Convergence issues with long period sloshing flows
Does anyone know any tricks to get my solution to converge for a long period (~15 secs) sloshing flow? The excitation of the domain is just some A * sin (2*Pi/T * time). If my period is long then the solution (moment time history) doesn't look smooth. If I shorten it then things look great and match theory. Any suggestions?

Re: Convergence issues with long period sloshing f
By period do you mean the flow time? In this case the moment time history couldn't look smooth because of nonlinear effects due to the interaction between the frequency 1/T of your excitation and the natural frequency of the fluid in the tank. As long as your solution converges well (preferably within 10 or less iterations) every time step, I never found unrealistic results...
Hope this helps Edi. 
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