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I create 3D model from Autodesk Revit.
It's very long tunnel. (20km).
then I send it to CFD by extension.
but geometry error. I cannot create air volumn. Tunnel is also broken.
any advise me, please.
This may not be relazted to physical size.
Ensure that your Geometry is clean coming from Revit. (Take a note of the Help section about AEC models from Revit and model integrity).
At that scale, interferences could pose problems especially if they are small (less than 0.5m in length)