[yoooodarulez]

Dear all,

Im currently working on a project where i am supposed to compare CFD data against some empirical ones, regarding a very basic 2D hull (kind of) shape.

I am interested in acquiring the resistance force of the geometry used and also capturing the free surface area of the water.

To this end, im using the VOF model inside Fluent, while having a transient potential flow. My two fluids are air (primary phase) and sea water (secondary phase). Im using standard initialization with only air present in the whole computational domain and then i patch the water volume through the mark region option within the software. My computational domain extends to 5 Lpp upstream, 10 Lpp downstream, 3Lpp above and 5Lpp below my hull.

As boundary conditions im using velocity inlet (x-component) of 1 m/s (although it will be required to raise it) for both my air and water inlets, wall for the bottom of the domain, symmetry for the top part and outflow for both water and air outlet parts.

Although i seem to lack reverse flow phenomena with this kind of setup and the simulation seems to be physically correct up to some point, i do get my water surface level to be constantly rising and thus after some thousands of iterations my hull is completely submerged into the water phase.

Does this have anything to do with damping the waving activity? Do i have a cancellation in the energy conservation, of some sort?

Any suggestion on the matter?

Thank you in advance.
Nick