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[snappyHexMesh] snappyHexMesh and cyclic boundaries |
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December 6, 2013, 09:55 |
snappyHexMesh and cyclic boundaries
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#1 |
Member
Julian Langowski
Join Date: May 2011
Location: Bremen, Germany
Posts: 91
Rep Power: 15 |
Dear Foamers,
again I ask for help. I am working on the simulation of a rotating wind turbine rotor blade. With blockMesh I create a 120° 'wedge' which later shall contain 1 rotor blade (see figure 1). Finally I figured out how to create the blockMesh blocks in a way, that snappy works properly, see here: Code:
/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.2.2 | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class dictionary; object blockMeshDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // #include "include/vertices" convertToMeters 1; vertices ( ($x_up_up $y_in_out $z_in_out_pos) ($x_up $y_in_out $z_in_out_pos) ($x_down $y_in_out $z_in_out_pos) ($x_down_down $y_in_out $z_in_out_pos) ($x_up_up $y_mid_out $z_mid_out_pos) ($x_up $y_mid_out $z_mid_out_pos) ($x_down $y_mid_out $z_mid_out_pos) ($x_down_down $y_mid_out $z_mid_out_pos) ($x_up_up $y_out_out $z_out_out_pos) ($x_up $y_out_out $z_out_out_pos) ($x_down $y_out_out $z_out_out_pos) ($x_down_down $y_out_out $z_out_out_pos) ($x_up_up $y_in_in $z_in_in_pos) ($x_up $y_in_in $z_in_in_pos) ($x_down $y_in_in $z_in_in_pos) ($x_down_down $y_in_in $z_in_in_pos) ($x_up_up $y_mid_in $z_mid_in_pos) ($x_up $y_mid_in $z_mid_in_pos) ($x_down $y_mid_in $z_mid_in_pos) ($x_down_down $y_mid_in $z_mid_in_pos) ($x_up_up $y_out_in $z_out_in_pos) ($x_up $y_out_in $z_out_in_pos) ($x_down $y_out_in $z_out_in_pos) ($x_down_down $y_out_in $z_out_in_pos) ($x_up_up $y_in_in $z_in_in_neg) ($x_up $y_in_in $z_in_in_neg) ($x_down $y_in_in $z_in_in_neg) ($x_down_down $y_in_in $z_in_in_neg) ($x_up_up $y_mid_in $z_mid_in_neg) ($x_up $y_mid_in $z_mid_in_neg) ($x_down $y_mid_in $z_mid_in_neg) ($x_down_down $y_mid_in $z_mid_in_neg) ($x_up_up $y_out_in $z_out_in_neg) ($x_up $y_out_in $z_out_in_neg) ($x_down $y_out_in $z_out_in_neg) ($x_down_down $y_out_in $z_out_in_neg) ($x_up_up $y_in_out $z_in_out_neg) ($x_up $y_in_out $z_in_out_neg) ($x_down $y_in_out $z_in_out_neg) ($x_down_down $y_in_out $z_in_out_neg) ($x_up_up $y_mid_out $z_mid_out_neg) ($x_up $y_mid_out $z_mid_out_neg) ($x_down $y_mid_out $z_mid_out_neg) ($x_down_down $y_mid_out $z_mid_out_neg) ($x_up_up $y_out_out $z_out_out_neg) ($x_up $y_out_out $z_out_out_neg) ($x_down $y_out_out $z_out_out_neg) ($x_down_down $y_out_out $z_out_out_neg) ); blocks ( hex (12 13 17 16 0 1 5 4) ($N_x_up $N_y_c $N_z_pos) simpleGrading ($R_x_up 1 $R_z_pos) hex (24 25 29 28 12 13 17 16) ($N_x_up $N_y_c $N_z_c) simpleGrading ($R_x_up 1 1) hex (36 37 41 40 24 25 29 28) ($N_x_up $N_y_c $N_z_neg) simpleGrading ($R_x_up 1 $R_z_neg) hex (16 17 21 20 4 5 9 8) ($N_x_up $N_y $N_z_pos) simpleGrading ($R_x_up $R_y $R_z_pos) hex (28 29 33 32 16 17 21 20) ($N_x_up $N_y $N_z_c) simpleGrading ($R_x_up $R_y 1) hex (40 41 45 44 28 29 33 32) ($N_x_up $N_y $N_z_neg) simpleGrading ($R_x_up $R_y $R_z_neg) hex (13 14 18 17 1 2 6 5) ($N_x_c $N_y_c $N_z_pos) simpleGrading (1 1 $R_z_pos) hex (25 26 30 29 13 14 18 17) ($N_x_c $N_y_c $N_z_c) simpleGrading (1 1 1) hex (37 38 42 41 25 26 30 29) ($N_x_c $N_y_c $N_z_neg) simpleGrading (1 1 $R_z_neg) hex (17 18 22 21 5 6 10 9) ($N_x_c $N_y $N_z_pos) simpleGrading (1 $R_y $R_z_pos) hex (29 30 34 33 17 18 22 21) ($N_x_c $N_y $N_z_c) simpleGrading (1 $R_y 1) hex (41 42 46 45 29 30 34 33) ($N_x_c $N_y $N_z_neg) simpleGrading (1 $R_y $R_z_neg) hex (14 15 19 18 2 3 7 6) ($N_x_down $N_y_c $N_z_pos) simpleGrading ($R_x_down 1 $R_z_pos) hex (26 27 31 30 14 15 19 18) ($N_x_down $N_y_c $N_z_c) simpleGrading ($R_x_down 1 1) hex (38 39 43 42 26 27 31 30) ($N_x_down $N_y_c $N_z_neg) simpleGrading ($R_x_down 1 $R_z_neg) hex (18 19 23 22 6 7 11 10) ($N_x_down $N_y $N_z_pos) simpleGrading ($R_x_down $R_y $R_z_pos) hex (30 31 35 34 18 19 23 22) ($N_x_down $N_y $N_z_c) simpleGrading ($R_x_down $R_y 1) hex (42 43 47 46 30 31 35 34) ($N_x_down $N_y $N_z_neg) simpleGrading ($R_x_down $R_y $R_z_neg) ); edges ( arc 0 12 ($x_up_up $y_arc_in $z_arc_in_pos) arc 12 24 ($x_up_up $y_arc_in_c $z_arc_in_c) arc 24 36 ($x_up_up $y_arc_in $z_arc_in_neg) arc 1 13 ($x_up $y_arc_in $z_arc_in_pos) arc 13 25 ($x_up $y_arc_in_c $z_arc_in_c) arc 25 37 ($x_up $y_arc_in $z_arc_in_neg) arc 2 14 ($x_down $y_arc_in $z_arc_in_pos) arc 14 26 ($x_down $y_arc_in_c $z_arc_in_c) arc 26 38 ($x_down $y_arc_in $z_arc_in_neg) arc 3 15 ($x_down_down $y_arc_in $z_arc_in_pos) arc 15 27 ($x_down_down $y_arc_in_c $z_arc_in_c) arc 27 39 ($x_down_down $y_arc_in $z_arc_in_neg) arc 4 16 ($x_up_up $y_arc_mid $z_arc_mid_pos) arc 16 28 ($x_up_up $y_arc_mid_c $z_arc_mid_c) arc 28 40 ($x_up_up $y_arc_mid $z_arc_mid_neg) arc 5 17 ($x_up $y_arc_mid $z_arc_mid_pos) arc 17 29 ($x_up $y_arc_mid_c $z_arc_mid_c) arc 29 41 ($x_up $y_arc_mid $z_arc_mid_neg) arc 6 18 ($x_down $y_arc_mid $z_arc_mid_pos) arc 18 30 ($x_down $y_arc_mid_c $z_arc_mid_c) arc 30 42 ($x_down $y_arc_mid $z_arc_mid_neg) arc 7 19 ($x_down_down $y_arc_mid $z_arc_mid_pos) arc 19 31 ($x_down_down $y_arc_mid_c $z_arc_mid_c) arc 31 43 ($x_down_down $y_arc_mid $z_arc_mid_neg) arc 8 20 ($x_up_up $y_arc_out $z_arc_out_pos) arc 20 32 ($x_up_up $y_arc_out_c $z_arc_out_c) arc 32 44 ($x_up_up $y_arc_out $z_arc_out_neg) arc 9 21 ($x_up $y_arc_out $z_arc_out_pos) arc 21 33 ($x_up $y_arc_out_c $z_arc_out_c) arc 33 45 ($x_up $y_arc_out $z_arc_out_neg) arc 10 22 ($x_down $y_arc_out $z_arc_out_pos) arc 22 34 ($x_down $y_arc_out_c $z_arc_out_c) arc 34 46 ($x_down $y_arc_out $z_arc_out_neg) arc 11 23 ($x_down_down $y_arc_out $z_arc_out_pos) arc 23 35 ($x_down_down $y_arc_out_c $z_arc_out_c) arc 35 47 ($x_down_down $y_arc_out $z_arc_out_neg) polyLine 24 28 ( ($x_up_up $y_TE_in $z_TE_in) ($x_up_up $y_TE_mid $z_TE_mid) ($x_up_up $y_TE_out $z_TE_out) ) polyLine 25 29 ( ($x_up $y_TE_in $z_TE_in) ($x_up $y_TE_mid $z_TE_mid) ($x_up $y_TE_out $z_TE_out) ) polyLine 26 30 ( ($x_down $y_TE_in $z_TE_in) ($x_down $y_TE_mid $z_TE_mid) ($x_down $y_TE_out $z_TE_out) ) polyLine 27 31 ( ($x_down_down $y_TE_in $z_TE_in) ($x_down_down $y_TE_mid $z_TE_mid) ($x_down_down $y_TE_out $z_TE_out) ) ); boundary ( inlet { type patch; faces ( (4 16 12 