[Rajaero]

Dear all,
I am working on a multi phase problem of oil/air separation by gravity. this phenomena used in oil injected compressor tank (horizontal tank). i tried to solve this problem by (volume of fluid and homogeneous and in-homogeneous free surface model approach). please clarify the following questions.

Boundary condition:
Domain : air domain and oil domain
Interface : one fluid-fluid interface
Inlet : air/oil mixture
Outlet 1 : air outlet (opening pressure condition)
Outlet 2 : oil outlet (opening pressure condition)

Questions:
1. I am confusing with homogeneous and in-homogeneous free surface model.which model to select?
2. Homogeneous and in-homogeneous model results are different with the same boundary conditions and mesh.
3. solution is not converging
Note: i have posted this problem in cfx forum but no one give a suggestion. i hope someone help me with this.
Thanks in advance...