contactAngleForce.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2020 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
\*---------------------------------------------------------------------------*/
 
#include "contactAngleForce.H"
#include "addToRunTimeSelectionTable.H"
#include "faCFD.H"
#include "unitConversion.H"
#include "meshWavePatchDistMethod.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace regionModels
{
namespace areaSurfaceFilmModels
{
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
defineTypeNameAndDebug(contactAngleForce, 0);
 
// * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * * //
 
void contactAngleForce::initialise()
{
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
contactAngleForce::contactAngleForce
(
    const word& typeName,
    liquidFilmBase& film,
    const dictionary& dict
)
:
    force(typeName, film, dict),
    Ccf_(coeffDict_.get<scalar>("Ccf")),
    mask_
    (
        IOobject
        (
            typeName + ":fContactForceMask",
            film.primaryMesh().time().timeName(),
            film.primaryMesh(),
            IOobject::NO_READ,
            IOobject::NO_WRITE
        ),
        film.regionMesh(),
        dimensionedScalar("mask", dimless, 1.0)
    )
{
    initialise();
}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
contactAngleForce::~contactAngleForce()
{}
 
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
tmp<faVectorMatrix> contactAngleForce::correct(areaVectorField& U)
{
    tmp<areaVectorField> tForce
    (
        new areaVectorField
        (
            IOobject
            (
                typeName + ":contactForce",
                film().primaryMesh().time().timeName(),
                film().primaryMesh(),
                IOobject::NO_READ,
                IOobject::NO_WRITE
            ),
            film().regionMesh(),
            dimensionedVector(dimForce/dimDensity/dimArea, Zero)
        )
    );
 
    vectorField& force = tForce.ref().primitiveFieldRef();
 
    const labelUList& own = film().regionMesh().owner();
    const labelUList& nbr = film().regionMesh().neighbour();
 
    const DimensionedField<scalar, areaMesh>& magSf = film().regionMesh().S();
 
    tmp<areaScalarField> talpha = film().alpha();
    const areaScalarField& sigma = film().sigma();
 
    const areaScalarField& rhof = film().rho();
 
    tmp<areaScalarField> ttheta = theta();
    const areaScalarField& theta = ttheta();
 
    const areaVectorField gradAlpha(fac::grad(talpha()));
 
    forAll(nbr, edgei)
    {
        const label faceO = own[edgei];
        const label faceN = nbr[edgei];
 
        label facei = -1;
        if ((talpha()[faceO] > 0.5) && (talpha()[faceN] < 0.5))
        {
            facei = faceO;
        }
        else if ((talpha()[faceO] < 0.5) && (talpha()[faceN] > 0.5))
        {
            facei = faceN;
        }
 
        if (facei != -1 && mask_[facei] > 0.5)
        {
            const scalar invDx = film().regionMesh().deltaCoeffs()[edgei];
            const vector n
            (
                gradAlpha[facei]/(mag(gradAlpha[facei]) + ROOTVSMALL)
            );
            const scalar cosTheta = cos(degToRad(theta[facei]));
 
            force[facei] +=
                Ccf_*n*sigma[facei]*(1 - cosTheta)/invDx/rhof[facei];
        }
    }
 
    forAll(sigma.boundaryField(), patchi)
    {
        const faPatchField<scalar>& alphaPf = sigma.boundaryField()[patchi];
        const faPatchField<scalar>& sigmaPf = sigma.boundaryField()[patchi];
        const labelUList& faces = alphaPf.patch().edgeFaces();
 
        forAll(sigmaPf, edgei)
        {
            label face0 = faces[edgei];
            force[face0] = vector::zero;
        }
    }
 
 
    force /= magSf.field();
 
    if (film().regionMesh().time().writeTime())
    {
        tForce().write();
        gradAlpha.write();
    }
 
    tmp<faVectorMatrix> tfvm
    (
        new faVectorMatrix(U, dimForce/dimDensity)
    );
 
    tfvm.ref() += tForce;
 
    return tfvm;
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace areaSurfaceFilmModels
} // End namespace regionModels
} // End namespace Foam
 
// ************************************************************************* //