Free surface modelling

Shane Gillis

I am trying to model a hull as it passes through the water. What I am interested in is the bow wave that is caused by a bluff object passing through a viscous fluid. I understand how to setup the solution in Fluent, but I do not know how to model a free surface problem (i.e. set the boundary conditions) for Fluent 5.0. I can model my volumes, but how do I define and/or mesh what is air & what is water?

I am using Gambit for the modelling.

Any help would be appreciated.

Thank you.