[Exodiah]

Hi, I would like to ask if it is possible to define a grid motion for a surface, and a different and separate grid motion for the adjoining cell domain?

That means, the surface will be deforming according to a function, and the cell domain deforming to another similar function. I have tried using two separate udfs to define the surface and corresponding cell domain, but the mesh updating at the start of the time step fails.

Should I only define a grid motion for the cell? But if so, what should be the appropriate setting for the surface in the dynamic mesh tab?

Appreciate any advice or comments.