filmTurbulenceModel.C

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#include "filmTurbulenceModel.H"
#include "gravityMeshObject.H"
#include "turbulentTransportModel.H"
#include "turbulentFluidThermoModel.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{
namespace regionModels
{
namespace areaSurfaceFilmModels
{

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

defineTypeNameAndDebug(filmTurbulenceModel, 0);
defineRunTimeSelectionTable(filmTurbulenceModel, dictionary);

const Enum
<
    filmTurbulenceModel::frictionMethodType
>
filmTurbulenceModel::frictionMethodTypeNames_
{
    { frictionMethodType::mquadraticProfile, "quadraticProfile" },
    { frictionMethodType::mlinearProfile, "linearProfile" },
    { frictionMethodType::mDarcyWeisbach, "DarcyWeisbach" },
    { frictionMethodType::mManningStrickler, "ManningStrickler" }
};


const Enum
<
    filmTurbulenceModel::shearMethodType
>
filmTurbulenceModel::shearMethodTypeNames_
{
    { shearMethodType::msimple, "simple" },
    { shearMethodType::mwallFunction, "wallFunction" }
};


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

filmTurbulenceModel::filmTurbulenceModel
(
    const word& modelType,
    liquidFilmBase& film,
    const dictionary& dict
)
:
    film_(film),
    dict_(dict.subDict(modelType + "Coeffs")),
    method_(frictionMethodTypeNames_.get("friction", dict_)),
    shearMethod_(shearMethodTypeNames_.get("shearStress", dict_)),
    rhoName_(dict_.getOrDefault<word>("rho", "rho")),
    rhoRef_(VGREAT)
{
    if (rhoName_ == "rhoInf")
    {
        rhoRef_ = dict_.get<scalar>("rhoInf");
    }
}


// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //

const liquidFilmBase& filmTurbulenceModel::film() const
{
    return film_;
}


tmp<areaScalarField> filmTurbulenceModel::Cw() const
{
    auto tCw = areaScalarField::New
    (
        "tCw",
        IOobject::NO_REGISTER,
        film_.regionMesh(),
        dimensionedScalar(dimVelocity, Zero)
    );
    auto& Cw = tCw.ref();


    switch (method_)
    {
        case mquadraticProfile:
        {
            const scalarField& mu = film_.mu().primitiveField();
            const scalarField& h = film_.h().primitiveField();
            const scalarField& rho = film_.rho().primitiveField();

            const scalar h0 = film_.h0().value();

            Cw.primitiveFieldRef() = 3*mu/((h + h0)*rho);
            Cw.clamp_max(5000.0);

            break;
        }
        case mlinearProfile:
        {
            const scalarField& mu = film_.mu().primitiveField();
            const scalarField& h = film_.h().primitiveField();
            const scalarField& rho = film_.rho().primitiveField();

            const scalar h0 = film_.h0().value();

            Cw.primitiveFieldRef() = 2*mu/((h + h0)*rho);

            break;
        }
        case mDarcyWeisbach:
        {
            const uniformDimensionedVectorField& g =
                meshObjects::gravity::New(film_.primaryMesh().time());
            const vectorField& Uf = film_.Uf().primitiveField();
            const scalarField& rho = film_.rho().primitiveField();

            const scalar Cf = dict_.get<scalar>("DarcyWeisbach");

            Cw.primitiveFieldRef() = Cf*mag(g.value())*mag(Uf)/rho;

            break;
        }
        case mManningStrickler:
        {
            const uniformDimensionedVectorField& g =
                meshObjects::gravity::New(film_.primaryMesh().time());

            const vectorField& Uf = film_.Uf().primitiveField();
            const scalarField& h = film_.h().primitiveField();
            const scalar h0 = film_.h0().value();

            const scalar n = dict_.get<scalar>("n");

            Cw.primitiveFieldRef() =
                sqr(n)*mag(g.value())*mag(Uf)/cbrt(h + h0);

            break;
        }
        default:
        {
            FatalErrorInFunction
                << "Unimplemented method "
                << frictionMethodTypeNames_[method_] << nl
                << "Please set 'frictionMethod' to one of "
                << flatOutput(frictionMethodTypeNames_.sortedToc()) << nl
                << exit(FatalError);

            break;
        }
    }

    return tCw;
}


tmp<faVectorMatrix> filmTurbulenceModel::primaryRegionFriction
(
    areaVectorField& U
) const
{
    auto tshearStress =
        tmp<faVectorMatrix>::New(U, sqr(U.dimensions())*sqr(dimLength));

    switch (shearMethod_)
    {
        case msimple:
        {
            tmp<areaVectorField> Up = film_.Up();

            const dimensionedScalar Cf
            (
                "Cf",
                dimVelocity,
                dict_.get<scalar>("Cf")
            );

            tshearStress.ref() += - fam::Sp(Cf, U) + Cf*Up();

            break;
        }
        case mwallFunction:
        {
            tmp<volSymmTensorField> tdevRhoReff = devRhoReff();

            const surfaceVectorField::Boundary& Sfb
                = film_.primaryMesh().Sf().boundaryField();

            const volSymmTensorField::Boundary& devRhoReffb
                = tdevRhoReff().boundaryField();

