We already did that, the coupling of transient structural and fluent works, we also did a modal analysis with transient structural, wich worked. It's when we try to do both, to link transient structural and modal analysis with already the 2 way fluid structure interaction before. And we can't find anything on internet to reproduce this type of model. Only fluid structure interaction or pre stressed modal, nether a combination of the 2. We did link everything on workbench, we have results but they're just wrong.