Dear Neks, I thought this question might be of interest for someone else as well, so posting it here: I have been looking at the oscillating cylinder example. I would like to do something similar, but instead of a prescribed boundary velocity, would like to prescribe a given displacement of one boundary, and morph my mesh smoothly everywhere to match this displacement. For example, if one were to describe a deformation of the cylinder rather than a velocity (but without altering the other boundaries and without scaling the mesh). This just needs to be done once, not at every time step. Is there an easy way to do this? Can I arrive there somehow by minor modifications of the elasticity solver? What equation exactly is the elasticity solver solving at every time step? (When I outputted the files after every time step for the oscillating cylinder, the mesh deformation seemed to match the prescribed one only after 2 time steps. Is there a reason for this, or did I do something wrong?) Best regards, Outi