[mathmech]

So there are two cases available:

1. multiphase/interfoam/laminar/wave which creates waves by oscillating wall BC in the fluid domain
2. we have created another case which inserts rectangle to this fluid domain. Now, it can only heave not pitch and there are no waves. We simply give the rectangle initial displacement or initial velocity and let it heave

I want to release pitch DoF of the rectangle and want to add oscillating wall BC back. Should I only change U and pointdisplacement or there is more to do?