel and from the menu strip The view panel offers simple transparency toggle for controlling block and opening transparency Simply check or uncheck the checkbox displayed in the View panel The sample figure compares the effect of toggling the opening transparency checkbox 100 Opening transparency Page 50 The menu strip offer a more advance transparency control Open the transparency control window by clicking View gt Tranparency setup Transparency Blocks Transparency 4 ii JEJ Openings Transparency lt E JEJ Simply adjust the transparency slider to change the level of transparency 0 transparency 50 transparency 100 transparency Scale display The scale resolution displayed in the viewer can be set in the View panel by adjusting the values in the Ruler Scale fields Page 51 A scale all mode is available in the Ruler Scale window accessible through View gt Scale setup YRS C Wecuments and Settings anuar Desktop sample wee ile news wre Simulation Shape Library View View Pane mode For larger model view a mode which hides the side panels is avail
16. RAPH PLOT TAB anria ENEE NTEN OEA 87 INTRODUCTION a a a E ricos 87 PROFILE GRAP As O ce a Os Jel a O O O a Ad 88 TRANSIENT CRA A dd dado 89 SAVING PLOTTED GRAPH aaa darlo 91 SAVE AS MAGE raan a a E ds 91 SS O a E REN 91 REPORT TAB nonnai a a a a a a a a a a a a ia a 93 INTRODUCTION E LAE EA A te A EA E E EE A E E O L E ET 93 IMAGE PANE EL E EEA O E EA E AAE E OE L A T 94 AANO VIO GO sa A A Aa 94 BLOWSIMO WINTER SNA 95 DOVE CAG INE ia aiii 96 SAVE HMOCES GO Oder ale a aa 97 REPORT DETAILS ao 98 Created Reporte O ee ae 99 STREAMLINES icnn E E A E eee eas 101 INTRODUCTION cree E E E E E pense eee 101 STREAMLINE OPERATIONS dida 102 SHOW IGE stredmi NE er a bass ee oun te vee a eon eee saw eae oak uae ave 102 POSITION COOT INGLE OS TECOS ai taueaeh en eat ea 102 Adding s TECOS AAA AAA ETAO EEA 102 REMOVE STEREO AAA AE AAA AA A E 104 CIO FUESEN CASA SA A ais 104 STREAMLINE ANIMATION see a id 105 STREAMUNEDENS assi socio oe E A aa tb eE 105 ADDITIONAL TOOLS canica iii 107 MAIN VIEW CONTRO Sato idas 107 PREDEFINED VIEW CONTROL aa N lala oe anda auiennd acnmenina peng nedenuremy as ea roca 108 CUTTING PLANE CONTROL E oud couemmcoaueennlsantac aaauerenromeemcewienrs 108 SHOW DIGC the CUTTING DANE eta 108 IVIOVINIG EME cutting DINO eias sida 108 AA O a S 109 Page 4 Introduction to VRSim Virtual Room Simulator VRSim Virtual Room Simulator VRSim is a Computational Fluid Dynamics CFD software used to predict air flow movement and
17. STL Default view Rig Back Bottom Cutting plane control Show hide the cutting plane To view or hide the cutting planes toggle the checkbox shown in the cutting plane control panel Moving the cutting plane To move the cutting planes move the CE slider or change the number in the numericUpDown control in the cutting plane control panel Page 108 Show Hide pane view To toggle the show hide state of the pane view go to View gt View Pane option of the menu strip option View Pane Ctrl F ye Lif j ViRView Virtual Room Viewer File View Help V_r m s Resultant Velocity Global pan 000050590 Display Graph Plot Report Streamlines Variables View Option Animation Speed m s O X velocity m s O Y velocity m s O Z velocity m s O Temperature deg C O Gauge Pressure Pa Concentration kg c kg fluid Turbulent Kinetic Energy m 2 s 2 Turbulent Dissipation Rate m 2 s 3 Domain 2 m x 8 m x 2 m ViRView Virtual Room Viewer DEX V_r mis Resultant Velocity Global 4550 000500090 Domain 2 m x 8 m x 2 m Page 109
18. U OMG CLES nado riica 58 NADO AIP QUOI IAQ ii vues tev osaptadousdduset a tesstanvacuia ncatedeay ete ead 58 FIOW MICO CH LOD nia AN A A a 60 Tonsen SECU Di sia rara 60 IIA lo 60 Linearization MOE sstonpp ds 63 BUOYANCY Modelo ssieutoaadae hanintatostaui a 63 LAITIGI GONGITION UG D A E A A Dowel palette 64 Le EAS Y ae 2 AA NR II A A PE Oe SO 64 RETOXNGUION TOD acai sk A a a es ee 65 PUES GO A SA E EEAS IA aac E cw EE EE EE TE EE EE E A IN 66 INTRODUCTION TO VR VIEW ui aii A E EA a 67 VIRTUAL ROOM VIEWER VR VIEW aiina aaa dl des 67 VRVIEWAS A POST PROCESSOR o de 68 ATASK SPECIFIC SOFTWARE stax e cece ots al ds eos le ro no o ae ac a e 69 HOW FOWUSE FE SOFTWARES ted o ido dense E ao eo ds DA ado Dar da 70 FILE LOADING aia 71 COMPONENTS OF SOLUTION FILES alado cgis taa dao O 71 LOADING FILE USING AUTOLOADER FEATURE scsscscoccscoccsceccecsccecscescncescscassecsseecsseecsceesscassscaseecssaecsseecseanans 72 LOADING FILE USING LOAD FILES FEATURE ccscescscoscscoccsceccecsscecsccscscessscaseecseecsseecscessscessecesaecsseecsteecseaeans 73 DISPLAY TAB A E EE a eda St eats naa ow alee EOE ES 75 INTRODUENO Ns a ll e ld a e e A 75 VARIABLES TAB as its dis eii rta 76 VIEW MINETTA P Os a tia tt os 78 OPTION NINE TAB la aliada 83 Room VIEW Teatres a A A A A AA A A cd 83 ODICCE VIEWTea tU AAA A AAA A A AA AA ida 84 ANIMATION MINITAB 0 o AONT 84 Animation control act 85 Video streaming CONTO e ni a A e 86 G
19. VRSimVer2 0 User Manual INTRODUCTION TO VRSIMiucvininnanisariniarii rE AEEKO RENESAS EN VEREST 5 VIRTUAL ROOM SIMULATOR V RS Mita dido ica 5 COMPUTATIONAL FLUID DYNAMICS CFD siii da 5 ROLE OF VWIRSIN SOFTWARE citan laica 6 WHO SHOULD USE THE SOFTWARE ias 6 WHERE YRSIMAPP LIES cre erie ta cs ech sonic tence capeccs nena baeeae adept nsauceceachansntaeioandesnsadencacastaccedtouenaeueeateanesn 6 HOW TO USE THE SOFTWARES ica 7 GEOMETRY SETUP cias ii 8 INTRODUCTION cuscnatansc alaridos nerds 8 DOMAIN GEOMETRY SETUP norris iaa 8 SETTING THE DOMAIN EOE UR Ver Si no cea geese ren 8 OBIECF GEO MEP Y SETUP tac cnc guea and sa sedsaneusas fan caned eseegaceare used saceuene bea naseecaneucn 9 SETTING OBJECT EON E MIR Vaio 10 MES naco ica 16 INTRODUCTION us 16 NUMBER OF CB anna iodo cada 16 o PP ER A O 17 MINIMUM GAP SPACING siinnivatna iii ii iii 17 GENERATING MES ua its 17 WARNING DISPLAV dba 18 BOUNDARY CONDITIONS SETUP cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccsceccecs 19 INTRODUCTION bie riciiaa 19 TRERMAL SETUP soii dean iio msde auteneatuemseen ness 20 OPENING R ES o cnica ido ona 21 VELOC SETUP acallar nadiaiss 21 DIFFUSER MODE suas ciencia E E ic osacicos 22 o A 22 SPEED PRESSURE ni o asta oia 22 SOLVER CONTROLS aaa 23 HINO IC TIO Ni o T a T T 23 SIMULATION MODE aida 23 HEAT TRANSFER IMIODE barones ocean ee Te 24 By INI eects aaa 24 no A siete tin daa unaoie tats naan eciasae ie e
20. able Go to View gt View Pane toggle option Page 52 VRS C Documents and Settings anuarWesktop sample vrs filelMK 11 Type B1 vrs2 File View Tools Shape Library VRView Help Simulation Shape Library View VRS C Documents and Settings anuarWesktop sample vrs filelMK 11 Type B1 vrs2 File View Tools Shape Library VRView Help N PERRY 1194 19 1 The same effect can be made using the Ctrl P shortcut key Page 53 Advanced tools Reporting simulation setup lf there is a need to report the simulation setup used in a particular simulation this can be automatically prepared using the advanced tool Reporting simulation feature Simply click the Tools gt Create Simulation Report in the menu strip and specify the folder which the report will be saved to with a default filename of Simulation_Report xls YRS Virtual Room Simulator File View Shape Library VRView Help Browse For Folder Write report in Folder MOE 5 Sy Microsoft Visual Basic 2005 Power Packs 2 My Music 5 my Pictures CO NetBeansProjects C TeohsaviRecorder i Visual Studio 2005 Sy Visual Studio 2008 4 My Computer a My Network Places e Recycle Bin v Make Mew Folder A message will indicate if the operation is successful Page 54 VRSimVer 0 The Simulation Settings has been successfully saved Opening the saved Simulation_Report xIs file will show multiple worksheets
