Hello, is it possible to add CSG geometry (such as a box or plane for boundary) to .stl file? I imported the .stl file via netgen.stl and being able to mesh it and save as .vol file but to perform Navier Stokes simulation via the geometry, I need to add box like geometry for boundary. You can have a look at the .stl file.
https://ngsolve.org/media/kunena/attachments/1379/image.stl
https://ngsolve.org/media/kunena/attachments/1379/image.vol
Attachment: image.stl
Attachment: image.vol