[TheLearner]

Hello dudes!
I am a begineer in CFD, and I am simulating a retangular enclosure enviroment with forced convection of air. The geometry domain has just one inlet and one outlet.

My boundary conditions are: at the inlet I set the velocity and the turbulent parameters. At the walls I set temperature constant. At the outlet I set the Static Pressure.

My great doubt is about the static pressure at the outlet. My intention is that this outlet simulate na entrance of na air-conditioning system, and my inlet would be the exit of the air-conditioning system.

The question is: Would this outlet pressure be a negative pressure? Or must I set this static pressure as zero? What would be a better practice?

If someone already worked in a problem like this, please help me.
Thank you very much