[mariposa]

I recently want to simulation an axial fan that work like wind tunnel so the input pressure is negative and the output pressure is positif. I also want to input mass flow 32.5 kg/s.
But the problem is, i've trying to make the boundary inlet is mass flow but its still goes false, while the result in input and output get exchange.
Honestly i still confuse how to use boundary condition, like pressure inlet, velocity inlet, massflow, exhaust fan, intake van and also function each of them.
I really need your help guys, please help me.
Thank you