Reply To: Two-way FSI: excessive thickness change

[Rahul]

If it is confidential data, do not share. 

Check your BCs, and material properties. 
The default value of the scale factor might not work. This factor will be different for different time steps or for a different case. 

Always start with small values then increase. (Note that pressure response is a function of scale factor and Number of Fluent iterations per coupling step). So in practice, consider using a small number of Fluent iterations between each mesh update.