I'm studying about the boat. Can fluent simulate the boat that have 2 medias, air and water? How define the boundary conditions ? help me....

Before simulating the body decide what you want to exactly study. Fluent can perform multiphase analysis. Do not try to simulate the exact geometry instead first start your study with a simplified geomtry and look if you get the results which are acceptable within the limits of assumptions. Boundary conditions again depends on the exact problem being modeled.

-H

Hi

Try VOF (geometrical reconstruction), unsteady state, laminar/turbulent scheme.. Also you will have to have two inlets, one for air and the other for water. And similarly for the outlet. Define 'Velocity Inlet' BC at all these boundaries. Use 'Symmetry' BC along the plane of symmetry of the boat. Keep the rest of the boundaries i.e. top, side and bottom of the domain as 'Wall'.

Keeping all these in mind, you will have to develop a 3d model and then mesh it. For meshing unstructured grid (tetrahedral) would be fine.

Regards, Manoj