Waveller FBEM 5.4 User manual
Contents
1. The is replaced by an integer counting the number of boundary sets starting from 1 Line 2 Column 1 Real part of a Column 2 Imaginary part of a Column 3 Real part of b Column 4 Imaginary part of b Column 5 Real part of c Column 6 Imaginary part of c Line 3 either m n orjust Use the former version to define a range of elements from the value m to the value n with a step of 1 for which the BC definition will apply to or the later to define an individual element index Only one element per row can be defined Line 4 Can be used to define another range of element indices or individual elements Any number of lines is permitted Format is the same as Line 3 Example boundary 1 l ze701 02 0eE700 1 0eE700 0 06700 0 06700 006700 1 709997 71000 72000 80000 90100 boundary 2 0 0e 00 0 0e 00 1 0e 00 0 0e 00 1 2e 01 0 0e 00 91001 91999 The example defines 2 boundary condition set In boundary condition set 1 the boundary conditions for elements 1 to 70999 71000 72000 and elements 80000 to 90100 inclusive are defined as R a 12 8 a 0 R b 13 b 0 R c 0 4 C 0 Boundary condition set 2 applies to elements 91001 to 91999 inclusively and KUAVA R a 0 s a 0 R b 13 b 0 R c 12 8 C 0 Element Based Boundary Condition Each element based boundary condition follows the following format Line 1 Opening header for boundary definition per element Line 2 Column2. 1 Element index number Column 2 Real part of a Column 3 Imaginary part of a Column 4 Real part of b Column 5 Imaginary part of b Column 6 Real part of c Column 7 Imaginary part of c Line 3 Repetition of Line 2 for each element that should have its own unique boundary condition values Example per element 1 1 2e 01 0 0e 00 1 0e 00 0 0e 00 0 0e 00 0 1le 00 2 1 4e 01 0 2e 00 2 0e 00 0 0e 00 3 0e 00 0 0e 00 3 1 5e 01 0 0e 00 4 0e 00 0 0e 00 0 0e 00 0 5e 00 Point Source Definition File Source points for the model are defined in this file The format is as follows Line 1 Opening header source point definition source points Line 2 Integer indicating the number of source points defined Line 3 The first source point definition 5 columns of data Column 1 3 the X Y Z coordinates of the source point Column 4 the excitation magnitude of the point Column 5 the set number Line 4 Repetition of Line 3 for additional source points in the model If multiple point sources are to be defined in the model some simulation time can be saved by using some of the processing information generated by the first point source solution process as a starting point for the other point source solutions Using point source sets enables this time saving feature The 5 column is used to define the set number for the source point For example if two point sources are defined and each point source is given a unique set number th
3. 071884829e 01 VOG300601566090 71L7e 02 s20 0343003004 I Zle 0 1 eJOOUDLOGc ooo Loz 9e 01 200916 79425126 259e 01 0014900673996 170e 01 4649628623782629e 01 060168177320063e 01 60916423960 2506e U1 z0165510923970 226 00 ALO TBUCOIS0US0600E 01 951L60179460169624e 01 lt s80728 17070345838 18 01 14 36619611839106 01 4677884452090666e 01 o xy ADA OB WN KE WO FW AO F OD WP wo PATA OO 7 W O an A O WO e N LOOL 186838523374173 l26 01 T 202Z205 09 13930 gs97 10390600009601 Surface Pressure Results File The calculated surface pressure result data is written by the solver to this file The format is as follows Line 1 Opening header for pressure data iS pressure Line 2 Column 1 The number of nodes in the model Column 2 The number of sets in the pressure data The number of sets matches the number of point source sets defined Line 3 4 columns of data giving the pressure values for an individual node for a particular point source set Column 1 Point source set number Column 2 Node index number Column 3 Real value of the complex pressure Column 4 Imaginary value of the complex pressure Line 4 Repetition of Line 3 for all nodes in the model an source point sets Example pressure 36002 2 1 1 2 23 8046324680 64e 01 2 8953353342433241e 01 10 KUAVA 2 2 26115360771481261le 01 2 8876616870832311le 01 3 2x2 01o1 OG622 30306 U01 2 0c01 76520027502 95e 01 LA 230799929416018 1L 4e 01 22
4. 50z2 LIeS0s233945e 01 e 30002 233953338 7 0 712605 1le U1 2 86 727 2786418 74466 01 L 2e50860054 780150 296 01 2 0 746070500934 3646e 01 NO Z 30002 2237030531262 cosle 0L 2201979145711705296 01 Additional Points Pressure Results File The pressure data results for the defined additional points are contained in this file The file format is as follows Line 1 Opening header pressure in points Line 2 Column 1 Number of pressure points in the file Column 2 Number of source point sets in the file Line 3 4 columns of data giving the pressure values for an individual node for a particular point source set Column 1 Point source set number Column 2 Node index number Column 3 Real value of the complex pressure Column 4 Imaginary value of the complex pressure Line 4 Repetition of Line 3 for all nodes in the model and source point sets Example pressure in points LOU 2 1 1 2 2378046324680 64e 01 2 8953353342433241e 01 l1 2 2 26115367714812 61e 01 2 88766168 083231l11e 701 L 3 22 10 51088221730338701 2 0001965200275295e 01 I 4 2307999294101801 46 01 2 802 L18905323394586 01 i 1000 23393358 071260518 701 2 860 727 5004167 446e 01 2 d Ze S0VSG00S4 7COLSUZ9S 01l Z2 67407550e9sS4304ce 01 2 LOO 23 lOs05olZos3 7 Coo le 01 2891973L4971L17 009296 01 11
