ReynoldsAnalogy.C

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    Copyright (C) 2017-2020 OpenCFD Ltd.
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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.
 
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    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/>.
 
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#include "ReynoldsAnalogy.H"
#include "fluidThermo.H"
#include "turbulentTransportModel.H"
#include "turbulentFluidThermoModel.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace heatTransferCoeffModels
{
    defineTypeNameAndDebug(ReynoldsAnalogy, 0);
    addToRunTimeSelectionTable
    (
        heatTransferCoeffModel,
        ReynoldsAnalogy,
        dictionary
    );
}
}
 
 
// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
Foam::tmp<Foam::Field<Foam::scalar>>
Foam::heatTransferCoeffModels::ReynoldsAnalogy::rho(const label patchi) const
{
    if (rhoName_ == "rhoInf")
    {
        const label n = mesh_.boundary()[patchi].size();
        return tmp<Field<scalar>>::New(n, rhoRef_);
    }
    else if (mesh_.foundObject<volScalarField>(rhoName_, false))
    {
        const auto& rho = mesh_.lookupObject<volScalarField>(rhoName_);
        return rho.boundaryField()[patchi];
    }
 
    FatalErrorInFunction
        << "Unable to set rho for patch " << patchi
        << exit(FatalError);
 
    return nullptr;
}
 
 
Foam::tmp<Foam::Field<Foam::scalar>>
Foam::heatTransferCoeffModels::ReynoldsAnalogy::Cp(const label patchi) const
{
    if (CpName_ == "CpInf")
    {
        const label n = mesh_.boundary()[patchi].size();
        return tmp<Field<scalar>>::New(n, CpRef_);
    }
    else if (mesh_.foundObject<fluidThermo>(fluidThermo::dictName))
    {
        const auto& thermo =
            mesh_.lookupObject<fluidThermo>(fluidThermo::dictName);
 
        const scalarField& pp = thermo.p().boundaryField()[patchi];
        const scalarField& Tp = thermo.T().boundaryField()[patchi];
 
        return thermo.Cp(pp, Tp, patchi);
    }
 
    FatalErrorInFunction
        << "Unable to set Cp for patch " << patchi
        << exit(FatalError);
 
    return nullptr;
}
 
 
Foam::tmp<Foam::volSymmTensorField>
Foam::heatTransferCoeffModels::ReynoldsAnalogy::devReff() const
{
    typedef compressible::turbulenceModel cmpTurbModel;
    typedef incompressible::turbulenceModel icoTurbModel;
 
    if (mesh_.foundObject<cmpTurbModel>(cmpTurbModel::propertiesName))
    {
        const auto& turb =
            mesh_.lookupObject<cmpTurbModel>(cmpTurbModel::propertiesName);
 
        return turb.devRhoReff()/turb.rho();
    }
    else if (mesh_.foundObject<icoTurbModel>(icoTurbModel::propertiesName))
    {
        const incompressible::turbulenceModel& turb =
            mesh_.lookupObject<icoTurbModel>(icoTurbModel::propertiesName);
 
        return turb.devReff();
    }
    else if (mesh_.foundObject<fluidThermo>(fluidThermo::dictName))
    {
        const auto& thermo =
            mesh_.lookupObject<fluidThermo>(fluidThermo::dictName);
 
        const auto& U = mesh_.lookupObject<volVectorField>(UName_);
 
        return -thermo.nu()*dev(twoSymm(fvc::grad(U)));
    }
    else if (mesh_.foundObject<transportModel>("transportProperties"))
    {
        const auto& laminarT =
            mesh_.lookupObject<transportModel>("transportProperties");
 
        const auto& U = mesh_.lookupObject<volVectorField>(UName_);
 
        return -laminarT.nu()*dev(twoSymm(fvc::grad(U)));
    }
    else if (mesh_.foundObject<dictionary>("transportProperties"))
    {
        const auto& transportProperties =
            mesh_.lookupObject<dictionary>("transportProperties");
 
        const dimensionedScalar nu("nu", dimViscosity, transportProperties);
 
        const auto& U = mesh_.lookupObject<volVectorField>(UName_);
 
        return -nu*dev(twoSymm(fvc::grad(U)));
    }
 
    FatalErrorInFunction
        << "No valid model for viscous stress calculation"
        << exit(FatalError);
 
    return nullptr;
}
 
 
Foam::tmp<Foam::FieldField<Foam::Field, Foam::scalar>>
Foam::heatTransferCoeffModels::ReynoldsAnalogy::Cf() const
{
    const auto& U = mesh_.lookupObject<volVectorField>(UName_);
    const volVectorField::Boundary& Ubf = U.boundaryField();
 
    auto tCf = tmp<FieldField<Field, scalar>>::New(Ubf.size());
    auto& Cf = tCf.ref();
 
    forAll(Cf, patchi)
    {
        Cf.set(patchi, new Field<scalar>(Ubf[patchi].size(), Zero));
    }
 
    const volSymmTensorField R(devReff());
    const volSymmTensorField::Boundary& Rbf = R.boundaryField();
 
    for (const label patchi : patchSet_)
    {
        const fvPatchVectorField& Up = Ubf[patchi];
 
        const symmTensorField& Rp = Rbf[patchi];
 
        const vectorField nHat(Up.patch().nf());
 
        const scalarField tauByRhop(mag(nHat & Rp));
 
        Cf[patchi] = 2*tauByRhop/magSqr(URef_);
    }
 
    return tCf;
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::heatTransferCoeffModels::ReynoldsAnalogy::ReynoldsAnalogy
(
    const dictionary& dict,
    const fvMesh& mesh,
    const word& TName
)
:
    heatTransferCoeffModel(dict, mesh, TName),
    UName_("U"),
    URef_(Zero),
    rhoName_("rho"),
    rhoRef_(0),
    CpName_("Cp"),
    CpRef_(0)
{
    read(dict);
}
 
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
bool Foam::heatTransferCoeffModels::ReynoldsAnalogy::read
(
    const dictionary& dict
)
{
    if (heatTransferCoeffModel::read(dict))
    {
        dict.readEntry("UInf", URef_);
 
        dict.readIfPresent("Cp", CpName_);
        if (CpName_ == "CpInf")
        {
            dict.readEntry("CpInf", CpRef_);
        }
 
        dict.readIfPresent("rho", rhoName_);
        if (rhoName_ == "rhoInf")
        {
            dict.readEntry("rhoInf", rhoRef_);
        }
 
        return true;
    }
 
    return false;
}
 
 
void Foam::heatTransferCoeffModels::ReynoldsAnalogy::htc
(
    volScalarField& htc,
    const FieldField<Field, scalar>& q
)
{
    const FieldField<Field, scalar> CfBf(Cf());
    const scalar magU = mag(URef_);
 
    volScalarField::Boundary& htcBf = htc.boundaryFieldRef();
 
    for (const label patchi : patchSet_)
    {
        const scalarField rhop(rho(patchi));
        const scalarField Cpp(Cp(patchi));
 
        htcBf[patchi] = 0.5*rhop*Cpp*magU*CfBf[patchi];
    }
}
 
 
// ************************************************************************* //