Renumbering mesh results in high non-orthogonality and skewness
When I run the
checkMesh utility in my case with the attached Grid
mesh.x, it reports the following values of non-orthogonality and skewness (See the
checkMesh.beforeRenumbering attached file for details):
Before running renumberMesh:
Mesh non-orthogonality Max: 36.0957 average: 9.08335 Non-orthogonality check OK. Face pyramids OK. Max skewness = 2.03538 OK.
But when I run the renumberMesh utility, then checkMesh, I get the following (see
checkMesh.afterRenumbering attached file):
After running renumberMesh:
Mesh non-orthogonality Max: 78.4614 average: 9.84955 *Number of severely non-orthogonal (> 70 degrees) faces: 26. Non-orthogonality check OK. <<Writing 26 non-orthogonal faces to set nonOrthoFaces Face pyramids OK. Max skewness = 3.322 OK. Coupled point location match (average 0) OK. Failed 1 mesh checks.
As you can see, the max skewness becomes 3.322, and the max non-orthogonality becomes 78.4614.
I wonder if this is a side-effect of renumbering the cells or is it a bug?
to convert the mesh.x to OpenFOAM format, use:
plot3dToFoam -2D 0.01 -noBlank mesh.x