I have an inlet duct the I pressurize with a variable speed fan that draws in ‘outside’ air by increasing the rpm until the inlet duct pressure reaches 961 Pa.
The inlet duct goes into a large plenum that has an outlet hole (approximately 100x the area of the inlet duct) in it that vents to ‘outside’ air.
I would like to know the inlet duct air velocity and the average pressure in the plenum.
I have a test project setup for this, but I can not figure out the correct Inlet and Outlet boundary conditions to use.
Everything I have tried so far seems to result in area averages on all the plenum walls of 961 Pa which is not logically possible or the results diverge.
Any ideas on this one?