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Difference between homogeneous and in-homogeneous free surface model.

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Old   July 25, 2018, 04:11
Default Difference between homogeneous and in-homogeneous free surface model.
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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

Thanks in advance...
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Old   August 1, 2018, 03:27
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Questions:
1. I am confusing with homogeneous and in-homogeneous free surface model.which model to select?
It is well described in the CFX Theory Guide

2. Homogeneous and in-homogeneous model results are different with the same boundary conditions and mesh.
I assume your solution is not converged, I wouldn't invest much time in comparing

3. solution is not converging
Try to change the numerical setup between segregated and coupled, if air is compressible use incompressible setup first
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Old   August 1, 2018, 05:09
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Thanks Thomas,
i have changed a numerical setup from segregated to coupled as per your suggestion.
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