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

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November 16, 2014, 18:12
Problem with cyclic BC's using Pointwise (non-orthogonality error!)
#1
Member

Daniel
Join Date: Jun 2014
Posts: 60
Rep Power: 5
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!
Attached Images
 cube_mesh.png (53.1 KB, 12 views)

 November 17, 2014, 16:23 #2 Member   Daniel Join Date: Jun 2014 Posts: 60 Rep Power: 5 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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