Maintaining pressure inside a room
 

Hi,

I am trying to maintain a certain pressure inside a room(zone) in Fluent. I have been doing this using the patch feature however after so many iterations(transient) the pressure equalizes with the operating conditions, I have tried to use a pressure inlet/outlet to assist with this however the pressure just keeps increasing. Is there a way to solve this?

Thanks

What is the reason that the pressures is increasing?

Is that physical (you have mass flow inlet) or because of numerical problems?

I have tried multiple methods, in one method I have put in a pressure inlet set at the desired pressure inside the room, and set an outflow also, obviously more air is coming into the room then out so the pressure is increasing. I simple want to maintain a pressure in a room.