[sparta-users] collisional cell volume is zero when using re-meshed surf files

[Cosimo L. <cos...@as...>]

Dear Sparta developers.

I am finding some troubles when using an improved mesh for the surfaces files.

I wanted to improve the typical coarse triangulation from stl files with a standard triangulated mesh as the ones typical used for FEM calculations.
The reason is to be able to have better plots of surfaces quantities, as normal stl triangulation is quite awful for that.

I imported the CAD in an advanced CFD software with a powerful meshing tool, re-meshed, and exported a new stl file with the updated mesh.

The new stl file is successfully converted via the stl2surf.py script, and also imported in Sparta without errors.
The problem is that when I run the simulation, I get the following error:

ERROR: Collision cell volume is zero.

Can you help me in understanding why this is happening and how I can fix this problem?

Thank you in advance and best regards,
Cosimo
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