21. c My Recent E my Pictures Documents My Videos NetBeansProjects O TeohSaviRecorder Visual Studio 2005 Visual Studio 2008 My Computer m File name pu pdateShape 08282008 My Network Save as type VAShape Import Update database from file To import update the database simply go to the Shape Library tab panel and click the access button Specify the update file from the file dialog box that appears Any new object entries will be added to the existing database Any duplicate object entries same group name same object name will be overwritten by the import update file The old object entries will be retained Page 42 Persistent Mode When loading a saved vrs file it common to have a duplicate entry same Group Name same Object Name from the file This duplicate entry may have a different geometry or BC Thus there is a choice of either using the entry from the file or using the entry from the current Shape Library database If the geometry and BC model from vrs file is to be used disable this mode The same entry in the Shape Library database will then be overwritten by the new entry This mode is the default mode preference to retain loaded model representation lf the geometry and BC model from the current Shape Library database is to be used the duplicate model will be replaced by the current Shape Library in the memory The entry in the vrs file is not replaced until
22. cable only to Outlet Pressure and Atmospheric Boundary opening type Page 22 Solver Controls Introduction Solver refers to the code which runs to solve the fluid flow problem submitted to it It can be said to be the brain part of VRSim software The input of the solver is the geometry definition and boundary condition of the said geometry The solver control window acts as a command center which decides how the brain engine is to be controlled To view the solver control window click the access button A basic solver control window will appear SolverSetup Simulation Mode New simulation Continue Simulation Models Simulate Heat Transfer Simulate Buoyancy Toref 27 00 deg Celcius C Simulate LAG Iteration Setup Mas Iteration tine step Convergence Criteria 0001 95 Transient Parameters Number of time steps Time step size o seconds Save result at every time step Simulation Mode The simulation mode offers two options New Simulation option offers fresh simulation iteration This option is the choice when a simulation is to be done for the first time or when a new simulation iteration starting from zero is to be overwritten over an old simulation run Page 23 The Continue option is used when the simulation is to be continued from a last simulation For example a simulation has been run from 1 to 100 iterations To produce a s
23. click the Add button To add a new object to the tree list click on any of the existing on object in the desired group and click the Add button New group New object Page 30 Deleting group object To delete remove a desired object from the tree list simply highlight the object by clicking on it and click the Remove button A pop up window prompting the action will appear Click Yes to continue Warning There is no Undo feature in the software Ensure that the object to be removed is the correct object Copy and paste object 1 To a group list To copy an object from a group A to another group B highlight and right click the mouse on the object to be copied Click the Copy Object option from the pop up menu that appears Copy Object Paste Object FoF oH HF Highlight and right click the target Group B where the object is to be copied to From the pop up menu that appears click the Paste Object option Page 31 dP Add Add Remove Copy Object Paste Object Duplicate Group The object is then copied from Group A to the target Group B This is beneficial when a similar objects but with different group is to be constructed The copied object then can be easily edited accordingly ii Into an existing object To copy an object A to another object B highlight and right click the mouse on the object to be copied Click the Copy Object option from the pop up menu t
24. configurations for example placement of a diffuser without having to build a new prototype This motivates one to resort to numerical simulation technique to study the air movement in an indoor environment by solving the fluid flow governing partial differential equations In VRSim based on the available CFD flow solutions parameters concerned with thermal comfort can now be determined These parameters are well known as the Indoor Air Quality IAQ indices Four IAQ indices are considered 1 Draught Risk DR Draught is the unwanted local cooling of the skin caused by air movement It is one of the most common causes of complaint and the index indicates the risk of a person to feel draught in a certain region 2 Air Diffusion Performance Index ADPI ADPI is an indicator which accounts for the presence of draught by considering only the Draft Temperature DT written as a function of both the air temperature and air movement 3 Predicted Mean Vote PMV adopted as ISO standard The PMV indicates the mean vote based on ASHRAE scale ranging from 3 to 3 hot warm slightly warm neutral slightly cool cool and cold Page 59 4 Predicted Percentage Dissatisfied PPD adopted as ISO standard PPD is an index which represents the percentage of the group that will report thermal discomfort It is based on the values of PMV Flow Model tab Transient setup The transient setup sets the mode of the
25. coord Q Y coord U Z coordi U p Add o Click the button to add a streamline into the view Display Graph Plot Report Streamlines Streamline density O Animate J Streamline 1 Show Streamline x coord 1 Y coord 2 Z coord 1 5 Add Page 103 Remove streamline To quickly move a streamline from the view choose a streamline to be removed from the available streamline list Right click on the item Display Graph Plot Report Streamlines Streamline density 77 O Animate DUELE PEEP EEE PP Pee ee SEE DEERE COLARE ORT RO MOR ROR 0 Streamline 1 Show Streamline x Remove Clear x coord ao Y coord 7 coord 15 Add option in the pop up menu to remove streamline from the list Clear all streamline To quickly clear all streamline from the view Right click on any of the item in the list Page 104 Display Graph Plot Streamlines Streamline density 77 O Animate onal Streamline 1 Show Streamline x Remove Clear X coord Y coord 7 coord 15 Add cl ee Click on the option in the pop up menu to clear all streamline from the list Streamline Animation i o O Show Streamline To animate the streamline in the main view ensure the checkbox in the streamline tab is checked Animate the streamline by checking the Animat checkbox in the streamline tab Streamline d
26. ct include Wall Mount unit model SL outdoor unit model and a standing human model Page 9 Custom Blocks Object Openings ShapeLib Virtual Block Opening Setting Object Geometry To set the object geometry click the window will appear ObjectBrowser Orientation xpos m Ypos m Zpos m Custom Slze Width DJ Length Y Height 2 Page 10 Adding objects Custom type In the ObjectBrowser window go to the Custom Object tab Custom Object Library Object Custom Slee com C a Heals dm Set the dimension of the block or opening where one of the size field will hold the zero value Click the button and a block opening can be seen in the model viewer and object list ShapeLib type In the ObjectBrowser window go to the Library Object tab Custom Object Library Object Object Group Object Name dh Add Object Page 11 Object Group Choose the Object Group from the dropdown list Example Furniture group Choose an Object Object Mame Name available in this group e g Cabinet Click the button in the tab and a cabinet object will be added to the model viewer and the list Deleting Choose one of the objects desired to be deleted from the object list in objects the ObjectBrowser ObjectBrowser pos m Ypos rm Zpos rm Custom Object Library Object 0 y oO Object Group
