DarcyForchheimer.C

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    Copyright (C) 2018-2023 OpenCFD Ltd.
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License
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#include "addToRunTimeSelectionTable.H"
#include "DarcyForchheimer.H"
#include "geometricOneField.H"
#include "fvMatrices.H"
#include "pointIndList.H"

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

namespace Foam
{
    namespace porosityModels
    {
        defineTypeNameAndDebug(DarcyForchheimer, 0);
        addToRunTimeSelectionTable(porosityModel, DarcyForchheimer, mesh);
    }
}


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

Foam::porosityModels::DarcyForchheimer::DarcyForchheimer
(
    const word& name,
    const word& modelType,
    const fvMesh& mesh,
    const dictionary& dict,
    const wordRe& cellZoneName
)
:
    porosityModel(name, modelType, mesh, dict, cellZoneName),
    dXYZ_("d", dimless/sqr(dimLength), coeffs_),
    fXYZ_("f", dimless/dimLength, coeffs_),
    D_(cellZoneIDs_.size()),
    F_(cellZoneIDs_.size()),
    rhoName_(coeffs_.getOrDefault<word>("rho", "rho")),
    muName_(coeffs_.getOrDefault<word>("mu", "thermo:mu")),
    nuName_(coeffs_.getOrDefault<word>("nu", "nu"))
{
    adjustNegativeResistance(dXYZ_);
    adjustNegativeResistance(fXYZ_);

    calcTransformModelData();
}


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

void Foam::porosityModels::DarcyForchheimer::calcTransformModelData()
{
    // The Darcy coefficient as a tensor
    tensor darcyCoeff(Zero);
    darcyCoeff.xx() = dXYZ_.value().x();
    darcyCoeff.yy() = dXYZ_.value().y();
    darcyCoeff.zz() = dXYZ_.value().z();

    // The Forchheimer coefficient as a tensor
    // - the leading 0.5 is from 1/2*rho
    tensor forchCoeff(Zero);
    forchCoeff.xx() = 0.5*fXYZ_.value().x();
    forchCoeff.yy() = 0.5*fXYZ_.value().y();
    forchCoeff.zz() = 0.5*fXYZ_.value().z();

    if (csys().uniform())
    {
        forAll(cellZoneIDs_, zonei)
        {
            D_[zonei].resize(1);
            F_[zonei].resize(1);

            D_[zonei] = csys().transform(darcyCoeff);
            F_[zonei] = csys().transform(forchCoeff);
        }
    }
    else
    {
        forAll(cellZoneIDs_, zonei)
        {
            const pointUIndList cc
            (
                mesh_.cellCentres(),
                mesh_.cellZones()[cellZoneIDs_[zonei]]
            );

            D_[zonei] = csys().transform(cc, darcyCoeff);
            F_[zonei] = csys().transform(cc, forchCoeff);
        }
    }


    if
    (
        debug
     && (
            mesh_.time().writeTime()
         || mesh_.time().timeIndex() == mesh_.time().startTimeIndex()
        )
    )
    {
        volTensorField Dout
        (
            mesh_.newIOobject(IOobject::scopedName(typeName, "D")),
            mesh_,
            dimensionedTensor(dXYZ_.dimensions(), Zero)
        );

        volTensorField Fout
        (
            mesh_.newIOobject(IOobject::scopedName(typeName, "F")),
            mesh_,
            dimensionedTensor(fXYZ_.dimensions(), Zero)
        );

        forAll(cellZoneIDs_, zonei)
        {
            const labelList& cells = mesh_.cellZones()[cellZoneIDs_[zonei]];

            if (csys().uniform())
            {
                UIndirectList<tensor>(Dout, cells) = D_[zonei].first();
                UIndirectList<tensor>(Fout, cells) = F_[zonei].first();
            }
            else
            {
                UIndirectList<tensor>(Dout, cells) = D_[zonei];
                UIndirectList<tensor>(Fout, cells) = F_[zonei];
            }
        }

        Dout.write();
        Fout.write();
    }
}


void Foam::porosityModels::DarcyForchheimer::calcForce
(
    const volVectorField& U,
    const volScalarField& rho,
    const volScalarField& mu,
    vectorField& force
) const
{
    scalarField Udiag(U.size(), Zero);
    vectorField Usource(U.size(), Zero);
    const scalarField& V = mesh_.V();

    apply(Udiag, Usource, V, rho, mu, U);

    force = Udiag*U - Usource;
}


void Foam::porosityModels::DarcyForchheimer::correct
(
    fvVectorMatrix& UEqn
) const
{
    const volVectorField& U = UEqn.psi();
    const scalarField& V = mesh_.V();
    scalarField& Udiag = UEqn.diag();
    vectorField& Usource = UEqn.source();

    word rhoName(IOobject::groupName(rhoName_, U.group()));
    word muName(IOobject::groupName(muName_, U.group()));
    word nuName(IOobject::groupName(nuName_, U.group()));

    if (UEqn.dimensions() == dimForce)
    {
        const auto& rho = mesh_.lookupObject<volScalarField>(rhoName);

        if (mesh_.foundObject<volScalarField>(muName))
        {
            const auto& mu = mesh_.lookupObject<volScalarField>(muName);

            apply(Udiag, Usource, V, rho, mu, U);
        }
        else
        {
            const auto& nu = mesh_.lookupObject<volScalarField>(nuName);

            apply(Udiag, Usource, V, rho, rho*nu, U);
        }
    }
    else
    {
        if (mesh_.foundObject<volScalarField>(nuName))
        {
            const auto& nu = mesh_.lookupObject<volScalarField>(nuName);

            apply(Udiag, Usource, V, geometricOneField(), nu, U);
        }
        else
        {
            const auto& rho = mesh_.lookupObject<volScalarField>(rhoName);
            const auto& mu = mesh_.lookupObject<volScalarField>(muName);

            apply(Udiag, Usource, V, geometricOneField(), mu/rho, U);
        }
    }
}


void Foam::porosityModels::DarcyForchheimer::correct
(
    fvVectorMatrix& UEqn,
    const volScalarField& rho,
    const volScalarField& mu
) const
{
    const vectorField& U = UEqn.psi();
    const scalarField& V = mesh_.V();
    scalarField& Udiag = UEqn.diag();
    vectorField& Usource = UEqn.source();

    apply(Udiag, Usource, V, rho, mu, U);
}


void Foam::porosityModels::DarcyForchheimer::correct
(
    const fvVectorMatrix& UEqn,
    volTensorField& AU
) const
{
    const volVectorField& U = UEqn.psi();

    word rhoName(IOobject::groupName(rhoName_, U.group()));
    word muName(IOobject::groupName(muName_, U.group()));
    word nuName(IOobject::groupName(nuName_, U.group()));

    if (UEqn.dimensions() == dimForce)
    {
        const auto& rho = mesh_.lookupObject<volScalarField>(rhoName);
        const auto& mu = mesh_.lookupObject<volScalarField>(muName);

        apply(AU, rho, mu, U);
    }
    else
    {
        if (mesh_.foundObject<volScalarField>(nuName))
        {
            const auto& nu = mesh_.lookupObject<volScalarField>(nuName);

            apply(AU, geometricOneField(), nu, U);
        }
        else
        {
            const auto& rho = mesh_.lookupObject<volScalarField>(rhoName);
            const auto& mu = mesh_.lookupObject<volScalarField>(muName);

            apply(AU, geometricOneField(), mu/rho, U);
        }
    }
}


bool Foam::porosityModels::DarcyForchheimer::writeData(Ostream& os) const
{
    dict_.writeEntry(name_, os);

    return true;
}


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