0) (16 28 24 12) (28 40 36 24) (8 20 16 4) (20 32 28 16) (32 44 40 28) ); } outlet { type patch; faces ( (7 3 15 19) (19 15 27 31) (31 27 39 43) (11 7 19 23) (23 19 31 35) (35 31 43 47) ); } innerWall { type wall; faces ( (0 12 13 1) (12 24 25 13) (24 36 37 25) (1 13 14 2) (13 25 26 14) (25 37 38 26) (2 14 15 3) (14 26 27 15) (26 38 39 27) ); } outerWall { type patch; faces ( (8 9 21 20) (20 21 33 32) (32 33 45 44) (9 10 22 21) (21 22 34 33) (33 34 46 45) (10 11 23 22) (22 23 35 34) (34 35 47 46) ); } /*rightWall { type patch; faces ( (8 4 5 9) (4 0 1 5) (9 5 6 10) (5 1 2 6) (10 6 7 11) (6 2 3 7) ); } leftWall { type patch; faces ( (44 45 41 40) (40 41 37 36) (45 46 42 41) (41 42 38 37) (46 47 43 42) (42 43 39 38) ); }*/ rightWall { type cyclic; neighbourPatch leftWall; faces ( (8 4 5 9) (4 0 1 5) (9 5 6 10) (5 1 2 6) (10 6 7 11) (6 2 3 7) ); } leftWall { type cyclic; neighbourPatch rightWall; faces ( (44 45 41 40) (40 41 37 36) (45 46 42 41) (41 42 38 37) (46 47 43 42) (42 43 39 38) ); } ); // ************************************************************************* // Code:
/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.2.2 | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ // +++ Vertex coodinates //x-direction x_up_up -4; x_up -0.04; x_down_down 7; x_down 0.03; //y-direction y_in_out 0.03457; y_mid_out 0.55957; y_out_out 2.50000; y_in_in 0.05988; y_mid_in 1.10988; y_out_in 4.33013; //z-direction z_in_out_pos 0.05988; z_in_out_neg -0.05988; z_mid_out_pos 0.96921; z_mid_out_neg -0.96921; z_out_out_pos 4.33013; z_out_out_neg -4.33013; z_in_in_pos 0.03457; z_in_in_neg -0.03457; z_mid_in_pos 0.03457; z_mid_in_neg -0.03457; z_out_in_pos 2.50000; z_out_in_neg -2.50000; // +++ Block grading parameters //x-direction N_x_c 20; N_x_up 65; N_x_down 95; R_x_up 0.01334; R_x_down 95.78231; //y-direction N_y_c 300; N_y 65; R_y 73.47398; //z-direction N_z_c 10; N_z_pos 5; N_z_neg 5; R_z_pos 1.12151; R_z_neg 0.89166; // +++ Arc vertices //y-coordinates y_arc_in_c 0.06914; y_arc_mid_c 1.11914; y_arc_out_c 5.00000; y_arc_in 0.04889; y_arc_mid 0.79135; y_arc_out 3.53553; //z-coordinates z_arc_in_c 0.00000; z_arc_mid_c 0.00000; z_arc_out_c 0.00000; z_arc_in_pos 0.04889; z_arc_in_neg -0.04889; z_arc_mid_pos 0.79135; z_arc_mid_neg -0.79135; z_arc_out_pos 3.53553; z_arc_out_neg -3.53553; // +++ TE vertices y_TE_in 0.167; y_TE_mid 0.333; y_TE_out 0.5; z_TE_in -0.07; z_TE_mid -0.07; z_TE_out -0.03457; #inputMode merge // ************************************************************************* // Code:
/*---------------------------------------------------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.2.2 | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ Build : 2.2.2-9240f8b967db Exec : snappyHexMesh Date : Dec 06 2013 Time : 14:33:26 Host : "julian-Pc" PID : 3959 Case : /home/julian/OpenFOAM/julian-2.2.2/run/mesh_MRF_20131206 nProcs : 1 sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE). fileModificationChecking : Monitoring run-time modified files using timeStampMaster allowSystemOperations : Disallowing user-supplied system call operations // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time Create mesh for time = 