hi I have a plate moving back and forth in a closed space. The shape of the plate is a ring, it is moving around an axis up and down. The pressure difference between the two sides is too big when the plate is moving, and hence the force on the plate. Now I want to make some holes in the plate in order to reduce the pressure difference between the 2 sides. Do i only have to calculate with the reduced surface (plate minus holes) or do i have to take other things into the calculations. I think the dimensions of the holes are important too, one big hole will be different as several small holes. Any suggestion how to simulate this before drilling holes? thanks!