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November 5, 2013, 11:02 |
round tube - checkMesh error
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#1 |
New Member
klemen
Join Date: Aug 2012
Location: Slovenia
Posts: 26
Rep Power: 13 |
When i made a straight tube and "checkMesh" i receive no errors. But when i add a 90° round tube on top, "checkMesh" returns 4 errors (please see below). I made a round tube using this instructions: http://www.cfd-online.com/Forums/ope...blockmesh.html
When i run paraFoam, everything looks nice. I tried to change the tube grading but this didn't solve the "High aspect ratio" problem. I have no idea how could i solved the non-orthogonality error - isn't this obveous that the faces will be non orthogonal if the tube is not straight? Any idea how can i solve this problem? Regards Klemen -------------------------- Checking geometry... Overall domain bounding box (-0.008 -0.00654102 0.002) (0.00654102 0.00654102 0.0339986) Mesh (non-empty, non-wedge) directions (1 1 1) Mesh (non-empty) directions (1 1 1) Boundary openness (-1.31732e-17 1.60882e-17 2.02306e-16) OK. ***High aspect ratio cells found, Max aspect ratio: 7.93329e+192, number of cells 330 <<Writing 330 cells with high aspect ratio to set highAspectRatioCells Minimum face area = 1.05207e-23. Maximum face area = 6.85601e-07. Face area magnitudes OK. Min volume = 1.66667e-300. Max volume = 1.87778e-10. Total volume = 2.065e-06. Cell volumes OK. Mesh non-orthogonality Max: 180 average: 17.3038 *Number of severely non-orthogonal faces: 478. ***Number of non-orthogonality errors: 1103. <<Writing 1581 non-orthogonal faces to set nonOrthoFaces ***Error in face pyramids: 2244 faces are incorrectly oriented. <<Writing 1189 faces with incorrect orientation to set wrongOrientedFaces ***Max skewness = 8.04445, 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 4 mesh checks. |
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November 13, 2013, 02:46 |
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#2 | |
Member
Dr. B T KANNAN
Join Date: Jul 2011
Location: CHENNAI (MADRAS), INDIA
Posts: 55
Rep Power: 14 |
Quote:
Try increasing the number of cells in the round tube. -- KANNAN |
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July 9, 2014, 06:54 |
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#3 |
New Member
Ali Heidari
Join Date: May 2013
Location: Tehran,Iran
Posts: 6
Rep Power: 12 |
hello klemen.
i have the same problem. can you solve this problem?? Thanks. Regards |
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July 9, 2014, 15:17 |
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#4 |
New Member
klemen
Join Date: Aug 2012
Location: Slovenia
Posts: 26
Rep Power: 13 |
Hello Ali,
I think i solved the problem by defining the circle (tube cross section) from five patches - a square in the middle and four curved trapezoids around the square. I don't have the access to my computer at the moment, but i can check it next week - let me know if you don't succeed. Regards Klemen |
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July 10, 2014, 06:27 |
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#5 |
New Member
Ali Heidari
Join Date: May 2013
Location: Tehran,Iran
Posts: 6
Rep Power: 12 |
Thank you very much Klemen.
My blockMesh file is: code: Code:
/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.2.1 | | \\ / A nd | Web: www.OpenFOAM.com | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class dictionary; object blockMeshDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // convertToMeters 0.01; vertices ( (0 8 2) (10 0 1.5) (10 3 2) (1 8 2) (0 8 0) (10 0 0.5) (10 3 1) (1 8 0) ); blocks ( hex (0 1 2 3 4 5 6 7) (40 15 10) simpleGrading (1 1 1) ); edges ( ); boundary ( inlet { type patch; faces ( (0 4 7 3) ); } outlet { type patch; faces ( (1 2 6 5) ); } Wall { type wall; faces ( (0 1 2 3) (4 5 6 7) (3 2 6 7) (0 1 5 4) ); } ); mergePatchPairs ( ); // ************************************************************************* // Code:
Checking geometry... Overall domain bounding box (0 0 0) (0.1 0.08 0.02) Mesh (non-empty, non-wedge) directions (1 1 1) Mesh (non-empty) directions (1 1 1) Boundary openness (5.08774e-17 -1.73343e-16 -2.05592e-16) OK. ***High aspect ratio cells found, Max aspect ratio: 2.76503e+194, number of cells 6000 <<Writing 6000 cells with high aspect ratio to set highAspectRatioCells Minimum face area = 8.95863e-07. Maximum face area = 6.3631e-06. Face area magnitudes OK. Min volume = 2e-300. Max volume = 2e-300. Total volume = 1.2e-296. Cell volumes OK. Mesh non-orthogonality Max: 180 average: 157.305 ***Number of non-orthogonality errors: 16850. <<Writing 16850 non-orthogonal faces to set nonOrthoFaces ***Error in face pyramids: 36000 faces are incorrectly oriented. <<Writing 19150 faces with incorrect orientation to set wrongOrientedFaces Max skewness = 3.57447 OK. Coupled point location match (average 0) OK. Failed 3 mesh checks. End But when i change the vertices(while the geometry remain approximately constant), like this : vertices ( (-5 4 0) //0 (0 -1 0) //1 (0 0.5 0.5) //2 (-4 4 0) //3 (-5 4 2) //4 (0 -1 0.5) //5 (0 0.5 1) //6 (-4 4 2) //7 ); everything is ok. I'm confused. I don't know how i solve this problem. Do you know how solve this problem? Thank you very much for your help. Best regards, Ali |
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