Firts of all, thank you for the answers! I will try to simulate this with the DPM + Species model after having reading up on DPM.
Like I wrote, this is a transient simulation of a real experiment and I have the right geometry. I know the feeding pressure, so I use pressure-inlet and gauge total pressure = feeding pressure. Outlet to atmosphere, so I use pressure-outlet with the default set up. Do you think, this is correct?
a picture of the chamber:
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