27. ensity The streamline density can be controlled by sliding the AAA tie bar in the streamline tab until a satisfactory density is viewed The effect of various streamline density level is demonstrated in the table Page 105 Resultant Velocity Resultant Velocity Domain 2 m x 8 m x 2 m Domain 2 m x 8 m x 2 m V_r mis Resultant Velocity V_r mis Resultant Velocity Domain 2 m x 8 m x 2 m Domain 2 m x 8 m x 2 m Page 106 Additional tools EA ViRView Virtual Room Viewer File View Help V_r mis Resultant Velocity sY plane lt 2 plane x YZ plane Display Speed m s x velocity m s Y velocity m s Z velocity m s Temperature deg C Gauge Pressure Pa Concentration kg c kq fluid Turbulent Kinetic Energy m 2 s Turbulent Dissipation Rate m 2 s 3 Domain 2 m x 8 m x 2 m Main View controls Figure shows functions that can be used to control the Main View view using a mouse A mouse without the middle mouse button can use Ctrl RightMouseButtor to zoom In and out Page 107 Predefined view control The pre defined view could be viewed by stroking the keyboard key as listed in table Key s Action esis F Toggle to Front view B_ Toggle to Back view COR __D___ Toggle toDefaultview Toggle to Right view Another way is to use the toolbar cr Lo q oe
28. eters The IAQ Input Parameters section section list out the Indoor Air Quality IAQ simulation parameters that could be changed by the user The default values are set for a typical standard condition with no activity For further explanation on IAQ see Indoor Air Quality IAQ Input Parameters Clothing Thermal Resistance A og Metabolic Rate Ameta External Work Accomplished Partial Pressure of Wapour in Air Py Indoor Air Quality IAQ Indoor Air Quality IAQ is associated with thermal comfort In broad terms thermal comfort is a condition in mind whereby satisfaction with the occupied thermal environment is achieved In view of more than 90 of a typical person s time is spent indoors it is crucial to ensure that the indoor environment is as comfortable as possible Page 58 Generally there are two main streams of studying thermal comfort IAQ full scale laboratory testing and simulation model Of course these two streams differ amongst each other in the aspect of ways to obtain the flow or thermal property which must be determined prior to determining the thermal comfort level in an enclosure Full scale testing is undoubtedly reliable however it is generally costly and results are only applicable for indoor environments that are identical to the prototype studies On the other hand numerical model is attractive in a way that once it Is validated the model can be used with other user defined
29. ew duplicate group will then be created Page 34 Limit on number of entries Currently the number of entries of the database is limited to Component Maximum limit Group list 75 units Object list 50 units per Group Block 100 units per Object Opening 100 units per Object Virtual Block 100 units per Object Geometry setup The geometry of an object can be composed of three possible components Each component has two attributes namely dimension and position Component Block Opening Virtual Block Position Dimension Size ZPosition YPosition Width Height Length XPosition These parameters of the components may be viewed in the Object Components table Page 35 E Boundary Conditions No Width Length Height 1 775 0 877 D15 0587 2 oss was CC CCC OOOO 3 oss was joes war ws w OO O a os 2mm se Add Remove rs 5 Block Setup 9 Virtual Block Setup 14 Opening Setup 12 Directly edit the parameter values to change or set any component s dimension and position A summary on the type of components and its properties is shown in the table Block Virtual Block Opening eRepresent real physical eRepresent virtual block or eRepresent real physical block opening in simulation opening eDimension field must not eNo real physical effect to eDimension need to be be zero simulation represented correctly eUsually used for realism one of the dimension
30. hat appears eS is cae Cal Copy Object Paste Object Highlight and right click the target Object B where the object A is to be copied to From the pop up menu that appears click the Paste Object option Page 32 Furniture Cabinet Chair Table MK 11 1 d Tahlen Copy Object R22 Cooling Mode CE R22 Cooling Mode CK R22 Heating Mode CK R4104 Cooling Mode CK R4104 Heating Mode CK RKT Nusantara YDS testHafeez I 5 0 Ff Cabinet Chair Table MK 11 1 2 Parkcity Parvallion R22 Cooling Mode CE R22 Cooling Mode CK R22 Heating Mode CK R4104 Cooling Mode CK R4104 Heating Mode CK RKT Nusantara TOS testHafeez The object A is then copied to object B original name of object B is retained This operation is useful for duplicating objects into a single object for example an object where a few outdoor units are to be placed together see sample figure Page 33 NN Whitt Lge Ze AN A Duplicating group In cases where a whole group is to be edited and modified while the original group is to be retained a Group duplication feature is also available For example a similar group of furniture for Europe market is to be redimensioned to fit into a furniture group for Asia market Start off by highlighting and right click the original group Paste Object Duplicate Group From the appeared pop up menu click the Duplicate Group option A n
31. iew software The animation display feature is for animating the change of the contour plot and vector plot over time transient time step and not to be confused with the animation of streamline which is only for one time frame Page 84 The animation mini tab is divided into two components animation control and video streaming control Animation control Stop Pause Play The animation control consists of the Play Stop and Pause buttons These buttons dynamically control the animation movement Effect of animation or moving the animation slider is as demonstrated in figure shown Simulation Time 0 5 sec Simulation Time 1 5 sec gt SS y Simulation Time 2 5 sec r y f FS 2 i i iE 11 gt y A y A N p v Page 85 Video streaming control To save animation to avi file format enable the video streaming by checking the Save Animation to avi checkbox You can also assign the folder to save the avi by clicking the cana button and assigning the filename in the dialog box that appears Page 86 Graph Plot tab Introduction Display Graph Plot Report Streamlines Profile Graph Activate Plotter X Line Y Line Z Line Position Transient Graph Activate Plotter Position Plot Graph The Graph Plot tab in VRView contains two type of graph that can be generated Profile graph and Transient graph The prof