5. KUAVA Waveller FBEM 5 4 User manual Definitions of the ASCII file formats CONTENTS Background Solution Initiation File Format General Section Speed of Sound solver Algorithm Verbose Beta MLEMA Section lteration Tolerance Restart Value Maxrestart Value Preconditioner Size Mesh Definition File Boundary Conditions definition File source Setup Section Solution Frequency Point Sources Source Points Locations file Intermediate Section Surface Pressure Result File Status Filename Additional Result Points Section Additional Points Definition File Evaluation Method Additional Points Results File Initialisation File Example Mesh Definition File Node Definition Element Definition Boundary Conditions Definition File Group Based Boundary Condition Element Based Boundary Condition Point Source Definition File Additional Pressure Evaluation Points File Surface Pressure Results File Additional Points Pressure Results File KUAVA KUAVA Background This is the user manual of the fast boundary element method software Waveller FBEM later WFBEM A solution requires the following files with some of the files optional Initiation file containing the key setup parameters for the model Mesh definition file containing node points and element connectivity for the model Boundary conditions definition file Optional Point source definition file Optional Additional pressure evaluation points definition f
6. e and location of the file for the surface pressure results formatted as defined in section 7 is defined using filename where is system path and filename of the results file Status Filename The solver error status name and location is defined with status filename where is system path and filename of the status file Additional Result Points Section Additional result points are handled in this section and the header pressure used to initiate the section The section defines the files required to define the additional points and the filename for the pressure results Additional Points Definition File The additional points are defined according to section 6 and the name and location of the file is defined with evaluation points filename where is system path and filename of the file Evaluation Method Either the scattered pressure is calculated by setting total 0 or the total pressure field is calculated with total 1 Additional Points Results File The name and location of the additional points pressure results file is defined with result filename where is system path and filename of the file defined according to section 8 Initialisation File Example general C 340 algorithm 2 Silent 0 beta l KUAVA MLFMA tol le 3 restart 15 maxrestart 4 tau 0 5 mesh filename sphere mesh dat boundary filename sphere boundary dat sou
7. en for the defined model set up two sets of results will be generated one set for the first point source set and a second for the second set In addition more than one point source can be active in any one solution so for example two points sources can be generating sound in one point source set solution and a third source used in a second point source set defined which can use some information from the first solution Example source points 3 KUAVA eo Oe OO Ls l 0 0 laco Use 2a J 0 0 Ce 2a Sul 2 In the example 2 point source sets are defined Point sources 1 and 2 are active together in the first set and only source 3 is active in the second Additional Pressure Evaluation Points File Additional points can be defined in the model and the pressure values at those points determined The format is as follows Line 1 Opening header for point definition points Line 2 The number of additional points defined Line 3 The line contains the data for the individual point definition Column 1 The Index of the additional node Columns 2 4 The X Y Z coordinate values of the point s location Line 4 Repetition of Line 3 for the other additional points in the model Example points 1001 Qe LOU 39402553524 64e 01 sO9991234324505235e 01 34776602714762417e O1 Waise Ne ote oaie eo Ri s09Z0IZ0 90151602 6 702 8874614903923941e 01 eLI4327120652280se U01 9447478252811720e 01 6914711540626879e 02 6004447
8. ile Model surface pressure results file Optional Additional pressure evaluation points results file a oer YS All of the files use whitespace as column delimiters All files use section headers in the format The initiation file uses semicolons to terminate each line other than the header lines Solution Initiation File Format The solution initiation file contains information about a specific solution Multiple solutions can refer to common files such as the mesh definition file but each solution must have a unique solution initiation file The file is named lt SolutionName gt ini Note that all lines except the header lines are terminated with a semicolon General Section The general section of the ini file is started using the header general Speed of Sound The speed of sound is defined using c where is the sound speed in the unit system used to define the nodal positions and is a double scalar value solver Algorithm The solver can be initiated to solve using two possible methods algorithm 1 Initiates the gaussian elimination method and algorithm 2 initiates the GMRES with MLFMA method Verbose Set silent 0 to Suppress output from the solver and silent 1 for verbose output Beta If beta 1 then value of B is set to a default value of If beta is not equal to 1 then the beta is assigned the value given Beta can be any complex scalar value Typica
