CFD Online Discussion Forums - [Commercial meshers] Problem with cyclic BC's using Pointwise (non-orthogonality error!)

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! :)