DeViSoRGrid 2 User's Manual
Contents
1. Additionally you can configure the sensitivity of mouse based input via the snap and tolerance settings The global epsilon controls the accuraccy of internal calculations for example for making boundaries continuous COLOR OPTIONS Here you can assign colors to anything drawable on the drawing area ACCELERATORS For your convenience you can assign keyboard accelerators to any operation ini tiated via the toolbar of the main menu MISC We implemented a dynamic change of the look and feel of the application so if you don t like the built in Java look and feel chance it to Windows or Motif or whatever look and feel supported by your system However we recommend the Java look and feel because the GUI has been optimised for it 2 BEFORE YOU START 4 After that you will have to save your default options file to disk Using Linux or Solaris save your options to a file called devisorgrid in your home directory Under Windows save your options to a file called devisorgrid conf in your home directory A little example Using W2K your home directory is located on drive C in the directory called Dokumente und Einstellungen username The startup options configuration The DeViSoR has built in support for various configurations In the Options Dialog you can save as many of your configurations as you want For example you might want to use different draw options when defining geometry and grids Just save the two different configurations and2. 2 Setting up your DeViSoR installation As there are a lot of options you can set in the DeViSoR it is now neccessary to configure your installation Run the application by launching the startup class devisorgrid class in other words just type java devisorgrid in the directory you installed the DeViSoR to It is essential that you start the DeViSoR from that directory for the options managing class being loaded correctly For your convenience under Windows just start the batch script called devisorgrid bat Once the DeViSoR is up you can ignore all error messages about missing helpfiles etc go directly to the Options Dialog by selecting the General Options entry from the menu A dialog will appear and you will have to set the DEVISORHOME path to the directory you just installed the DeViSoR to This is extremly neccessary because all paths used in the DeViSoR are set relative to that path You can flip through the other tab sheets of the dialog for a brief glance most options are pretty self explanatory DRAW OPTIONS Here you can pick whatever should be drawn Sometimes it might be useful not to draw the numbering for example if you have many small boundary segments So just turn off or on whatever you want For a full explanation see the geometry and grid definition chapters in the manual If your machine seems to be a bit slow for the DeViSoR just turn off the option toggling the display of the user coordinates at the mouse position
3. against which mirroring will be performed Otherwise the DeViSoR switches to Mirror Mode and you can draw the line on the drawing area by mouse 3 5 Copy and Paste The DeViSoR supports full Copy and Paste You can select any element on the drawing area by just dragging a rubber band around them with the mouse if you prefer the term call this throwing a lasso You can choose which type of item is selectable with the four Select Mask buttons in the toolbar or the Edit menu any combination of the four types Nodes Edges Elements and Segments can be made 3 BASIC PROGRAM INTERACTION 7 selectable Copy and paste for nodes edges and elements is easy full clones are created Note that when selecting an element its nodes are implicitly selected as well For segments things are a bit more complicated There are two Paste Modes KEEPSTRUCTURE and APPEND In KEEPSTRUCTURE mode all segments are inserted into new boundaries in APPEND mode they are appended at the end of the current working boundary See the geometry definition chapter for more details You can switch between these two modes via the Edit menu or the corresponding button in the toolbar We are awfully sorry but we have to admit that there is a known bug in the pasting mechanism When pasting boundary nodes it might sometimes happen that the boundary node at parameter value 0 for closed segments will not be pasted at all but instead an error message will show up As a workaro
4. element types e The nodes of an element must have counterclockwise orientation e Elements should not be degenerated No extremal inner angles should occur and large aspect ratios should be avoided e Neighbouring elements should not differ much in size e Generally place most nodes where you expect interesting things to happen e It is always a good test to start a TriGen run on the mesh you created If it does not crash this indicates you created a feasible grid 6 ADDITIONAL FEAT FEATURES 15 6 Additional FEAT features 6 1 Property queries For your convenience we added a property query mode In this mode to be activated through the Edit menu or the toolbar a click on an item on the drawing area will show a dialog displaying all parameters of the item While you are at it you can directly alter these parameters Example If you are not entirely satisfied with the position of a boundary node just switch on property query mode click on the node and change its parameter value to something more satisfying 6 2 Automated refinement If you have a working FEATFLOW installation you can link the TriGen2D tool to the DeViSoR using the corresponding dialog See the manual for details about the TriGen tool You have to give the path to your Trigend2D installation in the options dialog in the general section Further you have to copy the feat2tri f and trigen wrapper files to your trigen2d directory Before using you have to compile the
