Reply To: Fluent intrinsic FSI, negative cell volumes in the solid body

[rssastry]

The solid body motion is result of FE solution and comes automatically. Cannot control it in any manner. The point is that the FE solution should not give you any non-physical results. Again, the problem is maybe not where one may be thinking and could be elsewhere. The only mechanical solution will not show the problem because it does not have a full coupled mesh and therefore negative volume at the interface would not be reported. One way to also check is the FE solution in intrinsic FSI correct is to perform as with mechanical 1-Way FSi solution and to compare such results with Mechanical.

Also on other suggetions is to check if the material properties are realistic - a real material should not behave like this. As solid nodes position is coming from intrinsic solver, this check may help.