Reading Fluent mesh warnings and erros

[giannoko]

Hi,

I am reading a mesh exported from ANSYS Fluent in .msh format with pyvista.read("mesh.msh"). I am getting a lot of warnings like these

Warning: Unknown index 4. Skipping.
Warning: Unknown index 11. Skipping.
Warning: Unknown index 11. Skipping.
Warning: Unknown index 11. Skipping.
Warning: Unknown index 316. Skipping.
Warning: Zone specification not supported yet. Skipping.
Warning: Zone specification not supported yet. Skipping.
Warning: Zone specification not supported yet. Skipping.
Warning: Zone specification not supported yet. Skipping.
Warning: Zone specification not supported yet. Skipping.
Warning: Zone specification not supported yet. Skipping.
Warning: Zone specification not supported yet. Skipping.
Warning: Unknown index 38. Skipping.
Warning: Unknown index 60. Skipping.
Warning: Unknown index 73. Skipping.

Although I can display the mesh, when I print the cell quality based on "skew", I got values of -1. According to documentation this means that "Cell types not supported by this filter or undefined quality of supported cell types will have an entry of -1." The elements are tetrahedrons. I attach the mesh file in .txt format because I am not able to upload a .msh file. How can I compute and display the cell quality based on skewness for this mesh?

Thank you
mesh.txt

[MatthewFlamm]

This is a mesh format that is not directly supported by PyVista. See https://docs.pyvista.org/api/readers/_autosummary/pyvista.get_reader.html#pyvista.get_reader. If the mesh format isn't directly supported, it is attempted to read in by meshio https://github.com/nschloe/meshio. So the warnings you see and the behavior is coming from meshio. However, Im not sure whether this is a bug/missing feature in meshio or in the translation to the pyvista representation. Maybe others would know.

I don't immediately see a vtk reader for this format, so I don't think pyvista can directly support this format. Since you mention exporting from Fluent, you can also try to load in using a .cas file, for which there is existing support.

[giannoko]

Hi @MatthewFlamm. This is a meshio problem since I got the same warnings using the meshio reader out of PyVista. Although I translated the .msh file to .vtk file through meshio, I do not see any warning with PyVista reader but I still cannot plot the skewness propecrly (still values of -1).

[MatthewFlamm]

This sounds like a meshio problem to me unless the data is correct in meshio but gets corrupted when translating to pyvista. If it is indeed a meshio problem, it would be best to report there.

[giannoko]

Thank you @MatthewFlamm I will report this to meshio.