5. 00 ee ee 6 3 Fixing parametrisation 2 ee Additional FEAST features A Licence Agreement References ww w NINN N OOD gama a a 1 FOREWORD 2 1 Foreword What is DeViSoRGrid DeViSoR is abbreviated for Design and Visualisation Software Resource The DeViSoRGrid application is part of that software family and is primarily used for the following tasks so far in 2D only e geometry generation e manual coarse mesh definition e grid visualisation at all levels All of this can be done in a very comfortable manner using a simple point and click interface like in common vector based image processing software Both the reliable FEAT file format and the new FEAST format with integrated parallelism are supported Supported platforms Due to its pure Java implementation the DeViSoR should technically run on any platform with installed JDK 1 4 This JDK is the minimum because for performance reasons we made extensive use of the Java2D API which comes stable and with reasonable performance only from this Java version onwards We have successfully tested the DeViSoR on Solaris PCs running SuSE Linux 7 x the main target platform and Windows PCs However we strongly recommend using Linux based machines for the GUI looks best on these machines Due to some Java bugs which we did not find the cure for we definitely recommend using JDK 1 4 whenever possible or some of the dialog based operations will cause the application to crash randomly
6. DeViSoRGrid 2 User s Manual Christian Becker Dominik G ddeke Special FEAT version for the FEATFLOW Springschool 2002 Contents 1 Foreword 2 Before you start 21 Installation 3 64 oo 20 2A A REM MEAIB eS EEE DAA DGS 2 2 Setting up your DeViSoR installation o o 0 o Basic program interaction 31 Generali rana do a p a a a da a 3 2 Loading and Saving Avie eee ges eo A a Se bela 3 3 Drawing scare e doere A A RN A e ee ee A 3 4 Translating Scaling Rotating and Mirroring e dio Copyeand Basterds Stele Fy a ete A ate etal Ne teat eats AOR ORIN oY oe ks alada 3 6 Printin s 4 ty wok al oA Ae i ae ee ee a ee Bat NI WING Vo O ke A 2 AA le A iis Ee ena as a 3 9 SD ialO BS a aa a REE ad eG ag yaya Fee a te Ch She ee ase As 3 9 Help te aaa markea a aA eel od Se eee een Se ct ee eae AE A Defining geometry 4 Background Llei a a dd A are ac eee Sd dy de baa 4 2 Defining geometry using the DeViSoR 0 0 000000000000 4 3 An illustrated example osas das eke Re edo ee Sa ne Ss a eA 4 4 Remarks on geometry definition ooo ee Defining coarse meshes Dall Backsround s nic ee A Ree ok bh here SSE RA oe ee ee Bee A 5 2 Defining meshes using the DeViSoR 0 2 00 e 5 3 An illustrated example 5 4 Remarks on mesh definition e Additional FEAT features 6 1 Property queries saai Pad di a A A A A A eo AD A 6 2 Automated refinement 2 2 2 0
7. Note that it is illegal to mix these elements you have to restrict yourself to one type of finite element in one domain Then you connect every three or four nodes with the elements of your choice You don t have to add edges explicitly they are created implicitly It is very important that the mesh covers the wohle inside of your domain holes in the mesh will lead to a crash of the simulation during computing Especially elements must not intersect Additionally the elements must not be degenerated in other words all nodes must be different and any two edges of an element must not intersect Neighbouring elements should not differ much in size and the inner angles should not be too small or big Also try to avoid high aspect ratios of your elements which will destabilize your simulation Nodes can be placed on the boundary segments these boundary nodes can be manipulated via the parametrisation of the boundary and not via their cartesian coordinates like regular inner nodes All nodes edges and elements are indexed starting to count from 1 upwards 5 2 Defining meshes using the DeViSoR Node input To add nodes to the domain select the Nodes item from the combo box in the toolbar or in the Domain menu For your convenience and for more accuracy node input requires two clicks The first click attaches a little node to the mouse cursor Move it around on the drawing area to set the exact position of the new node Note that if you are
8. While testing we found out that the Java mouse event handling mechanism tended to be oblivious in other words error messages were forced because of clicks the Java Virtual Machine had not noticed Obviously Java is not really thread safe although all our code is executed from inside the event handling queue As a workaround solution we suggest that whatever you do you do it slowly System requirements As all huge Java programs the DeViSoR can be a RAM killer sometimes so we suggest you allow the application at least 50 megs of free RAM and more if your geometries and grids consist of numerous items It however does not consume a lot of CPU power though For PC users We tested it successfully on Pentium II machines with 128 MB of RAM both under Windows 2000 and Linux using the KDE2 Rebuilding did take a while but everyday s work was reasonably fast How to contact us In the unlikely case that you have found bugs or might even have fixed them already or whenever you have questions please take a look at our homepage on the web at http www featflow de where we will launch a FAQ section soon after the official release Also program updates will be dis tributed there Note that we also wrote a complete programmer s guide which is accessible online This should help you to fix bugs yourself if you know how to program in Java If you want to contact us directly please send an email to devisor featflow de 2 BEFORE YOU START 3 2 Be
