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.
Hi @DaleKramer
Just perform a pressure driven analysis, Just apply three B.C pressure inlet and pressure outlet and walls condition. For more go through the link.
I have tried again the simple and obvious ‘Pressure Driven Analysis’ setup (this sim run is still there), with Inlet face set to 961Pa and the Outlet face set to Mean pressure of 0 Pa and the sim run looked to be converging (albeit at much higher residuals than I like) but the Area averages on the plenum Faces is just not right and it eventually diverged on all faces (including the Inlet and Outlet faces)
I am using ‘New Mesh Preview’ for my meshes but maybe I will go back to Hex Parametric and see if that helps…
No, just what my brain expects and that is not often correct
I expect that since the exit is 100x the area of the inlet, that all the wall area averages will have an average pressure significantly lower than 961 Pa… (in the area of ~10 Pa which is 100x less than inlet pressure) …