Stratified Two Phase Flow
I am an undergraduate and beginner of this software FLUENT and currently working on stratified two-phase simulation in 3d geometry.
My problem is that I have a cylindrical pipe and I have to analyse the velocity profile when the flow is fully developed, so I am working on Laminar, steady state conditions. Although, the problem is not realistic but still, this is the beginning step to learn so that later I can solve realistic two phase turbulent flows in pipes. In my case, I know the inlet and outlet pressures and the interface level between the two phases is constant along the length of the pipe. So, I am unable to decide which model should I use - VOF or Eulerian and how to define the boundary and interface conditions.
Fluent user manual says that for stratified multiphase flow, we should use VOF model but I am not able to figure out how to define the interface level (which is kept constant) such that there is complete separation of two phases.
I suggest you to go through the VOF Fluent tutorial. It clearly explains how to model the interface and other details. You need to create a register (region) for a particular phase and patch that region with volume fraction value of 1.
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