9. an change the working boundary using this combo box or using the dialog shown via the corresponding menu item from the Domain menu By default when starting up the domain is empty and therefore only contains the symbolic boundary with index 1 4 DEFINING GEOMETRY 9 Adding segments Each new segment is always added as last segment to the current working boundary So first thing to add segments select the boundary you want to work on To add Lines select the line entry from the combo box in the toolbar or via the Domain menu The first click sets the start point of the line and as visual feedback a line is drawn from the start point to the mouse cursor position The current length of the line is additionally displayed The second click fixes the end point An error message is displayed if start and end point are the same otherwise the line is added to the domain For your convenience the type Multiline can be used to add polygons The end point of the line you just added will be used as start point for the next line Note that a single right click cancels multiline input leaving all lines in the domain except the line just being added If you prefer direct input mark the corresponding entry in the menu Any click on the drawing area results in displaying the line dialog where you can directly input the start and end point coordinates To add circles or arcs select the Circle or Circle entry from the Domain menu or in the toolbar depen
10. cles A circle is defined by its midpoint its radius and two angles which define the arc Any arc except 0 is possible for example a half circle starting at 90 degrees and ending at 270 degrees All angles are measured in degrees against the three o clock position or the positive x axis Circles can have positive or negative orientation if the start angle is less than the end angle the orientation is positive otherwise negative The start point of the arc corresponds to the local parameter value 0 the end point of the arc to the local parameter value 1 Circles must not be points in other words the radius must not be 0 or negative and the arc must be non zero The parametrisation of each boundary must be continous this means you must not connect two end points of two segments but each start point must be identical to the end point of the segment before It is also illegal to have holes in the parametrisation in other words segment number 1 must start at the end point of segment number 0 segment number 2 must start at the end point of segment number 1 and so on up to the last segment which must end at the start point of segment number 0 so that the boundary is closed 4 2 Defining geometry using the DeViSoR New boundaries New boundaries are added to the domain using the corresponding menu entry or the button in the toolbar One boundary is always the working boundary its number is displayed in the combo box in the toolbar You c
11. ding on the type of orientation you want for the circle The first click sets the center of the circle Next the radius is specified A full circle is drawn from the center to the current mouse position Clicking the second time fixes the radius As visual feedback for the next step a line is drawn from the center to the cursor to indicate the start angle which is fixed by the third click Then the end angle is fixed in the same manner adding the circle to the domain with the last click Note that a double click when setting the start angle results in a full circle Here as well the current radius and angles are displayed For circles as well direct input is provided In direct mode any click on the drawing area will display a dialog where you can specify radius center coordinates and the angles The numbers next to the segments have two meanings The first one is the segment number in the boundary the segment belongs to the second number is the number of the boundary itself Deleting Boundaries When you are deleting segments from a boundary the parametrisation and numbering of the remaining segments is automatically updated Note that if you delete all segments in a boundary the resulting empty boundary is deleted as well This also applies to the cut and paste operation Fixing the parametrisation Sometimes it might happen that the parametrisation of a boundary is not correct e g non continuous for example if you use copy and paste to def