0 Read mesh in = 1.05 s Overall mesh bounding box : (-4 0.03457 -4.33013) (7 5 4.33013) Relative tolerance : 1e-06 Absolute matching distance : 1.48545e-05 Reading refinement surfaces. Read refinement surfaces in = 0.58 s Reading refinement shells. Read refinement shells in = 0 s Setting refinement level of surface to be consistent with shells. Checked shell refinement in = 0 s Reading features. Read features in = 0 s Determining initial surface intersections ----------------------------------------- Edge intersection testing: Number of edges : 3952900 Number of edges to retest : 3952900 Number of intersected edges : 5663 Calculated surface intersections in = 4.89 s Initial mesh : cells:1314000 faces:3952900 points:1324920 Cells per refinement level: 0 1314000 Adding patches for surface regions ---------------------------------- Patch Type Region ----- ---- ------ rotor: 6 wall rotor_OBJECT Added patches in = 0.09 s Selecting decompositionMethod none Refinement phase ---------------- Found point (0 4 0) in cell 607411 on processor 0 Surface refinement iteration 0 ------------------------------ Marked for refinement due to surface intersection : 7630 cells. Marked for refinement due to curvature/regions : 0 cells. Determined cells to refine in = 1.16 s Selected for refinement : 7630 cells (out of 1314000) Cannot find point in pts1 matching point 28325 coord:(0.00025 0.035445 -0.0613955) in pts0 when using tolerance 2.47488e-07 Searching started from:0 in pts1 Compared coord: (0.00025 0.0354477 -0.061394) at index 0 with difference to point 3.07029e-06 Cannot find point in pts1 matching point 28025 coord:(-0.00325 0.035445 -0.0613956) in pts0 when using tolerance 2.47488e-07 Searching started from:0 in pts1 Compared coord: (0.00025 0.0354477 -0.061394) at index 0 with difference to point 0.0035 Compared coord: (-0.00325 0.0354477 -0.061394) at index 1 with difference to point 3.07029e-06 Cannot find point in pts1 matching point 28625 coord:(0.00375 0.035445 -0.0613956) in pts0 when using tolerance 2.47488e-07 Searching started from:1 in pts1 Compared coord: (-0.00325 0.0354477 -0.061394) at index 1 with difference to point 0.007 Compared coord: (0.00375 0.0354477 -0.061394) at index 2 with difference to point 3.07029e-06 Cannot find point in pts1 matching point 27725 coord:(-0.00675 0.035445 -0.0613956) in pts0 when using tolerance 2.47488e-07 Searching started from:2 in pts1 Compared coord: (0.00375 0.0354477 -0.061394) at index 2 with difference to point 0.0105 Compared coord: (-0.00675 0.0354477 -0.061394) at index 3 with difference to point 3.07029e-06 Cannot find point in pts1 matching point 28925 coord:(0.00725 0.035445 -0.0613956) in pts0 when using tolerance 2.47488e-07 Searching started from:3 in pts1 Compared coord: (-0.00675 0.0354477 -0.061394) at index 3 with difference to point 0.014 Compared coord: (0.00725 0.0354477 -0.061394) at index 4 with difference to point 3.07029e-06 Cannot find point in pts1 matching point 27425 coord:(-0.01025 0.035445 -0.0613956) in pts0 when using tolerance 2.47488e-07 Searching started from:4 in pts1 Compared coord: (0.00725 0.0354477 -0.061394) at index 4 with difference to point 0.0175 