correctAlpha.C

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#include "isothermalFilm.H"
#include "surfaceTensionModel.H"
#include "constrainHbyA.H"
#include "fvcFlux.H"
#include "fvcSnGrad.H"
#include "fvcReconstruct.H"
#include "fvmDiv.H"
#include "fvmLaplacian.H"
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
void Foam::solvers::isothermalFilm::constrainFixedFlux
(
    surfaceScalarField& pbByAlphaf,
    surfaceScalarField& pbByAlphaGradRhof,
    surfaceScalarField& phip
)
{
    surfaceScalarField::Boundary& pbByAlphaBf = pbByAlphaf.boundaryFieldRef();
 
    surfaceScalarField::Boundary& pbByAlphaGradRhoBf =
        pbByAlphaGradRhof.boundaryFieldRef();
 
    surfaceScalarField::Boundary& phipBf = phip.boundaryFieldRef();
 
    const volVectorField::Boundary& UBf = U.boundaryField();
 
    forAll(mesh.boundary(), patchi)
    {
        if (!UBf[patchi].assignable())
        {
            pbByAlphaBf[patchi] = 0;
            pbByAlphaGradRhoBf[patchi] = 0;
            phipBf[patchi] = 0;
        }
    }
}
 
 
void Foam::solvers::isothermalFilm::correctAlpha()
{
    volScalarField& alpha = alpha_;
 
    fvVectorMatrix& UEqn = tUEqn.ref();
 
    const surfaceScalarField rhof(fvc::interpolate(rho));
 
    surfaceScalarField pbByAlphaf(this->pbByAlphaf());
    surfaceScalarField pbByAlphaGradRhof
    (
        constrainedField(this->pbByAlphaGradRhof()*mesh.magSf())
    );
 
    surfaceScalarField phip
    (
        constrainedField
        (
            fvc::snGrad(pe() + pc(surfaceTension->sigma()), "snGrad(p)")
           *mesh.magSf()
          - rhof*(g & mesh.Sf())
        )
    );
 
    constrainFixedFlux(pbByAlphaf, pbByAlphaGradRhof, phip);
 
    while (pimple.correct())
    {
        const volScalarField rAU(1/UEqn.A());
        const volVectorField HbyA(constrainHbyA(rAU*UEqn.H(), U, alpha));
 
        const surfaceScalarField alphaf
        (
            constrainedField(fvc::interpolate(alpha))
        );
 
        const surfaceScalarField alpharAUf
        (
            constrainedField(fvc::interpolate(alpha*rAU))
        );
 
        const surfaceScalarField phig("phig", phip + pbByAlphaGradRhof*alphaf);
 
        phi_ = constrainedField(fvc::flux(HbyA) - alpharAUf*phig);
 
        const surfaceScalarField phid("phid", rhof*phi);
 
        const surfaceScalarField rAUf
        (
            "rAUf",
            alphaf*rhof*alpharAUf*pbByAlphaf
        );
 
        fvScalarMatrix alphadEqn
        (
            fvm::ddt(rho, alpha)
          + fvm::div(phid, alpha)
         ==
            fvModels().source(rho, alpha)
        );
 
        while (pimple.correctNonOrthogonal())
        {
            fvScalarMatrix alphaEqn(alphadEqn - fvm::laplacian(rAUf, alpha));
 
            alphaEqn.solve();
 
            if (pimple.finalNonOrthogonalIter())
            {
                alphaRhoPhi_ = alphaEqn.flux();
            }
        }
 
        const surfaceScalarField phiGradAlpha
        (
            constrainedField(pbByAlphaf*fvc::snGrad(alpha)*mesh.magSf())
        );
 
        phi_ -= alpharAUf*phiGradAlpha;
 
        U_ = HbyA - rAU*fvc::reconstruct(alphaf*(phig + phiGradAlpha));
 
        // Remove film-normal component of velocity
        U_ -= nHat*(nHat & U);
 
        U_.correctBoundaryConditions();
 
        fvConstraints().constrain(U_);
 
        fvConstraints().constrain(alpha);
 
        continuityErrors();
    }
 
    // Update film thickness
    correctDelta();
 
    tUEqn.clear();
}
 
 
// ************************************************************************* //