[paulmer]

Hey everyone,

I am trying to perform a two way fluid-mechanical coupling. In Fluent there is an incompressible oil with one coupled wall. In mechanical this wall consists of a hyperelastic material. I am transferring a force and a displacement. My task is to drain the Fluidvolume and track the deforming wall.

The problem is that a slight change in the fluidvolume leads to a massive pressure gradient. This is deforming my wall, which leads to an even higher volume change and higher pressure. In the end i receive the error highly distortet elements.

I tried to lower the timesteps, i removed gravity, i changed my outlet to wall. As a result i have a complete static fluidvolume, but its still the same error. Everything works fine when i use air as my fluid (compressible, low viscoity).

Do you have any suggestions? Maybe there is a way of transferring volume instead of force? Any ideas are more than welcome

Thanks a lot in advance
Paulmer