Compared coord: (-0.01025 0.0354477 -0.061394) at index 5 with difference to point 3.07029e-06 Cannot find point in pts1 matching point 29225 coord:(0.01075 0.035445 -0.0613955) in pts0 when using tolerance 2.47488e-07 Searching started from:5 in pts1 Compared coord: (-0.01025 0.0354477 -0.061394) at index 5 with difference to point 0.021 Compared coord: (0.01075 0.0354477 -0.061394) at index 6 with difference to point 3.07029e-06 Cannot find point in pts1 matching point 27125 coord:(-0.01375 0.035445 -0.0613956) in pts0 when using tolerance 2.47488e-07 Searching started from:6 in pts1 Compared coord: (0.01075 0.0354477 -0.061394) at index 6 with difference to point 0.0245 Compared coord: (-0.01375 0.0354477 -0.061394) at index 7 with difference to point 3.07029e-06 Cannot find point in pts1 matching point 29525 coord:(0.01425 0.035445 -0.0613956) in pts0 when using tolerance 2.47488e-07 Searching started from:7 in pts1 Compared coord: (-0.01375 0.0354477 -0.061394) at index 7 with difference to point 0.028 Compared coord: (0.01425 0.0354477 -0.061394) at index 8 with difference to point 3.07029e-06 Cannot find point in pts1 matching point 26825 coord:(-0.01725 0.035445 -0.0613956) in pts0 when using tolerance 2.47488e-07 Searching started from:8 in pts1 Compared coord: (0.01425 0.0354477 -0.061394) at index 8 with difference to point 0.0315 Compared coord: (-0.01725 0.0354477 -0.061394) at index 9 with difference to point 3.07029e-06 Cannot find point in pts1 matching point 29825 coord:(0.01775 0.035445 -0.0613956) in pts0 when using tolerance 2.47488e-07 Searching started from:9 in pts1 Compared coord: (-0.01725 0.0354477 -0.061394) at index 9 with difference to point 0.035 Compared coord: (0.01775 0.0354477 -0.061394) at index 10 with difference to point 3.07029e-06 Cannot find point in pts1 matching point 26525 coord:(-0.02075 0.035445 -0.0613956) in pts0 when using tolerance 2.47488e-07 Searching started from:10 in pts1 Compared coord: (0.01775 0.0354477 -0.061394) at index 10 with difference to point 0.0385 AND SO ON... Does anyone have a tip how to handle this? Thanks! Best regards Julian |
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December 8, 2013, 16:53 |
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#2 |
Senior Member
Artur
Join Date: May 2013
Location: Southampton, UK
Posts: 372
Rep Power: 20 |
Hi,
It's not obvious to me why snappy yields this error in your case. I suggest that you run "checkMesh -allGeometry" on your block mesh to see if everything is indeed in order. If it is then one way to get around the problem would be to create the mesh with other patch types and then use "createPatch -overwrite" and "topoSet" to create the cyclic boundaries afterwards. See the incompressible/pimpleDyMFoam/propeller tutorial as to how it can be done. Cheers, A |
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December 9, 2013, 07:51 |
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#3 |
Member
Julian Langowski
Join Date: May 2011
Location: Bremen, Germany
Posts: 91
Rep Power: 15 |
Dear Artur,
thanks for your reply. This is the outcome from checkMesh -allGeometry -allTopology after running blockMesh with cyclic patches activated: Code:
