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divergence in two-phase air-water flow in vertical-horizontal elbow

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Old   January 10, 2019, 08:27
Default divergence in two-phase air-water flow in vertical-horizontal elbow
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elahe mirzade
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I am working on a tow-phase air-water flow in an elbow. The interFoam is implemented for simulation. In zero time the elbow is full of water, and then from inlet both water and air are injected. There is gravity in the opposite direction of inlet flow . My problem is that the gas flow does not go out from outlet. It goes next to the outlet and then divergence occurs.
I don't know if the problem is with p_rgh or alpha boundary conditions or something else. Some of them written below. Air is injected from inlet1 and water is injected from inlet2.

I would be thankful if anyone could help. Thank you

boundary condition for p_rgh is:

internalField uniform 0;

boundaryField
{
inlet1
{
type zeroGradient;
}

inlet2
{
type zeroGradient;
}

outlet
{
type fixedValue;
value uniform 0;

}

Wall
{
type fixedFluxPressure;
gradient uniform 0;
value uniform 0;
}
}

boundary condition for water phase fraction(alpha.water) is:

internalField uniform 1;

boundaryField
{
inlet1
{
type fixedValue;
value uniform 0;
}

inlet2
{
type fixedValue;
value uniform 1;
}

Wall
{
type zeroGradient;
}

outlet
{
type inletOutlet;
inletValue uniform 0;
value uniform 0;
}

}
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air, elbow, interfoam, openfoam, water

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