interfaceHeatResistance.C

Go to the documentation of this file.

/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2020-2021 OpenCFD Ltd.
    Copyright (C) 2020 Henning Scheufler
-------------------------------------------------------------------------------
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 "interfaceHeatResistance.H"
#include "addToRunTimeSelectionTable.H"
#include "twoPhaseMixtureEThermo.H"
#include "cutCellIso.H"
#include "volPointInterpolation.H"
#include "calculatedFvPatchFields.H"
#include "wallPolyPatch.H"
#include "fvcSmooth.H"
#include "fvmSup.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace temperaturePhaseChangeTwoPhaseMixtures
{
    defineTypeNameAndDebug(interfaceHeatResistance, 0);
    addToRunTimeSelectionTable
    (
        temperaturePhaseChangeTwoPhaseMixture,
        interfaceHeatResistance,
        components
    );
}
}
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::temperaturePhaseChangeTwoPhaseMixtures::interfaceHeatResistance::
interfaceHeatResistance
(
    const thermoIncompressibleTwoPhaseMixture& mixture,
    const fvMesh& mesh
)
:
    temperaturePhaseChangeTwoPhaseMixture(mixture, mesh),
    R_
    (
        "R",
        dimPower/dimArea/dimTemperature, optionalSubDict(type() + "Coeffs")
    ),
 
    interfaceArea_
    (
        IOobject
        (
            "interfaceArea",
            mesh_.time().timeName(),
            mesh_,
            IOobject::NO_READ,
            IOobject::AUTO_WRITE
        ),
        mesh_,
        dimensionedScalar(dimless/dimLength, Zero)
    ),
 
    mDotc_
    (
        IOobject
        (
            "mDotc",
            mesh_.time().timeName(),
            mesh_,
            IOobject::NO_READ,
            IOobject::AUTO_WRITE
        ),
        mesh_,
        dimensionedScalar(dimDensity/dimTime, Zero)
    ),
 
    mDote_
    (
        IOobject
        (
            "mDote",
            mesh_.time().timeName(),
            mesh_,
            IOobject::NO_READ,
            IOobject::AUTO_WRITE
        ),
        mesh_,
        dimensionedScalar(dimDensity/dimTime, Zero)
    ),
 
    mDotcSpread_
    (
        IOobject
        (
            "mDotcSpread",
            mesh_.time().timeName(),
            mesh_,
            IOobject::NO_READ,
            IOobject::NO_WRITE
        ),
        mesh_,
        dimensionedScalar(dimDensity/dimTime, Zero)
    ),
 
    mDoteSpread_
    (
        IOobject
        (
            "mDoteSpread",
            mesh_.time().timeName(),
            mesh_,
            IOobject::NO_READ,
            IOobject::NO_WRITE
        ),
        mesh_,
        dimensionedScalar(dimDensity/dimTime, Zero)
    ),
 
    spread_
    (
        optionalSubDict(type() + "Coeffs").get<scalar>("spread")
    )
{
    correct();
}
 
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
Foam::Pair<Foam::tmp<Foam::volScalarField>>
Foam::temperaturePhaseChangeTwoPhaseMixtures::interfaceHeatResistance::
vDotAlphal() const
{
    dimensionedScalar alphalCoeff(1.0/mixture_.rho1());
 
    return Pair<tmp<volScalarField>>
    (
        (alphalCoeff*mDotc_)/(mixture_.alpha2() + SMALL),
       -(alphalCoeff*mDote_)/(mixture_.alpha1() + SMALL)
    );
}
 
 
Foam::Pair<Foam::tmp<Foam::volScalarField>>
Foam::temperaturePhaseChangeTwoPhaseMixtures::interfaceHeatResistance::
mDotAlphal() const
{
    volScalarField limitedAlpha1
    (
        min(max(mixture_.alpha1(), scalar(0)), scalar(1))
    );
 
    volScalarField limitedAlpha2
    (
        min(max(mixture_.alpha2(), scalar(0)), scalar(1))
    );
 
    return Pair<tmp<volScalarField>>
    (
        (mDotc_/(limitedAlpha2 + SMALL)),
       -(mDote_/(limitedAlpha1 + SMALL))
    );
}
 
 
Foam::Pair<Foam::tmp<Foam::volScalarField>>
Foam::temperaturePhaseChangeTwoPhaseMixtures::interfaceHeatResistance::
mDot() const
{
    return Pair<tmp<volScalarField>>
    (
        tmp<volScalarField>(mDotc_),
        tmp<volScalarField>(mDote_)
    );
}
 
 
Foam::Pair<Foam::tmp<Foam::volScalarField>>
Foam::temperaturePhaseChangeTwoPhaseMixtures::interfaceHeatResistance::
mDotDeltaT() const
{
   const twoPhaseMixtureEThermo& thermo =
        refCast<const twoPhaseMixtureEThermo>
        (
            mesh_.lookupObject<basicThermo>(basicThermo::dictName)
        );
 
    const volScalarField& T = mesh_.lookupObject<volScalarField>("T");
 
    const dimensionedScalar& TSat = thermo.TSat();
 
