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OpenFOAM UpdateCoeffs Nucleate Wall Boiling

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Old   July 31, 2016, 17:42
Talking OpenFOAM UpdateCoeffs Nucleate Wall Boiling
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Suneth Warnakulasuriya
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I'm really new to OpenFOAM, and I have two questions about the Nucleate Wall Boiling boundary condition [class] in the OpenFOAM-dev version.

1. In line 333, the updateCoeffs() function calls its' assignment operator by
A1*alphatConv_ + (Qq + Qe)/max(liquidw*hew.snGrad(), scalar(1e-16))
But, I coudn't find the declaration of the assignment operator for this class or any of the parent classes except for the class in fixedValueFvPatchField class which is blank virtual. What is the purpose of calling its' own assignment operator?

2. In line 361, the wall boiling boundary condition calls the following functionfixedValueFvPatchScalarField::updateCoeffs();.
What is the purpose of it? I couldn't find the declaration of this method as well. What is the purpose of this, what variables does it update?

3. This is considering the evaluation of boundary conditions of alphatWallBoilingWallFunctionFvPatchScalarField, this is a derived class of alphatPhaseChangeJayatillekeWallFunctionFvPatchSca larField , and the parent class says the value parameter is not essential. If that is the case, what does the solver check as to be full filled as the boundary condition?

I'm trying to implement Nucleate Wall Boiling RPI model boundary condition for a constant heat flux, not as a thermal diffusivity as a boundary condition. Any suggestions? Am I doing something wrong? I was able to modify the equations and run the simulations, but the answers are not what I expect.

Any help will be highly appreciated.

Thank you.
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nucleate boiling, rpi model

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