Stratified Two Phase Flow

ravi1650 · May 25, 2009, 16:11

Hi,

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.
Please help.
Thanks

anupamjain76 · May 29, 2009, 06:13

Hi,

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.

Anupam

May 25, 2009, 16:11	Stratified Two Phase Flow	#1
ravi1650 New Member Ravi Kapoor Join Date: May 2009 Posts: 6 Rep Power: 17	Hi, 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. Please help. Thanks

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May 29, 2009, 06:13		#2
anupamjain76 New Member Anupam Jain Join Date: May 2009 Posts: 5 Rep Power: 17	Hi, 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. Anupam