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RelativeVelocityModel explained for DriftFluxFoam

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Old   September 28, 2023, 04:48
Default RelativeVelocityModel explained for DriftFluxFoam
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Dear all,

While doing a driftfluxfoam simulation I want to determine which relative velocity model I want to use.
I was wondering about a couple things, first of all, I saw this in a tutorial:

relativeVElocityModel simple;

V0 (0 -0.002 0)
a 285.84
a1 0.1
residualAlpha 0

Now when I look at the openfoam manual I see the equation for the simple and general model, however I don't see an a, a1 or residualAlpha variable, where do these come from and how are they being used?
My second question is about the following line:
What does this line do and how does it affect the equation for the simple model?

Thank you in advance
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Old   January 29, 2024, 18:14
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You might get some info from the above link.
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driftfluxfoam, relative velocity, transport properties

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