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Problem with cyclic BC's using Pointwise (non-orthogonality error!)

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Old   November 16, 2014, 18:12
Question Problem with cyclic BC's using Pointwise (non-orthogonality error!)
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Daniel
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Hello Foamers,

I am using OF 2.2.0 and meshing in Pointwise V17:R2 . I meshed a 16 X 16 X 16 cube in Pointwise and used the Create -> Periodic -> Translate/Rotate option to create my patches and then finally gave the BC to all faces as cyclic in Pointwise.

A view of the mesh is attached.

However when I export the mesh to OpenFoam, I get the following error in my checkMesh output:

Code:
Checking patch topology for multiply connected surfaces...
    Patch               Faces    Points   Surface topology                  
    side1               225      256      ok (non-closed singly connected)  
    side2               225      256      ok (non-closed singly connected)  
    side3               225      256      ok (non-closed singly connected)  
    side4               225      256      ok (non-closed singly connected)  
    side5               225      256      ok (non-closed singly connected)  
    side6               225      256      ok (non-closed singly connected)  

Checking geometry...
    Overall domain bounding box (-0.00375 -0.00375 0) (0.00375 0.00375 0.0075)
    Mesh (non-empty, non-wedge) directions (1 1 1)
    Mesh (non-empty) directions (1 1 1)
    Boundary openness (-4.42339e-17 -4.42339e-17 -7.8429e-18) OK.
    Max cell openness = 1.05879e-16 OK.
    Max aspect ratio = 1 OK.
    Minimum face area = 2.5e-07. Maximum face area = 2.5e-07.  Face area magnitudes OK.
    Min volume = 1.25e-10. Max volume = 1.25e-10.  Total volume = 4.21875e-07.  Cell volumes OK.
    Mesh non-orthogonality Max: 180 average: 29.2518
 ***Number of non-orthogonality errors: 1350.
  <<Writing 1350 non-orthogonal faces to set nonOrthoFaces
    Face pyramids OK.
    Max skewness = 0.126269 OK.
    Coupled point location match (average 5.50098e-19) OK.

    Failed 1 mesh checks.
Why am I getting the error about non-orthogonality. What is non-orthogonal in a structured mesh for a cube ? Is this something to do with how Pointwise exports meshes to OpenFoam?

Any help would be really appreciated . Thanks!
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File Type: png cube_mesh.png (53.1 KB, 4 views)
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Old   November 17, 2014, 16:23
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Daniel
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I found a way out of this. Pointwise has a problem with exporting cyclic patches to OpenFoam. To get around this error just type "renumberMesh -overwrite" before "checkMesh" and the errors will disappear
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