Hello everyone:
     I am a mechanical engineering student,I have no idea about setting boundary condition,

what are the difference when I setting pressure opening for : environment pressure , static pressure and total pressure ?
My case is evacuating Nitrogen from a chamber. The inlet flow is set volume flow 0.000333 m^3/s at 303K, 0.2MPA ?
Which PRESSURE type should I use??????  The pump at outlet could be at 0.001 MPA.
THANKS!!