32. igure The window tabs are divided into six sections General Flow Model Initial Condition Matrix setup Relaxation Factor setup and Minimum Maximum Limits Each section describes advanced parameters that can be set up by user The diagram below shows a general structure of the feature Page 56 Advanced Setup Initial Relaxation ine General Flow Model es Matrix setup e Limit setup Fluid Property Transient setup ood ibn Method Cond Pressure Flow Model Temperature Inner Iteration Init Cond IAQ Input Parameter Linearization model Buoyancy Model General tab The general tab contains the Fluid Property and the IAQ Input Parameter setup fields Advanced Solver Setup Relasation Lirit Fluid Property Density 116 kgm 3 Specific Heat Cp 1005 J kgk Dynamic Viscosity p 1 7815E 05 Nostm 2 Prandtl Number PT 0 707 Input Parameters Clothing Thermal Resistance A aoth med Kv Metabolic Rate Ameta 3 wal fon External Work Accomplished Ma Partial Pressure of Yapour in Air Py Pa Page 57 Fluid Property The Fluid Property section list out the fluid properties that could be changed by the user The default values are set for fluid of Air at standard condition of 25 C Fluid Property Density p 1 16 kg m 3 Specific Heat Cp 1005 J kok Dynamic Viscosity p 1 7815E 05 M s m 2 Prandtl Number Pr 0 707 IAQ Input Param
33. ile graph is used when the profile of the variables values over a line segment is desired The line segment can be set to be parallel to any of the x y z principle axis at one time The position of the line is set according to the I J K mesh position The transient graph can be used when the change of values at a point of interest over time time step is desired It describes the transient behavior of speed pressure temperature over time Especially useful in predicting the variable behavior over time e g checking if temperature variance will exceed the design criteria for outdoor units Page 87 Profile graph Profile Graph Activate Plotter X Line Y Line Z Line Position Plot Graph To plot a profile graph activate the plotter by checking the lv Activate Plotter checkbox A line will be viewed in the main viewer Move the line a bit for clearer view by changing the position value The position is blanked according to the current line orientation Line O Y Line Line The figure shows different orientation effect of the line chosen for a pre defined position Page 88 Click the Plot Graph button to generate the graph plot Example a 3 Chord Langt Transient graph Transient Graph Activate Plotter Position Plot Graph To plot a profile graph activate the plotter by checking the lv Activate Plotter checkbox A hair line will be viewed in the main viewer Mo
34. imulation running from 1 to 300 iterations simply change the mode to Continue and just add another 200 iteration to the existing one Thus there is no need to repeat the first initial 1 to 100 iterations to obtain a continual of the simulation Heat transfer Model Turn on this option if the heat transfer temperature distribution of the fluid is to be simulated together with the fluid flow Buoyancy Model Turn on the option if the buoyancy behavior hotter fluid rise colder fluid sinks phenomena is to be simulated together with the fluid flow The reference temperature in this section refers to the set ambient temperature Example 35 degree Celcius ambient air temperature during noon time in Malaysia IAQ Model Turn on this option if the Indoor Air Quality IAQ parameters are to be calculated The result will be displayed in terms of distribution of scalar parameters such as Draught Risk in percentage Draft Temperature Predicted Percentage Dissatisfied PPD and Predicted Mean Vote PMV Iteration setup The iteration setup has two main parameters criteria They are the number of iteration and the convergence criteria parameters The number of iteration is termed differently in steady and unsteady mode In transient state simulation it is termed as Maximum Iteration per time step which represents the maximum iteration that can be reached for each time step Optimal value is around 100 iteratio
35. l T No Spaci H Change Company logo here y E Simulation Result Date 12 9 2008 PROJECT VRSim simulation CLIENT Consultant name PREPARED BY my Company International DESCRIPTION Resultant Velocity Page 100 Streamlines Introduction Display Graph Plot Report Streamlines Streamline density 20 O Animate Show Streamline X coord o Y coord o coord o qe Add The streamline tab is a tab where the streamline can be generated and viewed from It could be viewed in static form or in animation form A hairline Shown in figure is used to indicate the position of seed point where the streamline passing through the point is calculated Page 101 Streamline operations Show Hide streamline Show Streamline To show or hide the streamline check uncheck the checkbox in the streamline tab Position Coordinate of streamline The coordinate of the hairline where the streamline is passing through the point can be set up in the coordinate fields coord Q Y coord U Z coordi U The hairline will move accordingly as the coordinate value changes Adding streamline o C Show Streamline To add a streamline in the view ensure the checkbox in the streamline tab is checked A hairline gt can be viewed indicating the point where the generated streamline will pass through Set the coordinate of the seed point in the coordinate fields Page 102 x
36. lue 100 Total_ time 100 x 0 1 10s The time step sequence becomes Os 0 1s 0 2s 0 3s 9 9s 10s Save result at every Definition The parameter is a control for the solver to save the simulation result file at every specified time step level For example using the default value of 5 for the parameter will give a sequence of Time step s 0 1s 0 2s 0 3s 0 4s 0 5s 9 9s 10s Time step Number 1 2 3 44 5 saved 99 100 saved Thus the final animated result sequence seen in the post processor VRView is Time step s 0 5s 1 0s 1 5s 2 0s 9 5s 10 0s Page 26 Running the Simulation Simulation Start End File View Tools Shape Library VRView Help Browse For Folder Save result in a specified folder Desktop My Documents 3 Mw Computer a My Network Places e Recycle Bin 5 55 Records O Acson Installer 5 bamboo blade 9 claymore O Constructive solid geometry 9 csgl 1 4 0 dl 3 Delaunay Triangulation 9 Fun videos w Make Mew Folder i The solver engine will start and shows the convergence plot simulation messages Page 27 At the end of the simulation a pop up window will appear ViRSim_Solver Program Terminated with exit code O Exit Window A pop up window will appear after the simulation has been completed Click Yes to exit the solver mode If you clicked No simply close the window of the solver mode to obtain your resul
37. m It acts as interpreter and converter from representation New Folder 2 F Edit view Favorit vol H O 5 yo Search E Folders ER the text only representation to graphic Seg Ar Address G C Documents and Settings anuar DesktoplNew Folder 2 v Ho e AREA dat GeomData dat File and Folder Tasks Coil Document Coil Document 1 KB 1KB g3 Make a new folder Publish this Folder to the GRID dat Restart dat Web Coil Document Coil Document EZ Share this Folder 224 KB gr 233 KB RESULT DAT WMESH dat Coil Document Coil Document CO O 197 KB 99 KB ns O lt U 2ZA anr z 2 0 gt 100 gt hg0 gt 30 gt 0 gt File Edit Format Yiew Help tas co4tA y01 q0 BLOCK EXPOSED AREACMA2 7 0 gt 75 HQ ORIENTATION EXPOSED AREACMA2 Glos Ady 2 0 25000000E 00 I 0 25000000E 00 1 0 25000000E 00 EXPOSED AREA mMA2 0 40999951E 01 04 9 4 4P4 gt log 7 5T 4 1 SEA Y oTILIGI F l 1 pun U Oy pk D lt CE lt g lt I lt 1 1k 54 004 AB door od A LA pc 0 PA pia pre X CENTER Cm 0 60000000E 01 0 OOOOO000E 00 0 OOOOO000E 00 I I I y VRView post processing Conversion from text to graphics representation Page 67 VRView as a post processor The term post processor in VRView is referring to the nature of the software to process the solution data that is produced by the solver in VRSim A typical simulation follows from simulation to sol
