[Nek5000-users] Mesh morphing

[nek5000-users at lists.mcs.anl.gov]

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