Rob
Ansys Employee
Not sure then, there shouldn't be any change in Fluent behaviour when hooked up to FSI but check your RAM & cpu load incase you're holding Mech or system coupling in the background. knows a lot more about this, I seem to cover multiphase & weird stuff in Fluent and have very little knowledge about how structures bend (I'm a Chemical Engineer so didn't do much solids at Uni). n