[Hgholami]

Hi
In fluid solid interaction solvers partitioned method (such as fsiFoam, solids4Foam), for interaction uses relaxation factor, because the transferred forces to solid region lead to displacement of solid with neglecting fluid region. So the displacement transfers to fluid region with fsi relaxation factor, that displaces fluid interface in a small amount, again in loop of fluid-solid solvers, the force calculated and transfer to solid and calculate displacement, then difference of new displacement and previous displacement multiply with fsi relaxation factor and plus to previous displacement. if previous displacement was high, the new force reduce it and if previous displacement was low, it increases.
This method have potential error that should test different relaxation factors, number of loop, etc.
does any other methods for replacing?