Reply To: Negative Cell Volume detected in Dynamic Mesh.

[Federico]

Would be best if you posted your screenshots directly on the post, as I cannot use your links.

To answer your question, it depends on the topology of your problem. Smoothing/Remeshing may occur on some adjacent zones to the FS-interface (e.g. the interior zone wherein this interface moves into does not require any dynamic mesh zone definition).

You can find here a summary of troubleshooting steps that you may take for an unstable FSI simulation: How can I converge an unstable FSI or 6DOF case in Fluent - Ansys Knowledge