    Pair<tmp<volScalarField>> mDotce(mDot());
 
    return Pair<tmp<volScalarField>>
    (
        mDotc_*pos(TSat - T.oldTime())/(TSat - T.oldTime()),
       -mDote_*pos(T.oldTime() - TSat)/(T.oldTime() - TSat)
    );
}
 
 
Foam::tmp<Foam::fvScalarMatrix>
Foam::temperaturePhaseChangeTwoPhaseMixtures::interfaceHeatResistance::
TSource() const
{
    const volScalarField& T = mesh_.lookupObject<volScalarField>("T");
 
    auto tTSource = tmp<fvScalarMatrix>::New(T, dimEnergy/dimTime);
    auto& TSource = tTSource.ref();
 
    const twoPhaseMixtureEThermo& thermo =
        refCast<const twoPhaseMixtureEThermo>
        (
            mesh_.lookupObject<basicThermo>(basicThermo::dictName)
        );
 
    const dimensionedScalar& TSat = thermo.TSat();
 
    // interface heat resistance
    volScalarField IHRcoeff(interfaceArea_*R_);
 
    TSource = fvm::Sp(IHRcoeff, T) - IHRcoeff*TSat;
 
    return tTSource;
}
 
 
void Foam::temperaturePhaseChangeTwoPhaseMixtures::interfaceHeatResistance::
correct()
{
    // Update Interface
    updateInterface();
 
    // Update mDotc_ and mDote_
    const volScalarField& T = mesh_.lookupObject<volScalarField>("T");
 
    const twoPhaseMixtureEThermo& thermo =
        refCast<const twoPhaseMixtureEThermo>
        (
            mesh_.lookupObject<basicThermo>(basicThermo::dictName)
        );
 
    const dimensionedScalar& TSat = thermo.TSat();
    const dimensionedScalar T0(dimTemperature, Zero);
 
    dimensionedScalar L = mixture_.Hf2() - mixture_.Hf1();
 
    // interface heat resistance
    mDotc_ = interfaceArea_*R_*max(TSat - T, T0)/L;
    mDote_ = interfaceArea_*R_*max(T - TSat, T0)/L;
 
    // Limiting max condensation
    forAll(mDotc_, celli)
    {
        scalar rhobyDt = mixture_.rho1().value()/mesh_.time().deltaTValue();
        scalar maxEvap = mixture_.alpha1()[celli]*rhobyDt; // positive
        scalar maxCond = -mixture_.alpha2()[celli]*rhobyDt; // negative
        mDotc_[celli] = min(max(mDotc_[celli], maxCond), maxEvap);
    }
 
    // Calculate the spread sources
 
    dimensionedScalar D
    (
        "D",
        dimArea,
        spread_/sqr(gAverage(mesh_.nonOrthDeltaCoeffs()))
    );
 
 
    const volScalarField& alpha1 = mixture_.alpha1();
    const volScalarField& alpha2 = mixture_.alpha2();
 
    const dimensionedScalar MDotMin("MdotMin", mDotc_.dimensions(), 1e-3);
 
    if (max(mDotc_) > MDotMin)
    {
        fvc::spreadSource
        (
            mDotcSpread_,
            mDotc_,
            alpha1,
            alpha2,
            D,
            1e-3
        );
    }
 
    if (max(mDote_) > MDotMin)
    {
        fvc::spreadSource
        (
            mDoteSpread_,
            mDote_,
            alpha1,
            alpha2,
            D,
            1e-3
        );
    }
}
 
 
void Foam::temperaturePhaseChangeTwoPhaseMixtures::interfaceHeatResistance::
updateInterface()
{
 
    // interface heat resistance
    // Interpolating alpha1 cell centre values to mesh points (vertices)
    scalarField ap
    (
        volPointInterpolation::New(mesh_).interpolate(mixture_.alpha1())
    );
 
    cutCellIso cutCell(mesh_, ap);
 
    forAll(interfaceArea_, celli)
    {
        label status = cutCell.calcSubCell(celli, 0.5);
        interfaceArea_[celli] = 0;
        if (status == 0) // cell is cut
        {
            interfaceArea_[celli] =
                mag(cutCell.faceArea())/mesh_.V()[celli];
        }
    }
}
 
 
Foam::Pair<Foam::tmp<Foam::volScalarField>>
Foam::temperaturePhaseChangeTwoPhaseMixtures::interfaceHeatResistance::
vDot() const
{
 
    dimensionedScalar pCoeff(1.0/mixture_.rho1() - 1.0/mixture_.rho2());
 
    return Pair<tmp<volScalarField>>
    (
        pCoeff*mDotcSpread_,
       -pCoeff*mDoteSpread_
    );
}
 
 
bool Foam::temperaturePhaseChangeTwoPhaseMixtures::interfaceHeatResistance::
read()
{
    if (temperaturePhaseChangeTwoPhaseMixture::read())
    {
        optionalSubDict(type() + "Coeffs").readEntry("R", R_);
        optionalSubDict(type() + "Coeffs").readEntry("spread", spread_);
 
        return true;
    }
 
    return false;
}
 
 
// ************************************************************************* //