Negatively Pressurized Spaces in Sim CFD
 

Hello Everyone!

We are modeling the interior of a paint facility and are designing the building to be negatively pressurized so that the excess paint particles will be vented through sidewall-mounted exhaust grilles.

We've had a lot of success so far modeling the space but I was wondering if there is a way to trick the software so that we may simulate more air leaving the space then entering? It would more accurately depict amount and direction of "dirty" air that is sucked away from the body being painted.

I've found that the program really doesn't like unbalanced flows so we've only been able to define our exhaust airflow rates off of our supply flow rates.

Thank you and have a great day!