Take a U-shaped piece of pipe, standing upwards. Fill the bottom part with liquid and leave the 'prongs' open. Now slam a parcel of liquid into one end at high speed. The other end will experience some momentum exchange and go pushed upwards. Now take the same test case and add some piping that comes from the bottom of the U. That piping is full of fluid and stretches out into a complex branch of piping. That piping has various openings where water could get pushed upwards if it received a force. So the piping looks like this from the side: | | | | |---|---------|----------------| ... complicated pipe branch with some openings. Only the bottom level is full in this scenario. My question is, if you send in a high velocity parcel of liquid into one of the prongs, it will have a very small effect on the other prong. That is because the force of the collision gets spread out to the entire piping system. So if there are a total of 100 openings along the pipe then the open prong of the U shape will only get 1/100 of the force. It will barely move. But in real life you would imagine that dynamic pressure force would somehow move the fluid that is closest to it. So it would have a large impact on the close prong and not much impact further down the complicated piping. I know I'm doing a lot wrong here and this is for a simplified simulation, but would appreciate any guidance.