[paola.]

I have to analyze the effect of sea waves (short gravity waves on FLUENT) on a submerged float using a CFD-3D simulation. I tried different settings but the result is that there is a reversed flow and the turblent viscosity ratio is too hight. Can someone help me?

In FLUENT I set:
General --> Transient, gravity
Models --> Multiphase (VOF with open channel flow and open channel wave BC), viscous (k-w SST)
Materials --> air, water (compressible, liquid)
Boundary conditions: -inlet (velocity inlet (1.5 m/s), open channel wave BC (short gravity waves, wave height= 1.5 m, wave lenght= 3 m))
- sky (pressure outlet)
- exit (pressure outlet, open channel flow)
Cell zone conditions: numerical beach
Methods: pressure velocity Coupling SIMPLEC, Gradient Green-Gauss cell based, pressure PRESTO!, Momentum Secord order upwind, Volume fraction compressive, all the rest second order upwind.