38. mal Setup Enclosure BC Thermal Setup BCs Opening Components Type Thermal Setup Velocity Opening BC setup Diffuser Mode Spec Flowrate Spec Pressure Thermal Setup Thermal setup sets the thermal condition of the blocks opening or enclosure wall of domain Specified Heat Load The default setting of Specified Heat Load condition with zero value sets the blocks as pure blockade with no heat source and opening as pure opening with no cooling or heating effect through it lf the heat load applied across the opening block or enclosure wall surface is constant known set the thermal setup to this option Specify the value in the field provided Page 20 Specified Temperature lf the temperature applied across the opening block or enclosure wall surface is constant known set the thermal setup to this option Specify the value in the field provided Opening Types Inlet Choose this type of opening if the opening is acting as an inlet Only the thermal setup flow setup velocity diffuser mode and suctionID feature is enabled for this option Outlet Pressure Choose this type of opening if the opening is acting as an outlet with known fixed pressure Only the pressure field is enabled for this option Thin Solid Choose this type of opening if the opening is modeling objects such as glass pane closed window Only the thermal setup is enabled for this type of opening Atmos
39. mlines El Report Details Project YRSim simulation Client Consultant name Prepared by Company namel Description The report tab mainly consists of the image capture feature image pane and the report template The image pane is where the image can be temporarily stored in the VRView software There are options of saving the image as image files in a specified folder or adding the image to the report template The report template prepares a report template format for reporting the result to the customers The captured images is automatically added to the report template including the company logo and general particulars of the simulation result Page 93 Image pane Adding image To add an image to the image pane right click to view the pop up menu of the image pane Display Graph Plot Report Streamlines Add image Click the option and the image will be saved to the pane Page 94 Display Graph Plot Report Streamlines Browsing image To browse through the image that have been captured simply click the numericUpDown button indicated in figure Display Graph Plot Report Streamlines Display Graph Plot Report NumericUpDown TFA vero button Page 95 Deleting image To delete an image from the image pane right click to view the pop up menu of the image pane Display Graph Plot Re
40. nd color is changed accordingly Page 46 fio ew ok Shape Lisa es Simulation Shape Library hw To change the background color through the menu strip click View gt Color setup gt Background option and a color dialog will appear Choose the desired color and click OK The atmosphere background color is changed accordingly Wall Color To change the Wall color through the View panel go to the View panel click the access button and a color dialog will appear Basic colors CIN NN H N OTTO Custom colors i ip ip ip pp a i ip ip ip pp a Define Custom Colors gt gt Page 47 Choose the desired color and click OK The wall color is changed accordingly To change the background color through the menu strip click View gt Color setup gt Wall option and a color dialog will appear Choose the desired color and click OK The wall color is changed accordingly Floor Color To change the Floor color through the View panel go to the View panel click the access button and a color dialog will appear Page 48 Basic colors _ Custom colors E U U g Eee A A NA MN ee Choose the desired color and click OK The floor color is changed accordingly To change the background color through the menu strip click View gt Color setup gt Floor option and a color dialog will appear Choose the desired color and click
41. nd later rectangular objects blockades can be inserted to form the desired domain A L shaped domain Setting the Domain Geometry To set the size of the domain geometry click the access button and the Flow Domain Settings window will appear Page 8 Flow Domain Settings Domain Dimension Width meter Length r meter Height z meter The dimension of the domain then can be set according to width along the X axis length along the Y axis and height along the Z axis dimension Object Geometry Setup The object geometry refers to the blockade and opening components that can be set inside the domain It represents real life object such as chairs sofa bed table human body etc in the geometry model The object geometry is divided into two types which are the Custom type and the ShapeLib type The custom type is further broken into either block or opening It is useful to represent geometries which are specific to a particular case such as atmospheric openings on the domain wall or pillars to a specific size in a hotel lobby The ShapeLib type is a unique geometry type where an object is represented by a collection combination of block opening and virtual block opening It shows geometry that are already built in the Shape Library Editor and shown as a single entity in the ObjectBrowser window lts usage is for common shapes which will be used repeatedly in other cases Examples of ShapeLib obje
42. ns Page 24 In a steady state simulation it is termed as Maximum iteration as there is only one single time step in a steady state simulation Optimal value is around 300 to about 1000 iterations depending on the complexity of the model For further example on steady state and transient simulation see Advanced Solver Setup section The convergence criterion is the largest error level that needs to be achieved for the solution to be considered as converged SolverSetup Simulation Mode 2 New simulation Continue Simulation Models Simulate Heat Transfer Simulate Buoyancy Toref 27 00 deg Celcius C Simulate 14 0 lteration Setup Masinnurn beration 100 E Convergence Criteria 0 001 9 For each time step if one of the two criteria is already met the simulation will stop and jump to the next time step Page 25 Transient parameters The transient parameters control the time step sequence for the transient simulation Time step size Definition It is the time step difference for each time step Example Time step size with a value of 0 1 will produce time sequence Os 0 1s 0 2s 0 3s Number of time step Definition Contributes to the total number of time step applied for the solver In a relationship this gives Total_time Number_of_time_step x Time_step_ size For example given a simulation with Number of time step of va
43. ons where you might need to use VRSim i New design validation This is when the results are used to support project proposals to the customer or if uncertain how the design will affect the air flow and heat transfer phenomena it Troubleshooting old design Page 6 This is when there are problems with the previous design and it is desired to understand why the failure of the design occurs 111 For gaining customer trust Using scientific approach benefits in gaining customer trust on user professionalism and work quality Geometry setup How to use the software A tutorial has been provided with the software to initially introduce the basic interface in VRSim Then a series of step by step tutorials on how to setup the simulation and analyze the result is presented based on the user level This user manual adds further explanation on the mechanics of the VRSim software to complement the tutorial guide Page 7 Geometry Setup Introduction The geometry setup is divided into two main parts Domain Geometry setup and Object Geometry setup Domain Geometry Setup The Domain geometry refers to the overall domain that defines the limits of the computational boundary of the solver For example if you are simulating a flow ina rectangular closed room the domain is the walls of the room For cases of domain with irregular shape such as an L shaped domain it can be build by first defining a rectangular domain a