12. e that this also applies to the cut and paste operation But be careful because when pasting the selection again at the same position these nodes will not be retransformed into boundary nodes 5 3 An illustrated example Now it is again time to go back to the good old DFG benchmark we started working on in the previous chapter We will guide you through the process of defining a coarse mesh for the flow simulation which is the last step in the preprocessing After that you can use the generated files to start the computation 1 Load the geometry definition you saved in the last workshop 2 Add boundary nodes and nodes according to the following image Note that the node distribution represents the expected flow K DeViSoRGrid2 Preprocessing for the FEAST Software Family Ti a ae a FRA D Mode No mode Selecting Nodes Elements Segments CopyMode Append Node distribution in the DFG benchmark 3 Add Quad elements according to the following image 5 DEFINING COARSE MESHES 14 The complete domain for the DFG benchmark 4 To test your mesh start a test run of the TriGen program by selecting Refine from the Grid menu and enter the following parameters in the dialog 5 That s it start the FEATFLOW simulation And don t forget to save your work before you start 5 4 Remarks on mesh definition When defining meshes the following is essential for the correctness of your grid e Do not mix
13. er at coordinates 2 2 0 then the top right corner at coordinates 2 2 0 41 then the top left corner at coordinates 0 0 41 and close the rectangle with a line back to the bottom left corner Your geometry should now look like this K DeViSoRGrid2 Preprocessing for the FEAST Software Family aca okon Meme The outer boundary of the DGF benchmark 6 Add a second boundary to the domain make sure it becomes the working boundary 7 Select the Circle segment type 8 Add a full circle to the second boundary centered in the left half of the rectangle at coordinates 0 2 0 2 with radius 0 05 You should now have a geometry like this K DeViSoRGrid2 Preprocessing for the FEAST Software Family o re Das oa EEE AAA ADO METIA The complete boundary of the DGF benchmark 4 DEFINING GEOMETRY 11 9 4 4 Save your file in FEAT format because we will need it in the second workshop soon Remarks on geometry definition When defining geometry the following is essential for the correctness of your domain boundary Every boundary has to be closed Every boundary must have a continuous parametrisation Every segment must start at the end point of the previous segment and end at the start point of the next segment All boundaries must be orientated in such a fashion that the inside of the domain lies to the left of the boundaries The outer boundary must have positive counterclockwise orientation There ca
14. feat2tri f with a command like this 77 feat2tri f o feat2tri 6 3 Fixing parametrisation We have implemented all parametrisation fixing in one big operation called Adjust boundaries to be found in the Domain menu All boundaries are processed trying to make each boundary continous and trying to fix the parameter values of each boundary node The debug output generated by these operations is displayed in a dialog box afterwards and you can learn if the operation was a success If you have accidentally created boundaries with incorrect orientation you can swap the orientation of the working boundary with the Svap boundary orientation menu item 7 ADDITIONAL FEAST FEATURES 16 7 Additional FEAST features The FEAST format is not entirely supported so far so we just give a short list of what you can expect for the next release Macros Macros are an extension to Quadratic elements which allow for anisotropic refinement Addi tionally macros can be combined into parallel blocks to increase efficiency on parallel computers Enhanced Edges You will be able to assign stati to edges and of course boundary conditions to bound ary edges Rectification Macros can automatically be transformed into rectangular proportions to increase the stability of the numerical computation A Licence Agreement The DeViSoR comes as is with absolutely no warranty of any kind The DeViSoR comes as pure open source software the user is granted permission t
15. fore you start 2 1 Installation The DeViSoRGrid2 program comes entirely written in Java so the first thing you have to do is get a JDK for your machine or contact your system administrator to figure out if you already have one However visit Sun at http www java sun com to get your free JDK copy Note that JDK 1 4 is strongly recommended there are some bugs in the older Java versions that might cause the DeViSoR to crash Next up download the devisor2 tar gz archive file from our homepage and unpack it into any directory of your choice A new subdirectory called devisor2 will be created containing some useful scripts the startup class and the devisor2 source tree Additionally the manual subdirectory contains the full manual and FAQ also as HTML and some technical papers we wrote during specification To read these you will need the Acrobat Reader software available for free from www adobe com The data directory contains some example domains you can start practising with Note for Windows users As we consider the usual behaviour of common Windows applications very annoying no registry entries will be created Next add this directory to your CLASSPATH environment variable Under Linux and Solaris edit your cshrc file under Windows edit your autoexec bat script or add the CLASSPATH environment variable to the corresponding system properties under Windows 2K Don t forget to add the Java binaries directory to your PATH variable 2
