[irrlicht96]

I have a box with a mass flow inlet and outlet next to each other on the same side. Around this box is a huge enclosure (cuboid) and I want to simulate the overall flow pattern inside the enclosure. I don't know where the air for the box inlet gets sucked in from nor where the air from the box outlet leaves the enclosure.

So I think I need to set the BCs of the enclosure walls as inlet & outlet at the same time because both are possible. I am new to CFD in general, so I am a little bit lost.

Right now I radomly put pressure inlets & outlets on the enclosure walls. I get "Reversed flow"-errors during the simulation, I guess that makes sense due to the situation I described above. But I am not sure if it's right...