[Faby]

Hello everyone,

I have two interface walls defined as dynamic mesh, that move as a rigid body according to an udf in a flow domain. The problem is in transient time.
When I try to compute the solution, the simulation stops with this error:

"Warning: no positive-volume exist.
Error: update-dynamic-mesh failed. Negative cell volume detected
Note: zone-surface: cannot create surface from sliding interface zone.
Creating empty surface."

If I see the mesh surrounding dynamic mesh zones (interface walls) it's deformed a lot. But, I don't know how to fix it and I can't understand the "Note".

Could anyone help me?

Thank you in advance.