fsi simulation-convergance question
 

I am simulationg 3D transient fsi around a hydrofoil. Among all the time steps, there are only a few in the middle of my simulation which are not fully converged in the interface-loads. (i mean the convegence value of the interface loads is not negative)
Do you think it is important? if yes, what is the solution? I have decreased the time step (Courant=5) but still the same issue.
Thanks