Not in your case .. in your case, the wall is moving parallel to the domain. So, what will the solver do is to give the same velocity for the fluid at the wall, No slip condition. So, you can actually test if it is working or not by monitoring the fluid velocity near the wall and it should have oscillating velocity similar to the force with a time lag.nnRegarding converting the force into velocity, the results will be more accurate only in one case; if you want to consider the fluid forces on the wall ... SDOF_PROPERTIES will take this into consideration. n