Can you give me a direct link to the mesh that this 2D image was extracted from 
(I would like to see those weird cells in a 3D viewer):
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Also, I have isolated another issue where meshing fails with a Floating Point Exception error when either an Inside Cartesian Box region refinement OR a Distance from surface face Region refinement is added around a geometry to increase mesh fineness around the vehicle…
Here is the project that shows the isolated issue and SimScale support is working in it now…