16. ine a complex bound ary Afterwards you should use the Adjust Boundaries operation to be found in the Domain menu Additionally if you accidentally defined a boundary with the wrong orientation for example the outer boundary clockwise instead of counterclockwise you can use the Swap Boundary Orientation opera tion from the Domain menu to flip the orientation of the current working boundary in other words The first segment becomes the last segment the second segment becomes the secondlast and so on 4 3 An illustrated example In this chapter we will guide you through the definition of the geometry used for the DFG benchmark Flow around a Circle More details on this can be found in the Virtual Album of Fluid Motion accessible on the web at http www featflow de The geometry for this example is actually pretty simple We only need two boundaries the outer boundary is a large axis parallel rectangle the inner boundary a small circle centered in the left half of the rectangle So let s start 1 Start the DeViSoR if you have not already done so 2 Set the domain perimeter to the rectangle from 0 0 5 to 2 5 0 2 using the corresponding dialog 3 Add a new boundary by clicking on the New Boundary button in the toolbar 4 To define the outer boundary select the MultiLine segment type from the combo box in the toolbar 4 DEFINING GEOMETRY 10 5 Start with the bottom left corner at coordinates 0 0 then the bottom right corn
17. ion software For every domain two files are created the file with extension prm contains the geometry definition the tri file contains the mesh This is also the default file format for the DeViSoR Note that when loading a FEAT file it does not matter which of the two files you select FEAST This format additionally supports integrated parallel computing information UCD This format is supported for historical reasons If you want to change the format of your file use the Save As button Just pressing the Save button stores the file with its preset name and format 3 3 Drawing The following is a complete list of all items that can be interactively drawn on the drawing area We just list them here what they are and what they are for will be described in detail in the geometry and grid definition chapters later on e Nothing e Paste clipboard contents e Lines e Multilines e Positively orientated circles and arcs e Negatively orientated circles and arcs e Nodes e Triangles e Quadratics e Macros in FEAST only 3 BASIC PROGRAM INTERACTION 6 Choose whatever you want to draw from the Domain menu or the corresponding combo box in the toolbar It might be a little unusual that Pasting is a drawable item as well but once you get used to it it becomes very natural The same applies to the explicit type Nothing Generally all these items are drawn via point and click Every draw operation can at any time be cancelled by a si
18. load the one you want when you need it During startup the DeViSoR determines your operating system and tries to load the mentioned configu ration file devisorgrid or devisorgrid conf respectively If such a file cannot be found it starts with factory default options and as mentioned above you will have to set at least the DEVISORHOME option to the directory you installed the DeViSoR to and save your default options file again If your options file can not be loaded during startup under Windows the help will not work unfortunately Creating your own localisation If you don t like the english version of the DeViSoR you can create your own localised version Just create a copy of the default locale file Locale_en_US java to be found in the devisor2 grid options directory of your DeViSoR installation but make sure the copy is stored in the same directory Change the en to your target language a pair of lowercase letters that conform to ISO 639 and the US to your target country scheme two uppercase letters that conform to ISO 3166 in both filename and classname This file contains a long list of key value pairs which hold all localized Strings of the DeViSoR After that just try not to get bored while translating all the right hand side String values assigned to the keys And please DO NOT TRANSLATE THE KEYS Just compile the DeViSoR afterwards and that s it For your convenience we have added scripts called rebuild_devisor and rebuild_devi
19. moving it over a segment the cursor will change to indicate that you are about to add a boundary node instead of a regular one In any case the second click will add the node to the domain Alternatively you can use the direct input dialog activate direct input click anywhere on the domain and a dialog will appear which allows you to add new nodes either via their cartesian coordinates or by defining the parameter value and the boundary on which the node is going to be placed If you hit the Apply or OK button when the Cartesian tab is selected in the dialog a regular node will be created otherwise a boundary node Note that it is impossible to add two nodes at the same position You can try though but the DeViSoR will notice and just not add the second one Element input To add elements just select the type of element you want to add from the combo box or menu and then just click on the nodes you want to define the element with It is very important that you click on the nodes in the correct counterclockwise order Alternatively you can again use direct input to specify directly the nodes you want 5 DEFINING COARSE MESHES 13 Deleting nodes or elements When deleting elements and nodes are not selectable the nodes of the element are not deleted implicitly but the edges are if they are not shared with other edges When deleting segments and nodes are not selectable any boundary node on these segments is transformed to a regular node Not
