Reply To: Adaptive time step for fluent in structural – fluent system coupling simulation

[Rob]

The Intrinsic FSI is fully coupled, it's just not as an advanced structural solver. 

Refining the mesh tends to need a smaller time step to avoid negative elements as one mechanism for their creation is a point/surface moving more than one cell size in one step. Also check for near wall-wall contact as that will give skew cells.