Hi Rob, thanks for the fast reply!
I am quite new to ANSYS in general, so I am not certain I understand your response correctly. My idea was to create a UDF that would change the sample outlet surface from wall to pressure outlet after a set amount of time after starting the simulation. But since I am new I don't know if that's even the correct approach. And regarding your response, would a negative value make it cancel out the incoming flow creating a boundary for the time the sample is supposed to be closed in the beginning?
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