20. n be only one outer boundary 5 DEFINING COARSE MESHES 12 5 Defining coarse meshes In this chapter we will first describe the theoretical background of mesh definition Afterwards the usage of the DeViSoR will be covered and we end up continuing the working example from the last chapter For your convenience this chapter closes with a list of the Do s and Dont s of mesh definition 5 1 Background The mesh of the domain describes the discretisation of the numerical simulation you are about to perform The DeViSoR is used to manually define a first coarse mesh which will be automatically refined during the calculation Mesh elements have a natural hierarchy The finite elements you can use are composed of Edges which again are defined by two Nodes Nodes are points in the plane The DeViSoR supports the FEM elements Triangle and Quadratic additionally providing the Macro type which is a Quadratic element with integrated anisotropic refinement and parallel computing information Usually the first thing to define a mesh is to figure out where to place nodes The general rule is to place a lot of the nodes and thus a lot of small scale elements in those areas where you expect the most to happen for example around the obstacles in flow simulations In the other regions of your domain a sparse node density and thus fewer large scale elements will suffice Then you have to decide if you want to use Triangles or Quadratics as finite elements
21. ngle click with the right mouse button For increased accuracy when adding items via mouse we implemented a snapping mechanism Within the Draw Options dialog you can define snap values for both vertical and horizontal direction Without snap every click point is directly converted to user coordinates with snapping enabled the drawing area is basically tiled into small rectangles and every click inside one of these rectangles is treated just like a click on the top left corner of the corresponding rectangle You can control the size of these rectangles by setting the two mentioned values all measured in pixels Additionally there is a tolerance factor which basically defines how close two clicks have to be to be counted as one This is important for picking selecting single items by clicking on them adding Boundary Nodes and of course determining if a circle is a full circle 3 4 Translating Scaling Rotating and Mirroring Every time you have selected some items by dragging a rubber band around them a box is drawn containing all selected items Additionally up to nine hotspots are marked on this box one if a single node is selected five if circles are part of the selection and nine otherwise Clicking and dragging them has the following consequences e The center hotspot or the only one if a single node is selected is used to move the selection around on the drawing area Just drag the selection to the desired target point and relea
22. o install as many copies as he wants Additionally the DeViSoR may be freely distributed free of charge in any commercial or non commercial way as long as the original distribution is not changed There are only three things the user must not do e Remove any part of the software e Remove references both in the source code and in the GUI to its original developers e Any bugs fixed any locale created in short any change to the DeViSoR source code must be reported to the developers by sending the full source code to devisor featflow de to be included in the next release Any changes considered worthy to be included in the next release will be listed in the Additional developers section of the About dialog in the next release B References e DeViSoR1 0 application and manual on the web at http www featflow de e The FEAT group and FEATFLOW also at http www featflow de e The FEAST group non surprisingly at http www featflow de
23. rbitrary boundary components or short boundaries each of which must be closed in itself Every boundary is orientated in such a fashion so that the inside of the domain is always left of the boundary Thus the outer boundary has mathematically positive orientation counterclockwise and all inner boundaries change from negative to positive back to negative orientation with increasing distance from the outer boundary Each boundary has a unique number through which it can be adressed starting with 0 for the first boundary Usually each boundary consists of several segments Each boundary has a quite natural parametrisation Each segment has a parameter interval of length 1 the first segment from 0 inclusive to 1 exclusive the next from 1 inclusive to 2 exclusive and so on Thus the maximal parameter value for each boundary is equal to its number of segments As boundaries are closed the maximal parameter value is again equal to the parameter value 0 Each segment has a unique index of two integer values one for the boundary it belongs to the other for the number it has inside that boundary Both indices start with 1 Segments can be of the following types Lines A line is defined by its start point and end point The start point corresponds to the local parameter value 0 the end point to the local parameter value 1 Lines must not be points in other words the start point coordinates must be different from the end point coordinates Cir
