[chaitu1351]

Hi,

I am working on submarine in stratified fluid with three phase.

domains/blocks:
air domain
air fresh water interface domain (for finer mesh)
fresh water domain
fresh water and sea water interface domain (for finer mesh)
sea water domain

My boundary conditions are
front: velocity inlet (different inlets for different fluid domain)
back and top: pressure outlet (different outlets for different fluid domain)
bottom and side: wall with no slip condition

after simulation, I am getting backward flow from the outlet, which distorting the flow completely.

can anyone tell me how to rectify this or what conditions should change
i would also like to know how to apply open channel flow condition for three phase flow

Thank you