Skip to content

Renumbering mesh results in high non-orthogonality and skewness

Hello,

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?

Thank you

Note: to convert the mesh.x to OpenFOAM format, use: plot3dToFoam -2D 0.01 -noBlank mesh.x

Attached files:

mesh.x

checkMesh.beforeRenumbering

checkMesh.afterRenumbering