9. ining node element data Boundary Conditions Definition File The name and location of the file containing the boundary condition data as specified in section 4 is defined as follows Line 3 Opening header boundary Line 4 filename Where is the system path and filename to the file containing boundary condition definition data Source Setup Section The source setup section defines the solution frequency sets the presence of source points in the model and defines the name and location of the additional source points file is required The section is started with the header source Solution Frequency The solution frequency is defined with where is a double scalar value with units of Hz KUAVA Point Sources The presence of active point sources in the model is set using type where is a binary value type 0 sets the model to include source points and type 1 sets the model to exclude source points Source Points Locations file The name and location of the file containing the source point definitions as specified in section 5 is set using points filename where is the system path and filename of the file Intermediate Section The intermediate section defines the name and location of the surface pressure file and the name of the the status file use to indicate the error state of the solver The header for the section is intermediate Surface Pressure Result File The nam
10. is functions 1 1 order 2 2 order Line 3 Column 1 Element Number Columns 2 4 Node indexes of the nodes belonging to the element The node order is n1 n2 n3 Line 3 is repeated for each of the elements with the total number of repeated lines matching the entry in line 2 Note that the order of the nodes in the element definition dictate the direction of the element normal Figure 1 shows the relation between the node order and the direction of the element normal Element normals should point into the acoustic medium P n2 a 5 n3 Figure 1 Element Node Order and Element Normal Direction Example surface elements 12000 1 L23 UI A WN e OO 2 4 Zo io eS Ov 72000 36002 546 756 Boundary Conditions Definition File The boundary conditions BCs are defined in this file The file begins with a header line params followed by the number of mesh elements expected in the BC definition file KUAVA The actual BCs are defined using either element groups of conditions using boundary or individual element definitions using per element For each group 6 BC parameters must be defined plus the index to the elements the BC is to be applied to The 6 BC parameters define the values of a b and c to fulfil the bc equation aP ae C dn Group Based Boundary Condition Each boundary condition group follows the following format Line 1 Opening header for boundary definition boundary
11. lly the default value is used KUAVA MLFMA Section The MLFMA section is started with the header MLFMA Iteration Tolerance The iteration tolerance value determines the iteration stop criterion and is set with tol where is a double scalar value Restart Value The parameter restart controls the GMRES restarting feature setting the restart integer value to A higher number causes the program to use more memory but the convergence may be faster A value between 20 and 30 is recommended Maxrestart Value The value of maxrestart controls the number of time GMRES is restarted until the solution converges The value of is an integer value and the product of restart maxrestart determines the maximum number of iterations to use A value of 10 is suggested Preconditioner Size The size of the preconditioner and the speed of the convergence is determined with tau where is a double scalar value Values between 1e 6 and 1e 2 are good guesses with a suggested starting value of 1e 3 If convergence problems occur then set the value of tau to a smaller value A negative value of tau causes the problem to be solved with the preconditioner Mesh Definition File The name and location of the file containing the node element definitions as specified in section 3 is defined as follows Line 1 Opening header mesh Line 2 filename where is the system path and filename to the file conta
12. rce E 1000 type 0 points filename source point mesh intermediate filename file Pedar status filename WFBEM STATUS pressure evaluation points filename evaluation points dar total 1 result tilename pressure dac Mesh Definition File The mesh definition file describes the nodes and elements definitions Node Definition The nodal positions for the model are defined using the following line features Line 1 Opening header for node information nodes Line 2 Number of nodes in the mesh Line 3 Column 1 Node Number Columns 2 4 X Y Z coordinate of node point Line 3 is repeated for each of the nodes with the total number of repeated lines matching the entry in line 2 Example nodes 36002 1 0 0000000000000000e 00 0 0000000000000000e 00 1 0000000000000000e 00 2 1 5044000000000000e 02 0 0000000000000000eE 00 9 998869999999999T7e 01 3 4 6490000000000004e 03 1 4308000000000000eE 02 9 9988699999999997e 01 4 3 0360000000000002e 02 O 0000000000000000e 00 9 9953899999999996e 01 5 L980 73999959999999Se 02 1 44390000000000006E 02 9 9969 799999999993e 01 36002 1 4475399999999999e 01 0 0000000000000000e 00 9 8946800000000001e 01 Element Definition The element connectivity for the model is defined as follows KUAVA Line 1 Opening header for element information surface elements Line 2 Column 1 Number of elements to be defined in the mesh Column 2 The order of the element bas
Download Pdf Manuals
Related Search