24. se the mouse button and the selected items will be updated accordingly Note that selections only comprised of boundary nodes must not be moved around on the drawing area to make sure no isolated boundary nodes without segments are created e The other hotspots are used for scaling Just drag one of these hotspots to a new position and the selected items will be scaled in both vertical and horizontal direction accordingly in that fashion so that the hotspot opposite the clicked one remains at its fixed position The four hotspots in the middle of the box s edges are used for scaling in horizontal or vertical direction respectively the corner hotspots are used for scaling in both directions at the same time e These hotspots are also used for rotating when the CTRL key is held down while clicking the hotspots Just drag the clicked hotspot to a new position and the selected items will be rotated by the angle between the line from the center of the select box and the original hotspot position and the line from the center to the new position If you prefer using dialogs for these tasks the corresponding ones can be found in the Edit menu Note that they will only work if you have selected some items Just enter scale factors multipliers or angles in degrees in the dialogs Mirroring also has two ways of input If direct mode is activated selecting Mirror from the Edit menu brings up a dialog to enter the start and end point of the line
25. sor bat for this task We implemented the localisation support exactly the way Sun recommends so the DeViSoR will load your localised version on next startup gathering your language and country from your operating system and using them to load the corresponding locale A friendly reminder Send your localised version to us by mailing it to devisor featflow de because this is part of our license policy you agreed to when installing your copy of the DeViSoR 3 BASIC PROGRAM INTERACTION 5 3 Basic program interaction 3 1 General Recommendation The application is still beta and the undo mechanism has not been implemented yet So we strongly recommend that you save your work in very small time steps to avoid unneccessary data loss and extra work And as mentioned above whatever you do do it slowly lest Java forgets your clicks The DeViSoR might seem a bit verbose at the current state of development but this is neccessary If you come across any crashes or occurring exceptions just copy the DeViSoR output with a brief description of what you were trying to do and send it as bug report to us Your help is greatly appreciated There are probably some details in this chapter you will not understand if you read it for the first time but you will as soon as you have finished the whole manual we guarantee you 3 2 Loading and Saving The DeViSoR supports the following file formats FEAT This is the default file format for the FEATFLOW simulat
26. t change any of the items it just changes the viewport 3 8 Dialogs All dialogs in the application are dockable that means they can be glued to the border of the frame by dragging them close to one and will remain there when the main frame is moved around Dragging them away from the border releases the lock Note that for each dialog the docking information can be added to your default configuration file by just saving the file before shutting down the DeViSoR Your dialog settings will then be restored during next startup 3 9 Help An electronic version of this manual can be displayed via the Manual entry from the Help menu or use any web browser to load the index html file in the manual directory of your DeViSoR installation So far no context sensitive help has been implemented we apologise for any inconvenience A collection of frequently asked questions is also available through the same menu 4 DEFINING GEOMETRY 8 4 Defining geometry In this chapter we will first describe the theoretical background of geometry definition Afterwards the usage of the DeViSoR will be covered and we end up with a little working example the world famous DFG benchmark For your convenience this chapter closes with a list of the Do s and Dont s of geometry definition 4 1 Background A domain consists of both geometry covered in this chapter and mesh covered in the next chapter The whole domain boundary or geometry consists of several a
27. und solution just check if you are missing boundary nodes after pasting and thus eventually elements and add them manually again Don t forget to fix the parametrisation afterwards see the geometry definition chapter how this can be accomplished Note that when creating a new domain by the New menu item or when loading a second domain the clipboard is not emptied thus allowing cross domain copy and paste 3 6 Printing Printing is implemented a little unusual We wanted to create real PostScript files and not just bitmap style postscripts like the ones Java usually creates So instead of printing directly we always print to a file you can of course set the location and name of the file in the Print dialog which you will have to print out manually afterwards If we had included some sort of piping mechanism to the default printer we would have lost platform independence Of course the Print command always prints out exactly what you see on the drawing area respecting the current zoom level etc 3 7 Viewing You can zoom in and out of the Drawing Area in different ways The menu item Zoom In performs a zoom by a constant factor centering the click point in the new view Zoom Out zooms back out by the same constant factor the Reset Zoom item zooms back to the default zoom level and with the Set Zoom entry any select box dragged open on the drawing area is instantly expanded to that it fills the whole screen However zooming does no
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