Liquid/liquid dispersion

Michael

Hi,

I wish to model a horizontal open pipe which is filled with fresh water sitting in a large tank of seawater. The system is static but i want to model the movement/migration of liquid in and out of the pipe based on the density gradient.

What boundary conditions do i need to specify as there is no velocity or pressure boundaries in the model?

How do i create two zones in the geometry so that there is free movement between the fluids in and out of the pipe?

Any help is much appreciated.

Thanks in advance, Michael.