[mengyue1]

hi all, the case i am studying now is that, the pressure of a 2-D room made of concrete is -620Pa, and the pressure outsie is 1atm. Because of the pressure difference between the walls, there is air flowing into the room through concrete wall. To maintain the subpressure in the room, there is an exhaust fan venting the air. So, to simulate this case, i want to set the concrete wall as porous media, and also set an exhaust fan in my simulation. Is that right? And how i set the parameters of the porous media，should i set the wall as presssure inlet and how i can set the pressure of the room is -620Pa？
Thanks for your help！