Thank you for looking at this problem.
I am not sure what you refer to when you say “the amount of boxes you have covered the polygon with”. Perhaps you refer to the mesh?
This is a mesh, imported as a unv file. A rather course mesh, made to test how simscale deals with imported UNV files and salome.
The model is a simple octagon in a cylindrical fluid body. The volume is partitioned in salome to create a central moving frame, and an outer stationary frame. This should be a pretty simple test case. Bottom surface is a symmetry plane. Meshed in Salome, imported to simscale. Once in simscale, it is not clear to me how to create cellzones and designate the MRF. Any way I try it, I get the same error, as noted above.
If there is an example of importing a unv and setting up a MRF problem, please let me know. I have not been able to find one. There are examples of importing geometry and meshing in simscale, then doing MRF, but this is not the functionality that I am testing.