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[blockMesh] Very simple case, weird blockMesh |
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October 16, 2013, 04:51 |
Very simple case, weird blockMesh
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#1 |
Senior Member
Dongyue Li
Join Date: Jun 2012
Location: Beijing, China
Posts: 848
Rep Power: 18 |
Hi,
I want to create a box. My blockMesh code is: Code:
convertToMeters 1; vertices ( ( 581895 4785760 1038) ( 581895 4785760 1060) ( 581775 4785760 1060) ( 581775 4785760 1038) ( 581895 4785880 1038) ( 581895 4785880 1060) ( 581775 4785880 1060) ( 581775 4785880 1038) ); blocks ( hex (0 1 2 3 4 5 6 7) (10 20 20) simpleGrading (10.0 1 1) // hex (0 1 2 3 4 5 6 7) (6 6 6) simpleGrading (10.0 1 1) ); edges ( ); boundary ( maxX { type patch; faces ( (3 7 6 2) ); } minZ { type patch; faces ( (0 4 7 3) ); } maxZ { type patch; faces ( (2 6 5 1) ); } minX { type patch; faces ( (1 5 4 0) ); } minY { type patch; faces ( (0 3 2 1) ); } maxY { type patch; faces ( (4 5 6 7) ); } ); mergePatchPairs ( ); Code:
Checking geometry... Overall domain bounding box (581775 4.78576e+06 1038) (581895 4.78588e+06 1060) Mesh (non-empty, non-wedge) directions (1 1 1) Mesh (non-empty) directions (1 1 1) Boundary openness (4.04186e-17 3.46606e-17 0) OK. ***High aspect ratio cells found, Max aspect ratio: 2.11238e+201, number of cells 4000 <<Writing 4000 cells with high aspect ratio to set highAspectRatioCells Minimum face area = 3.22979. Maximum face area = 36. Face area magnitudes OK. Min volume = 2e-300. Max volume = 2e-300. Total volume = 8e-297. Cell volumes OK. Mesh non-orthogonality Max: 180 average: 180 ***Number of non-orthogonality errors: 11200. <<Writing 11200 non-orthogonal faces to set nonOrthoFaces ***Error in face pyramids: 24000 faces are incorrectly oriented. <<Writing 12800 faces with incorrect orientation to set wrongOrientedFaces Max skewness = 4.32531e-09 OK. Coupled point location match (average 0) OK. Failed 3 mesh checks. |
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October 16, 2013, 05:47 |
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#2 |
Senior Member
Join Date: Aug 2010
Location: Groningen, The Netherlands
Posts: 216
Rep Power: 19 |
Hi sharonyue,
probably the problem is that you ordered the vertices wrong, so your geometry looks somewhat like a sand clock. To check this you can type paraFoam -block and display your blockMesh file in paraview. With this information you should be able to rearrange your vertices correctly and get a satisfying blockMesh. kind regards Colin |
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October 16, 2013, 05:58 |
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#3 |
Senior Member
Dongyue Li
Join Date: Jun 2012
Location: Beijing, China
Posts: 848
Rep Power: 18 |
Thanks man, you are rite. I should rearrange my vertices. woo!
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