I tried to simulate the flow through a perforated plate. At first I calculated a plate with one big hole for a specific pressure loss. Then I divided the one big hole in four equal holes to see the difference between those cases (and tried to show the results as a simulation). In the last step I want to put another an exact copy of this plate on the top of the other and twist them together to raise the pressure loss in steps. But the results for one plate are not making any sense for me. I see no flow through the plate. Is there something with the CAD or what is wrong?
Here is the link of this project: