Interior flow

Zen

Hi

Can anyone tell me how to get the internal flow volume for Gambit 2.2 from mask created by ProE/wildfire? The face mask has a thickness of 2.5mm, and it's too complicated so I don't want to do it by Gambit, instead, I like to import it as a *.Step file.

I know how to do it for external flow, but still struggling on how to obtain the flow regime by Substraction or Split to get internal flow analysis when human is breathing.

If you can help, that's great

Zen