I'm wondering if anyone knows of a way which utilizes the perforated plate function within Flow, to run a simulation showing air flow thru a perforated plate which is inside of a piece of ductwork?  From what I am seeing, the only way you can assign a particular surface the properties of a perf plate, is to have it be either designated as a fan or environment pressure first... neither of which are accurate assumptions in this case. My preferred output would be to show air diffusion (on both sides of the perf) within the duct as well as any pressure differential on the system.

Thanks for any thoughts you may have