44. pheric Boundary Choose this type of opening to represent atmospheric boundary where the direction of the flow is principally unknown or not constant Outlet Mass flow Choose this type of opening to represent outlet with constant mass flowrate Only the mass flow rate field is enabled in this option Velocity setup Flow rate The flow rate of the openings in CFM Cubic Feet per Minute can be set to represent the velocity of the fluid Specifying Angle Page 21 The velocity vector angle is specified based on the reference to the principal axis X Y Z axis This is illustrated in the figure below Only two angle needs to be supplied by the user For example if the opening is lying on the XY plane the angle of the vector to the principal z axis is blanked and resolved by VRSim The proper direction will be set by VRSim based on the type of the opening This is to reduce ambiguity and input error by user Diffuser mode Enable the diffuser checkbox to specify inlet openings which have a diffusing flow pattern The diffusing pattern is specified in central radial fashion with a specified diffusing angle The specified diffusing angle is measured as shown in the figure below Inlet opening WN db Diffusing angle Specified flow rate Specify the fixed flow rate value in this field Applicable only to Outlet Mass flow opening type Specified pressure Specify the fixed pressure value in this field This is appli
45. port Image Click the p vettemage option and the image will be deleted from the pane Page 96 Display Graph Plot Report Image Save image to folder To save the image as image files to a folder click the Image gt Save Image option in the menu strip Display Graph Plot Report it Specify the folder which the image files are to be saved into Page 97 Browse For Folder Picture path directory Desktop El My Documents H My Computer i uJ My Network Places El Recycle Bin 5 55 Records 5 Acson Installer 5 bamboo blade O claymore O Constructive solid geometry E 5 esal 1 4 0 dl 9 Delaunay Triangulation 5 Fun videos hal Make New Folder Report details Report Details Project VRSim simulation Client Cons ultant name Prepared by Company namel Description Item Description_ Page 98 Create a report file Viewing template file To view the template file click the button in the Report tab A sample report in rich text format can be viewed Date 12 9 2 WRSim simulation Consultant name my Company International Resultant Velocity 08 00090 To save the report click the save report toolbar button and save the file Open the created report file in Microsoft Office Word The spacing and arrangements of the report is optimized for this format Page 99 aaBbceDc AaBbccoc AaBbC A T Norma
46. ption mini tab Display Graph Plot Report Streamlines Variables View Option Animation Room Yiew Room WireFrame Room Floor cale Legend Object WireFrame Block Solid Openings Solid The Option mini tab contains display visibility option using checkbox control For easy recognition it is grouped into two parts Room View and Object View The features for each group are listed out as below Room View features Room Wireframe Shows the wireframe view for roomidomain when checked Turn on if the computational domain limit is to be viewed Usually turned off if the wireframe obstructs the inner view Shows the floor of the room domain when checked Shows the scale lines when checked Turn on the feature when rough distance guidance is needed This is especially useful for setting the streamline seed coordinate Shows the legend when checked Page 83 Object View features Object wireframe Shows the Object wireframe when checked Opening solid Shows the Opening solid rendering when checked Block solid Shows the Block solid rendering when checked Animation mini tab Display Graph Plot Report Streamlines Variables View Option Animation jm Save Animation to Awi Directory LI rn nrar Era AO rn Wiki ows Program Files ARome OLMovie The animation display is only activated when transient solution is loaded onto the VRV
47. rm in the Navier Stokes Equation NSE There are three types of linearization scheme available Linearization Model EE Linearization Technique type Type 3 bil Testing shows that little difference in accuracy is apparent in the choice of linearization used The default Type 3 is proposed however as it shows most stability over the other two type of linearization The linearization options are only applicable for the case where standard K epsilon or RNG K epsilon turbulence model is used Buoyancy model The buoyancy model is activated when the buoyancy behavior of fluid hot fluid rise cold fluid sinks is to be simulated The model is also known as Boussinesq approximation model for buoyancy driven flow Bouyancy Model Thermal expansion coett 0 003 Gravity in Z direction g te Stratification Check the Stratification checkbox if the stratification layering effect is to be modeled also in the buoyancy driven flow Page 63 Initial Condition tab An initial condition provides the solver a starting value for guessing the solution of the simulation The nearer the guess to the real solution the faster the solution will achieve convergence Fill up the field with a suitable guess value usually the final expected value to achieve better convergence rate Advanced Solver Setup Velocity Initial Conditions velocity velocity Vvelocity Pressure Pressure Initial Conditions
48. rtual Room Viewer Autoloader Ctrl L Load Files Ctrl F A Load File window will be viewed Load File Geometry Data Mesh Data AN Result Data Click the button to load the GeomData dat file Click the button to load the VIEVWMESH dat file Click the button to load the RESULT DAT solution file for steady state solution or the multiple RESULT DAT solution file for unsteady transient solution The loaded window will be viewed as shown Page 73 Load File Geometry Data C Documents and SettingsanuarsDesktopsk 14 projects Trial 1 Gec Mesh Data LC Documents and Settingsanuar Desktop ETA project Trial 14V1E Result Data C Documents and Settings anuarsDesktopsE 74 project nal ARES This is the original method of loading the file It allows for more control in loading the result files Page 74 Display tab Introduction Display Graph Plot Report Streamlines Variables View Option Animation Speed m s X velocity m s The display tab in VRView contains four 4 mini tabs Variables View Option and Animation mini tab These mini tabs contain other features associated with display of the loaded simulation result model The functions of the mini tabs are summarized in the figure shown e Set the current view options contour line vector plot etc e List and set the variables currently plotted
49. s to be considered for Modes the flat contour smooth contour and contour lines Global mode Global mode considers the maximum minimum range of the whole domain It is used when the overall comparison of the value is to be considered In this mode only a single Global legend is to be shown Page 79 Global 070 Local mode Global mode considers the maximum minimum range only on the range of the cutting plane It is used when the comparison of the value is made only for a particular plane In this mode the legend of each cutting plane is to be shown if available Flat Contour This view is also known as filled contour Typically the nicest view for evaluating the contour field Page 80 Smooth Contour Velocity Vector is less differentiation Similar to Flat Contour but there between the contour regions Usually faster to render than flat contour Used to give an overall understanding on the contour field Shows the distribution of vector field s direction in the result The color is of the vector heads are marked according to the current variable chosen Resultant Velocity 19 The Vector Scaling Factor controls the size of the vector head displayed Maximum size is set at 10 units Page 81 Line Contour Domain 5 m x 5 m x 4 m The mesh shows the basis vertex connectivity which the solution data is based from Page 82 O
