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Closed Renumbering mesh results in high non-orthogonality and skewness
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  • Renumbering mesh results in high non-orthogonality and skewness

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    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

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