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#1 |
New Member
Sebastian Vetter
Join Date: Dec 2017
Posts: 9
Rep Power: 8 ![]() |
Hello all,
I am quite new to openFoam and I am having some trouble with my mesh. The checkMesh function tells me that I am having 3 errors with my mesh. According to my researches the urgent problem is the "Error in face pyramids". I checked my blockMeshDict almost 100 times but I didn't find the mistake. Maybe someone can help me. My blockMeshDict: /*-------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 4.1 | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class dictionary; object blockMeshDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // convertToMeters 0.001; vertices ( (0 0 0) //0 (110 0 0) //1 (125 0 0) (345 0 0) (345 1 0) //4 (125 1 0) (110 1 0) (0 1 0) (0 0 36.53) //8 (110 0 36.53) (125 0 34.6) (345 0 34.6) (345 1 34.6) //12 (125 1 34.6) (110 1 36.53) (0 1 36.53) (0 0 43.8) //16 (117.27 0 43.8) (345 0 43.8) (345 1 43.8) (117.27 1 43.8) //20 (0 1 43.8) (0 0 44.2) (117.27 0 44.2) (345 0 44.2) //24 (345 1 44.2) (117.27 1 44.2) (0 1 44.2) (110 0 43.8) //28 (110 1 43.8) (110 0 44.2) (110 1 44.2) ); blocks ( hex (0 1 6 7 8 9 14 15) (80 1 100) simpleGrading (1 1 1) //0 hex (8 9 14 15 16 28 29 21) (80 1 40) simpleGrading (1 1 0.2) //1 hex (9 9 14 14 28 17 20 29) (60 1 40) simpleGrading ( ((0.7 0.9 3) (0.3 0.1 3) ) 1 0.2 ) //2 //hex (8 9 14 15 16 17 20 21) (100 1 90) simpleGrading (1 1 1) hex (16 28 29 21 22 30 31 27) (80 1 10) simpleGrading (1 1 1) //3 hex (28 17 20 29 30 23 26 31) (60 1 10) simpleGrading ( ((0.7 0.9 3)(0.3 0.1 3) ) 1 1 ) //4 //hex (16 17 20 21 22 23 26 27) (100 1 60) simpleGrading (1 1 1) hex (17 18 19 20 23 24 25 26) (100 1 10) simplegrading (1 1 1) //5 hex (10 11 12 13 17 18 19 20) (100 1 90) simpleGrading (1 1 1) //6 hex (2 3 4 5 10 11 12 13) (100 1 100) simpleGrading (1 1 1) //7 ); edges ( arc 9 17 (113.635 0 42.826) arc 14 20 (113.635 1 42.826) ); boundary ( inlet { type patch; faces ( (0 7 15 8) (8 15 21 16) (16 21 27 22) ); } outlet { type patch; faces ( (3 4 12 11) (11 12 19 18) (18 19 25 24) ); } walls { type wall; faces ( (1 6 14 9) (2 5 13 10) (0 1 6 7) (2 3 4 5) (9 14 20 17) // vielleicht falsch (10 13 20 17)// vielleicht falsch (22 30 31 27) (30 23 26 31) (23 24 25 26) ); } empty { type empty; faces ( (0 1 9 8) (8 9 28 16) (9 9 17 28) (16 28 30 22) (28 17 23 30) (2 3 11 10) (10 11 18 17) (17 18 24 23) (7 6 14 15) (15 14 29 21) (21 29 31 27) (29 20 26 31) (14 14 20 29) (5 4 12 13) (13 12 19 20) (20 19 25 26) ); } ); // ************************************************** *********************** // The checkMesh Message: Create time Create polyMesh for time = 0 Time = 0 Mesh stats points: 71042 internal points: 0 faces: 140520 internal faces: 69420 cells: 35000 faces per cell: 5.99829 boundary patches: 5 point zones: 0 face zones: 0 cell zones: 0 Overall number of cells of each type: hexahedra: 34940 prisms: 60 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 inlet 150 302 ok (non-closed singly connected) outlet 200 402 ok (non-closed singly connected) walls 750 1504 ok (non-closed singly connected) empty 70000 71042 ok (non-closed singly connected) defaultFaces 0 0 ok (empty) Checking geometry... Overall domain bounding box (0 0 0) (0.345 0.001 0.0442) Mesh has 2 geometric (non-empty/wedge) directions (1 0 1) Mesh has 2 solution (non-empty) directions (1 0 1) All edges aligned with or perpendicular to non-empty directions. Boundary openness (7.90954e-19 3.57202e-13 7.55662e-17) OK. ***High aspect ratio cells found, Max aspect ratio: 2289.54, number of cells 2 <<Writing 2 cells with high aspect ratio to set highAspectRatioCells Minimum face area = 2.90059e-11. Maximum face area = 2.2773e-06. Face area magnitudes OK. Min volume = 2.90059e-14. Max volume = 7.612e-10. Total volume = 1.46389e-05. Cell volumes OK. Mesh non-orthogonality Max: 88.839 average: 18.4643 *Number of severely non-orthogonal (> 70 degrees) faces: 1101. Non-orthogonality check OK. <<Writing 1101 non-orthogonal faces to set nonOrthoFaces ***Error in face pyramids: 1 faces are incorrectly oriented. <<Writing 1 faces with incorrect orientation to set wrongOrientedFaces ***Max skewness = 6.57204, 7 highly skew faces detected which may impair the quality of the results <<Writing 7 skew faces to set skewFaces Coupled point location match (average 0) OK. Failed 3 mesh checks. End My geometrie: Thanks in advance! |
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#2 |
Senior Member
anonymous
Join Date: Jan 2016
Posts: 416
Rep Power: 14 ![]() |
Your blockMesh is ok. I mean you have no errors in it. But the mesh what you told it to generate is really bad. You should try to figure out a new blocking structure because this mesh has a really really poor quality. So much distorted cells and huge jumps in the cell sizes.
Screenshot from 2018-05-31 15-35-58.png Screenshot from 2018-05-31 15-36-15.png Screenshot from 2018-05-31 15-36-50.png |
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Tags |
checkmesh, mesh, openfoam |
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