Konstantine Kourbatski
Ansys Employee
Knowing velocity of the water approaching the bridge and size and weight of the debris, you can assume the debris is moving at the speed of water when it hits the bridge, and then use basic laws of mechanics to estimate transfer of momentum from the debris to the bridge and resulting force.nIf your objective is to simulate impact physics, then you may consider another Ansys tool like LS-Dyna or ICFD.n