I have made a demo project for this question: SimScale
This project has two tanks connected by two pipes of different diameter. There is a pressure boundary condition on each tank causing air to flow between the tanks.
Is there a way I can calculate (like with a Result Control β Surface Data β Area Integral) the flow through each pipe?
Well, the only thing I could think of at the moment would be to create a geometry primitive (thin cylinder) and virtually cut through the tube, I am not 100% sure if you can add that for area integral in the result control tab meaning that you can assign a geometry primitive to it, would have to check that myself.