50. t and Speeding up the design to production time cycle Role of VRSim software VRSim is useful when the air flow pattern and the heat transfer of the indoor condition or outdoor conditions need to be studied The prediction can be used to optimize design or to simply detect potential trouble areas and troubleshoot existing configuration For example to install outdoor units with irregular configuration in a hot and humid tropical country such as Malaysia or Singapore there is a risk that the units may get overheated Where analytical and experimental solution is time consuming and costly VRSim can be used to predict the flow pattern and heat transfer behavior of the air as the unit is running in extreme conditions With VRSim the analysis can be done with virtually no additional cost and using less time In short VRSim project emulates the concept of CFD in reducing cost and shortening analysis time for design applications Who should use the software HVAC engineers VRSim is in fact customized CFD software VRSim is made specifically for applied HVAC engineers in minds While the learning curve of the software is simple enough so that it can be understood and operated by any layman it still needs actual design engineers to analyze the software simulation results This differentiates the VRSim as a product which is made for engineers to a software product made for the ordinary layman Where VRSim applies There are three common situati
51. t files Terminating simulation STO To terminate the solver calculation click the access button Wait for the simulation to finish its last time step iterations This may take a few minutes lf the simulation is to be terminated without the saving the last time step result simply close the solver window that contains the simulation residual plot etc Page 28 Shape Library Editor Introduction To access the Shape_Library_Editor mode go to Shape Library tab and click the The local principle X Y Z axis is displayed as a reference shown in blue red and green The reference coordinate for rotation and translation is always fixed to be at the origin coordinate lt 0 0 O gt of the displayed axis Group and Object tree structure and operations The display shows the database tree on the right side panel of the interface The database tree is a tree which represents the list of Group and its child objects The objects consist of three components which are the blocks virtual block and openings Each of these components has geometry parameters of size width length height and Page 29 position x y z coordinate At the same time the components also have its corresponding Boundary Condition parameters except Virtual Block A sample on the tree structure is as shown in figure Boundary Condition Adding new group object To add a new group to the tree list click on any of the existing group and
52. the Custom Object tab and click the e button Custom Object Library Object Custom Slee com CO a Heal dm B ies Change the color to the desired color in the color dialog Basic colors i PO N rt ok Lt Tr gt BEE H Custom colors BEBE Hm BEE EE HH NOTE Dimension edit and color edit is only applicable for Custom type object Page 15 Mesh Introduction Loosely mesh is referring to the result of the process of breaking up a physical domain into smaller sub domains This process is also termed as meshing process discretization from the word discrete and grid generation The code which generates the mesh computationally is called grid generator or mesher VRSim is using a fully automated mesh generator with user defined input The type of mesh in used is a axis aligned Cartesian mesh type This type of mesh has the advantage of fast generation robust and orthogonal cell faces It also contributes to high accuracy result The user inputs for the mesher are the minimum number of cells bias factor and minimum gap spacing Number of Cell The number of cells refers to the number of cells in each axis direction X Y Z However the mesher just uses the number as a guideline The final number of cells generated may differ from what is inputted by the user This is indicated on the top of the window as shown MesherControl 23 22 14 hara Piar f AT Page 16 Bias Fac
53. the file is saved accordingly by the user Page 43 Environment Introduction VRSim allows the user to customize and change certain feature of its main display Main View display These features are the color transparency level scale and View Pane mode toggle VRS Virtual Room Simulator File View Tools Shape Library VRView Help Simulation Shape Library View Main View display region There are two way to access the environment control The firs method is to directly go to the View panel control Library WRView Help Simulation Shape Library View The second method is to use the menu strip menu View gt Page 44 Main View mouselkeyboard control Figure shows functions that can be used to control the Main View view using a mouse A mouse without the middle mouse button can use Ctrl RightMouseButtor to Zoom in and out The pre defined view could be viewed by stroking the keyboard key as listed in table F Toggle to Front view Page 45 B Toggle to Back view R Toggle to Right view L Toggle to Left view T Toggle to Top view Ctrl B Toggle to Bottom view D Toggle to Default view Background Atmosphere Color To change the background color through the View panel go to the View panel click the access button and a color dialog will appear Detine Custom Colors gt gt Cancel Choose the desired color and click OK The atmosphere backgrou
54. tor The bias factor controls how the nodes of the cells are to be clustered Bias factor of 1 00 indicates an evenly spaced cell size Values other than 1 00 will stretch the distribution of the nodes along the X Y Z axis Minimum gap spacing When a small gap is detected in the geometry this option sets the minimum number of nodes to be inserted in such gap Generating mesh To set the mesh properties click the window will appear Number of Cells Hedirection y direction z direction Bias Factor Minimum Gap Spacing Set the mesh property accordingly and click the Apply button The Mesher window mode changes to the display mode with the result mesh shown in the model viewer Page 17 MesberControl 231271 14 ER SS a ae eS j 24 DO A A e Y AY ENANA Apo y NY 4 a a 6 i Y Wy 7 h N n Y e A Y Y y W i Y YY ae i Mi Ms i w X 0 W n X PA A O Y W O X y x IN O Y X OY oe AX AY Moving the Mesh Plane slider control will accordingly move the mesh plane in the model viewer Warning display The mesher will occasionally display warning messages to indicate low quality mesh generated in the model While is not necessary to have zero warning error message in a particular mesh result too many warning indicates severe geometr
55. ture Furniture Furniture Furniture Furniture Furniture Furniture Furniture Furniture Furniture R22 Coolir CE25D H Furniture 1 16 1005 1 78E 05 0 707 Transient RNGKE YES YES 200 0 001 300 Name Orientation X PositiorY PositiorZ Position Staircase Back Table Chair Chair Chair Chair Chair Chair Chair Chair Chair Table window window New Simulation M4 gt Main Custom objects Front Front Front Front Front Back Back Back Back Front Back Front Front Front Front Shape_Library objects Mesh Parameters I 0 2 4 b d N0110040000000000 gt Advanced solver setup To access the Advanced Solver setup option simply click the Tools gt Advanced Solver setup option in the menu strip Page 55 YRS Virtual Room Simulator Fie View Shape Library VWRiview Help Create Simulation Report Advanced Solver Setup Advanced Solver Setup Flow Model Init Condition Matrix Relaxation Limit Transient Setup Time Dependence Steady e Steady ANG E epeilon e La 0 0845 Flow Model Cl 1 G C2 l Turbulent Prandtl Humber Linearization Model RE Linearization Technique type i la a En uyancy Model Thermal expansion coeff LL T Stratiticabor The Advanced Solver setup window could be viewed as shown in the f
56. ty Increase the value if the convergence is stable steady but very slow to converge decrease the value if the convergence is not stable steady The default values are determined to be most optimal over a large range of cases Page 65 The pressure correction factor is also included in the list of parameters Limits tab Advanced Solver Setup General Flow Model Init Condition Matrix Linear Relaxation Factor velocity velocity velocity Turbulent Kinetic Energy Dissipation Rate Pressure Pressure Correction Temperature 050 4 030 2 050 A 100 E 0 80 A i Relaxation Limit The limit tab puts a limit on the value of the solution to detect if the solution has already diverges Very large value has been set for maximum value and very small value has been set for minimum value This feature is rarely modified if any Advanced Solver Setup General Flow Model Init Condition Solution Limita velocity velocity velocity Turbulent Kinetic Energy Dissipation Rate Pressure Temperature Turb viscosity ratio C1 Matris Relaxation Limit lt Minimum gt 1E 20 1E 20 1E 20 Maximum gt 1E 20 1E 20 1E 20 Page 66 Introduction to VRView Virtual Room Viewer VRView Virtual Room Viewer VRView is software used to view air flow movement and heat transfer in meaningful presentation from a set of result data obtained from VRSi
57. ution to post processor Result Solution in post processor Simulation converts to 3D and 4D contour vectors etc The solution typically comes in the form of 3D and 4D mesh structure scalar value This post result needs to be processed into easy graphical form such as vector field or a contour plot over certain plane cut In this way user will see less numbers and focus more on comparison and data analysis Page 68 Vector Animation Streamline Graph plot VRView Contour Mesh graphic A task specific software VRView is unique from other post processor in a few aspects It offers a few advantages over the general commercial post processor As VRView is made exactly for our own specific usage in the HVAC industry the user interface has been designed to contain the most relevant task Variable change is made to be fast Function that is used more frequently than others e g report feature is prioritized over the less common function e g streamline feature These factors are considered to offer fast and hassle free software usage for user experience In comparison the general purpose post processor software needs longer initial setup time and is bulky with unneeded features Also commercial software is usually expensive and most of the time not easy to learn Another additional advantage of VRView is that as the software is developed in house thus the low cost factor there is always room
58. ve the hair line a bit for clearer view by changing the position value It indicates the point which the point of interest is to be plotted The figure shows the hair line Page 89 Click the Plot Graph button to generate the graph plot Example Transient Plot of V_r m s Versus Time sec E Time in seconds Page 90 Saving plotted graph Save As Image To save the plotted graph as an image file right click on the graph window Resultant Velocity at J 9 K 6 for X line Save Image As Page Setup Print Show Point Yalues Set Scale to Default Chord Length Click the option from the pop up menu Specify the image file name and location There are a few choices on the image format that is available e g tiff png bmp emf Save As File To save the plotted graph as a zedGraph file click the File gt Save graph option in the menu strip The file as zedGraph file from the Save up dialog that appears Page 91 Chord Langt VRViewVer2 0 E Your plot File has been saved For each successful save operation a appear dialog will To open the file later simply double click on the file and the plot will be opened ES ZedGrahp Viewer Resultant Velocity at J 9 K 6 for X line Chord Length This operation does not require the VRView software to be activated beforehand Page 92 Report tab Introduction Display Graph Plot Report Strea
59. wa camseas a evanede stn cueeeeainedeaaaaeeceemmencs 24 PRS 50g 15 Sy 2a omen eee Pr oa dan ieaoruaisa 24 TRANSIENTP ARA METERS tes a tnc dace a a obec based dewasenade a dai 26 RUNNING THE SIMULATION scan id 27 SIMULATION STARINE ND darias 27 TERMINA NNG SIMULATION urna 28 SHAPE LIBRARY EDITOR incuna a E ee 29 INTRODUCTION Ii a ea ents 29 GROUP AND OBJECT TREE STRUCTURE AND OPERATIONG sccsccsccescesccacceucceecesccsecesccseceseeseeeuceseceeceeceecseeeeeeeaes 29 AGGING new oroup objet ornan AS AAA A 30 DELETING GIOUD OD CAS A AS 31 COPV ONG Da Ste ODE Ea ir o ii tit ences 31 DUPUCANO o OLOUD AAA A AA AAA AS ii 34 GEOMETRY ETUR datos 35 Adno a COMPONEN ranoni A A A R 36 Deleting a Componente ico A A 37 BOUNDARY CONDITION SETUP aga 37 IMPORT S EXPORT DATABASE FILE cit aaa 39 EXPO CLOUD EME ica 39 Import Update databas eNO lE nroa E AEE aaeaaes ee aes 42 PERSISTENT MODE so tddi econ 43 ENVIRONMENT lt a ic iodo acoso 44 INTRODUCE 44 MAIN VIEW MOUSE KEYBOARD CONTROL tonta ata aia 45 BACKGROUND ATMOSPHERE COLOR uruna ihee el a 46 WAL COLOR tc dSaveeniutsniects e o A A haauone dae 47 o O nate sie ue des 48 TRANSPARENCY VIEW OPTION riran a ircatev ential ad 50 SCARE DIPA anane a a igete Lupita etapa icine eaean Gece temiceeade aeeaeateo eens 51 VIEW PANE MODE saveiro anclas 52 ADVANCED TOO ES Aa 54 REPORTING SIMULATION SETUP adi ds 54 ADVANCED SOLVER SETUP eds 55 Generol TADA A AA A iia 57 PUIG POD A N A A 58 PACH TA
60. y misplacement MesherControl 48 x 58 x 36 Humber of Cells Mesh Hane Hedirection y direction z direction Yul ai Bias Factor EN al Minimum Gap Spacing ce 5 Warning CAUTION Small gap at z 2 7260m with gap size 0 0140m fournd Fill the gap by repositioning the object OR Increase the A of cells in direction WR Sim ese 1 warninal Page 18 Boundary Conditions Setup Introduction The boundary condition can be viewed by clicking the BCs window will appear Obstacle BC Opening EC Enclosure BC Opening Type Opening Name Thermal Setup Atmospheric Boundary inflow SuctionlD Atmospheric Boundary 2 Heat Load 3 Temperature Heat Load q o deg Celcius Flow velocity Setup Velocity Flow Aate mal an P y a deg by deg b so deg Diffuser Mode Angle deg Pressure P Spec Flow rate as crn 0 Pe RESET APPLY There are three BCs tab components that can be set by user They are the Obstacle BC for custom Block BC Opening BC for custom Opening BC and Enclosure BC for wall enclosure of domain BC Page 19 For all of the components the thermal setup can be set by user However the openings have extra parameters that will be enabled according to the opening type being set by user Summary on the structure of BC setup is shown here Blockade BC es Ther
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