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Multiphase Simulations - Boundary Conditions for Phase Fraction

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Old   December 30, 2019, 10:47
Default Multiphase Simulations - Boundary Conditions for Phase Fraction
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Hello,

I use twoLiquidMixingFoam solver in OpenFOAM. In my setup, I have a single inlet and two outlets as shown in the attachment. The two fluids are expected to mix and exit through the outlets.

I am wondering what would be the boundary conditions for the alpha phase in this case.

I use zeroGradient or inletOutlet. Initially, it works fine since only single phase exists at the outlet boundary. However, when a mixed phase reaches the outlet boundary, I get some vortices (see attachment).

In the zero directory, I have three files only; p_rgh, U and alpha.phase1.

I would appreciate any assistance.

Thanks.
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Old   January 13, 2020, 10:32
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Dear All,

I would appreciate any assistance.

Thanks in advance.
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