kinematicThinFilmIBM.C

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
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    Copyright (C) 2020 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
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    for more details.
 
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#include "kinematicThinFilmIBM.H"
#include "addToRunTimeSelectionTable.H"
#include "volFields.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace regionModels
{
namespace areaSurfaceFilmModels
{
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
defineTypeNameAndDebug(kinematicThinFilmIBM, 0);
addToRunTimeSelectionTable(liquidFilmBase, kinematicThinFilmIBM, dictionary);
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
kinematicThinFilmIBM::kinematicThinFilmIBM
(
    const word& modelType,
    const fvMesh& mesh,
    const dictionary& dict
)
:
    kinematicThinFilm(modelType, mesh, dict),
    immersedBoundary_(primaryMesh().time(), regionMesh())
{}
 
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
void kinematicThinFilmIBM::preEvolveRegion()
{
    kinematicThinFilm::preEvolveRegion();
 
    // Update the IBM models
    immersedBoundary_.correct(Uf_);
}
 
 
void kinematicThinFilmIBM::evolveRegion()
{
    DebugInFunction << endl;
 
    auto& Ustar = immersedBoundary_.Ustar();
 
    phi2s_ = fac::interpolate(h_)*phif_;
 
    for (int oCorr=1; oCorr<=nOuterCorr_; oCorr++)
    {
        areaVectorField rhs(-fac::grad(pf_*h_)/rho_ + pf_*fac::grad(h_)/rho_);
 
        // IBM force
        areaVectorField f((UEqn(Ustar) - rhs) & Ustar);
 
        // Ensure force is only applied to IBM faces
        immersedBoundary_.zeroFilter(f);
 
        pf_.storePrevIter();
 
        faVectorMatrix UsEqn(UEqn(Uf_) == f);
 
        UsEqn.relax();
 
        faOptions().constrain(UsEqn);
 
        if (momentumPredictor_)
        {
            solve(UsEqn == rhs);
        }
 
        for (int corr=1; corr<=nCorr_; corr++)
        {
            areaScalarField UsA(UsEqn.A());
 
            Uf_ = UsEqn.H()/UsA;
            Uf_.correctBoundaryConditions();
            faOptions().correct(Uf_);
 
            phif_ =
                (fac::interpolate(Uf_) & regionMesh().Le())
                - fac::interpolate(1.0/(rho_*UsA))
                * fac::lnGrad(pf_*h_)*regionMesh().magLe()
                + fac::interpolate(pf_/(rho_*UsA))
                * fac::lnGrad(h_)*regionMesh().magLe();
 
            for (int nFilm=1; nFilm<=nFilmCorr_; nFilm++)
            {
                faScalarMatrix hEqn
                (
                    fam::ddt(h_)
                  + fam::div(phif_, h_)
                 ==
                    faOptions()(rho_, h_, dimVelocity)
                  + rhoSp_
                );
 
                hEqn.relax();
                faOptions().constrain(hEqn);
                hEqn.solve();
                faOptions().correct(h_);
 
                if (nFilm == nFilmCorr_)
                {
                    phi2s_ = hEqn.flux();
                }
            }
 
            // Bound h_
            h_ = max(h_, h0_);
 
            pf_ = rho_*gn_*h_ - sigma_*fac::laplacian(h_) + pnSp_ + ppf_;
            pf_.correctBoundaryConditions();
            pf_.relax();
 
            Uf_ -= (1.0/(rho_*UsA))*fac::grad(pf_*h_)
                - (pf_/(rho_*UsA))*fac::grad(h_);
            Uf_.correctBoundaryConditions();
            faOptions().correct(Uf_);
        }
    }
 
    Info<< "Film h min/max   = " << gMinMax(h_) << nl
        << "Film mag(U) min/max   = " << gMinMaxMag(Uf_) << endl;
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace areaSurfaceFilmModels
} // End namespace regionModels
} // End namespace Foam
 
// ************************************************************************* //