            // The polyPatch/local-face for each of the faceLabels
            const List<labelPair>& patchFaces
                = film_.regionMesh().whichPatchFaces();

            // All referenced polyPatches (== primaryPatchIDs())
            const labelList& patchIds
                = film_.regionMesh().whichPolyPatches();

            // Values per patch
            PtrMap<vectorField> patchFields(2*patchIds.size());

            for (const label patchi : patchIds)
            {
                patchFields.set
                (
                    patchi,
                    Sfb[patchi] & devRhoReffb[patchi]
                );
            }

            vectorField afT(patchFaces.size(), Zero);

            const vectorField& nHat =
                film_.regionMesh().faceAreaNormals().internalField();

            forAll(patchFaces, i)
            {
                const label patchi = patchFaces[i].first();
                const label facei = patchFaces[i].second();

                const auto* pfld = patchFields.get(patchi);

                if (pfld)
                {
                    afT[i] = (*pfld)[facei];
                    // Subtract normal component
                    afT[i].removeCollinear(nHat[i]);
                }
            }

            auto taForce = areaVectorField::New
            (
                "taForce",
                IOobject::NO_REGISTER,
                film_.regionMesh(),
                dimensionedVector(sqr(dimVelocity), Zero)
            );
            vectorField& aForce = taForce.ref().primitiveFieldRef();

            const DimensionedField<scalar, areaMesh>& magSf =
                film_.regionMesh().S();

            aForce = afT/(film_.rho().primitiveField()*magSf);

            tshearStress.ref() += taForce();

            if (film_.regionMesh().time().writeTime())
            {
                taForce().write();
            }

            break;
        }
    }

    return tshearStress;
}


tmp<Foam::volSymmTensorField> filmTurbulenceModel::devRhoReff() const
{
    typedef compressible::turbulenceModel cmpTurbModel;
    typedef incompressible::turbulenceModel icoTurbModel;

    const fvMesh& m = film_.primaryMesh();

    const auto& U = m.lookupObject<volVectorField>(film_.UName());

    if (m.foundObject<cmpTurbModel>(cmpTurbModel::propertiesName))
    {
        const auto& turb =
            m.lookupObject<cmpTurbModel>(cmpTurbModel::propertiesName);

        return turb.devRhoReff();
    }
    else if (m.foundObject<icoTurbModel>(icoTurbModel::propertiesName))
    {
        const auto& turb =
            m.lookupObject<icoTurbModel>(icoTurbModel::propertiesName);

        return rho()*turb.devReff();
    }
    else if (m.foundObject<fluidThermo>(fluidThermo::dictName))
    {
        const auto& thermo =
            m.lookupObject<fluidThermo>(fluidThermo::dictName);

        return -thermo.mu()*devTwoSymm(fvc::grad(U));
    }
    else if (m.foundObject<transportModel>("transportProperties"))
    {
        const auto& laminarT =
            m.lookupObject<transportModel>("transportProperties");

        return -rho()*laminarT.nu()*devTwoSymm(fvc::grad(U));
    }
    else if (m.foundObject<dictionary>("transportProperties"))
    {
        const auto& transportProperties =
            m.lookupObject<dictionary>("transportProperties");

        const dimensionedScalar nu("nu", dimViscosity, transportProperties);

        return -rho()*nu*devTwoSymm(fvc::grad(U));
    }
    else
    {
        FatalErrorInFunction
            << "No valid model for viscous stress calculation"
            << exit(FatalError);

        return nullptr;
    }
}


tmp<Foam::volScalarField> filmTurbulenceModel::rho() const
{
    const fvMesh& mesh = film_.primaryMesh();

    if (rhoName_ == "rhoInf")
    {
        return volScalarField::New
        (
            "rho",
            IOobject::NO_REGISTER,
            mesh,
            dimensionedScalar(dimDensity, rhoRef_)
        );
    }

    return mesh.lookupObject<volScalarField>(rhoName_);
}


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace areaSurfaceFilmModels
} // End namespace regionModels
} // End namespace Foam

// ************************************************************************* //