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elebelly November 27, 2013 07:32

Failed checkMesh - ICEM converted mesh
 
Hi, I just converted my mesh (created on ICEM) however when I run the checkMesh command, it results in:

Checking geometry...
Overall domain bounding box (-11996.5928 -12000 -399.9727429) (20000 12000 399.9727429)
Mesh (non-empty, non-wedge) directions (1 1 0)
Mesh (non-empty) directions (1 1 0)
All edges aligned with or perpendicular to non-empty directions.
Boundary openness (-4.626143897e-18 -4.831227775e-18 -5.071408981e-19) OK.
***High aspect ratio cells found, Max aspect ratio: 11533.97369, number of cells 25089
<<Writing 25089 cells with high aspect ratio to set highAspectRatioCells
Minimum face area = 1.243221387e-05. Maximum face area = 303119.0509. Face area magnitudes OK.
Min volume = 0.009945093367. Max volume = 65443544.43. Total volume = 5.648098245e+11. Cell volumes OK.
Mesh non-orthogonality Max: 86.68018587 average: 9.268946233
*Number of severely non-orthogonal faces: 267.
Non-orthogonality check OK.
<<Writing 267 non-orthogonal faces to set nonOrthoFaces
Face pyramids OK.
Max skewness = 0.9275708721 OK.
Coupled point location match (average 0) OK.

Failed 1 mesh checks.

End

Why has it failed? And what can be done to resolve this?

Any help is really appreciated,

Ele

skyinventorbt November 27, 2013 08:44

Simple Solution
 
Quote:

Originally Posted by elebelly (Post 463722)
Hi, I just converted my mesh (created on ICEM) however when I run the checkMesh command, it results in:

Checking geometry...
Overall domain bounding box (-11996.5928 -12000 -399.9727429) (20000 12000 399.9727429)
Mesh (non-empty, non-wedge) directions (1 1 0)
Mesh (non-empty) directions (1 1 0)
All edges aligned with or perpendicular to non-empty directions.
Boundary openness (-4.626143897e-18 -4.831227775e-18 -5.071408981e-19) OK.
***High aspect ratio cells found, Max aspect ratio: 11533.97369, number of cells 25089
<<Writing 25089 cells with high aspect ratio to set highAspectRatioCells
Minimum face area = 1.243221387e-05. Maximum face area = 303119.0509. Face area magnitudes OK.
Min volume = 0.009945093367. Max volume = 65443544.43. Total volume = 5.648098245e+11. Cell volumes OK.
Mesh non-orthogonality Max: 86.68018587 average: 9.268946233
*Number of severely non-orthogonal faces: 267.
Non-orthogonality check OK.
<<Writing 267 non-orthogonal faces to set nonOrthoFaces
Face pyramids OK.
Max skewness = 0.9275708721 OK.
Coupled point location match (average 0) OK.

Failed 1 mesh checks.

End

Why has it failed? And what can be done to resolve this?

Any help is really appreciated,

Ele

Dear Ele,

"Try to increase the number of cells or reduce the grading" to avoid aspect ratio error.

--
KANNAN

Thangam December 11, 2013 03:53

Hi,

After the checkMesh, you could use foamToVTK utility to visualize all the non ortho faces and the high aspect ratio cells in paraview. In your case, run the command foamToVTK -faceSet highAspectRatioCells and this will create a VTK folder (which has the .VTK file) in your case directory which can then be visualized in paraview to see the cells containing high aspect ratio and you could rework/correct your geometry in ICEM if you want.(atleast you would know where the bad cells are!). You can repeat this for the non ortho faces as well.

good luck.


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