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How to calculate the flux of this term grad(alpha1)*alphaf*U?

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Old   June 6, 2016, 10:42
Default How to calculate the flux of this term --- grad(alpha1)*alphaf*U?
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David Long
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Hi Foamers,

I am working on a modified solver based on interFoam, having problem to calculate the flux of the following term (in modified VOF method):



where alpha1 is the liquid phase volume fraction, alphaf the fluid volume fraction, and U the fluid velocity. The term alphaf is introduced because there is a third phase: solid.

To calculate the flux of this term, I tried the following code:
Code:
volVectorField afGrada1("afGrada1", alphaf*fvc::grad(alpha1));
//volVectorField afGrada1("afGrada1", alphaf*fvc::snGrad(alpha1));
surfaceScalarField afGrada1Uf(fvc::interpolate(U*afGrada1) & mesh.Sf());
But it seems that there is a problem on the gradient of alpha1.

Code:
alphaEqn.H: In function ‘int main(int, char**)’:
alphaEqn.H:16:69: error: no matching function for call to ‘Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh>::GeometricField(const char [9], Foam::tmp<Foam::Field<double> >)’
 volVectorField afGrada1("afGrada1", alphaf*fvc::grad(alpha1));
                                                             ^
alphaEqn.H:16:69: note: candidates are: ...........
I have tried a lot of combinations, but none is working. Any idea to calculate the flux of alphaf*grad(alpha1)*U?

Thanks in advance.

David

Last edited by keepfit; June 7, 2016 at 04:53.
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discretisation, flux calculation, interfoam, vof method

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