Create time Create polyMesh for time = 0 Enabling all geometry checks. Time = 0 Mesh stats points: 1356957 faces: 3919600 internal faces: 3770000 cells: 1281600 faces per cell: 6 boundary patches: 6 point zones: 0 face zones: 0 cell zones: 0 Overall number of cells of each type: hexahedra: 1281600 prisms: 0 wedges: 0 pyramids: 0 tet wedges: 0 tetrahedra: 0 polyhedra: 0 Checking topology... Boundary definition OK. Cell to face addressing OK. Point usage OK. Upper triangular ordering OK. Face vertices OK. Number of regions: 1 (OK). Checking patch topology for multiply connected surfaces... Patch Faces Points Surface topology Bounding box inlet 7120 7497 ok (non-closed singly connected) (-4 0.03457 -4.33013) (-4 5 4.33013) outlet 7120 7497 ok (non-closed singly connected) (7 0.03457 -4.33013) (7 5 4.33013) innerWall 3600 3801 ok (non-closed singly connected) (-4 0.03457 -0.05988) (7 0.06914 0.05988) outerWall 3600 3801 ok (non-closed singly connected) (-4 2.5 -4.33013) (7 5 4.33013) rightWall 64080 64617 ok (non-closed singly connected) (-4 0.03457 0.05988) (7 2.5 4.33013) leftWall 64080 64617 ok (non-closed singly connected) (-4 0.03457 -4.33013) (7 2.5 -0.05988) Checking geometry... Overall domain bounding box (-4 0.03457 -4.33013) (7 5 4.33013) Mesh (non-empty, non-wedge) directions (1 1 1) Mesh (non-empty) directions (1 1 1) Boundary openness (5.21284e-15 -1.33613e-13 3.22619e-14) OK. Max cell openness = 2.93221e-15 OK. Max aspect ratio = 132.092 OK. Minimum face area = 1.15788e-05. Maximum face area = 0.184686. Face area magnitudes OK. Min volume = 6.90037e-08. Max volume = 0.0466731. Total volume = 287.397. Cell volumes OK. Mesh non-orthogonality Max: 41.6624 average: 9.46642 Non-orthogonality check OK. Face pyramids OK. Max skewness = 0.29358 OK. Coupled point location match (average 3.61322e-06) OK. Face tets OK. Min/max edge length = 0.00332535 0.55376 OK. All angles in faces OK. Face flatness (1 = flat, 0 = butterfly) : average = 1 min = 1 All face flatness OK. Cell determinant (wellposedness) : minimum: 6.52518e-06 average: 1.23701 ***Cells with small determinant (< 0.001) found, number of cells: 52482 <<Writing 52482 under-determined cells to set underdeterminedCells Concave cell check OK. Failed 1 mesh checks. End Also I found this thread, where the error "cannot find points in pts1" is asked about: http://www.cfd-online.com/Forums/ope...er-errors.html Does anyone have an answer on that topic? It would help me understanding the cause of the error I get when I run snappy. Looking at the snappy error posted earlier, I noticed, that only the x-coordinates of the tested points (which points are they and what are they tested for???) are causing the mismatching error. Any thoughts on that? Some other thoughts and actions of mine: - increasing write precision in controlDict to 10 did not help. - Do I somehow have to define, that the cyclic patches (which should have exactly the same sizes) are rotated towards each other? Or does blockMesh recognize it on itself? Thanks and best regards Julian Last edited by Ruli; December 9, 2013 at 09:24. |
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