depression

hello evebody,

At work, I use SolidWorks and the module "flow simulation". My goal to simulate a depression in a room (the pressure is under the environment pressure, maybe 950 hPa) but i've juste the two volumes flow rate, inlet and outlet..

2 questions : why i can't ? / how can simulate that?

thank you for help

ps : sorry for my bad english

SolidworksFlow Simulation