viewFactor.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
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
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\*---------------------------------------------------------------------------*/
 
#include "viewFactor.H"
#include "surfaceFields.H"
#include "constants.H"
#include "greyDiffusiveViewFactorFixedValueFvPatchScalarField.H"
#include "typeInfo.H"
#include "addToRunTimeSelectionTable.H"
#include "boundaryRadiationProperties.H"
 
using namespace Foam::constant;
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
    namespace radiation
    {
        defineTypeNameAndDebug(viewFactor, 0);
        addToRadiationRunTimeSelectionTables(viewFactor);
    }
}
 
const Foam::word Foam::radiation::viewFactor::viewFactorWalls
    = "viewFactorWall";
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
void Foam::radiation::viewFactor::initialise()
{
    const polyBoundaryMesh& coarsePatches = coarseMesh_.boundaryMesh();
 
    selectedPatches_ = mesh_.boundaryMesh().findIndices(viewFactorWalls);
    forAll(selectedPatches_, i)
    {
        const label patchI = selectedPatches_[i];
        nLocalCoarseFaces_ += coarsePatches[patchI].size();
    }
 
    if (debug)
    {
        Pout<< "radiation::viewFactor::initialise() Selected patches:"
            << selectedPatches_ << endl;
        Pout<< "radiation::viewFactor::initialise() Number of coarse faces:"
            << nLocalCoarseFaces_ << endl;
    }
 
    totalNCoarseFaces_ = nLocalCoarseFaces_;
    reduce(totalNCoarseFaces_, sumOp<label>());
 
    if (debug && Pstream::master())
    {
        InfoInFunction
            << "Total number of clusters : " << totalNCoarseFaces_ << endl;
    }
 
    map_.reset
    (
        new IOmapDistribute
        (
            IOobject
            (
                "mapDist",
                mesh_.facesInstance(),
                mesh_,
                IOobject::MUST_READ,
                IOobject::NO_WRITE,
                false
            )
        )
    );
 
    scalarListIOList FmyProc
    (
        IOobject
        (
            "F",
            mesh_.facesInstance(),
            mesh_,
            IOobject::MUST_READ,
            IOobject::NO_WRITE,
            false
        )
    );
 
    labelListIOList globalFaceFaces
    (
        IOobject
        (
            "globalFaceFaces",
            mesh_.facesInstance(),
            mesh_,
            IOobject::MUST_READ,
            IOobject::NO_WRITE,
            false
        )
    );
 
    List<labelListList> globalFaceFacesProc(Pstream::nProcs());
    globalFaceFacesProc[Pstream::myProcNo()] = globalFaceFaces;
    Pstream::gatherList(globalFaceFacesProc);
 
    List<scalarListList> F(Pstream::nProcs());
    F[Pstream::myProcNo()] = FmyProc;
    Pstream::gatherList(F);
 
    globalIndex globalNumbering(nLocalCoarseFaces_);
 
    if (Pstream::master())
    {
        Fmatrix_.reset
        (
            new scalarSquareMatrix(totalNCoarseFaces_, totalNCoarseFaces_, 0.0)
        );
 
        if (debug)
        {
            InfoInFunction
                << "Insert elements in the matrix..." << endl;
        }
 
        for (label procI = 0; procI < Pstream::nProcs(); procI++)
        {
            insertMatrixElements
            (
                globalNumbering,
                procI,
                globalFaceFacesProc[procI],
                F[procI],
                Fmatrix_()
            );
        }
 
 
        bool smoothing = readBool(coeffs_.lookup("smoothing"));
        if (smoothing)
        {
            if (debug)
            {
                InfoInFunction
                    << "Smoothing the matrix..." << endl;
            }
 
            for (label i=0; i<totalNCoarseFaces_; i++)
            {
                scalar sumF = 0.0;
                for (label j=0; j<totalNCoarseFaces_; j++)
                {
                    sumF += Fmatrix_()[i][j];
                }
                scalar delta = sumF - 1.0;
                for (label j=0; j<totalNCoarseFaces_; j++)
                {
                    Fmatrix_()[i][j] *= (1.0 - delta/(sumF + 0.001));
                }
            }
        }
 
        constEmissivity_ = readBool(coeffs_.lookup("constantEmissivity"));
        if (constEmissivity_)
        {
            CLU_.reset
            (
                new scalarSquareMatrix
                (
                    totalNCoarseFaces_,
                    totalNCoarseFaces_,
                    0.0
                )
            );
 
            pivotIndices_.setSize(CLU_().n());
        }
    }
 
    if (this->found("useSolarLoad"))
    {
        this->lookup("useSolarLoad") >> useSolarLoad_;
    }
 
    if (useSolarLoad_)
    {
        const dictionary& solarDict = this->subDict("solarLoarCoeffs");
        solarLoad_.reset
        (
            new solarLoad(solarDict, T_, externalRadHeatFieldName_)
        );
 
        if (solarLoad_->nBands() > 1)
        {
            FatalErrorInFunction
                << "Requested solar radiation with fvDOM. Using "
                << "more thant one band for the solar load is not allowed"
                << abort(FatalError);
        }
 
        Info<< "Creating Solar Load Model " << nl;
    }
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::radiation::viewFactor::viewFactor(const volScalarField& T)
:
    radiationModel(typeName, T),
    finalAgglom_
    (
        IOobject
        (
            "finalAgglom",
            mesh_.facesInstance(),
            mesh_,
            IOobject::MUST_READ,
            IOobject::NO_WRITE,
            false
        )
    ),
    map_(),
    coarseMesh_
    (
        IOobject
        (
            "coarse:" + mesh_.name(),
            mesh_.polyMesh::instance(),
            mesh_.time(),
            IOobject::NO_READ,
            IOobject::NO_WRITE
        ),
        mesh_,
        finalAgglom_
    ),
    Qr_
    (
        IOobject
        (
            "Qr",
            mesh_.time().timeName(),
            mesh_,
            IOobject::MUST_READ,
            IOobject::AUTO_WRITE
        ),
        mesh_
    ),
    Fmatrix_(),
    CLU_(),
    selectedPatches_(mesh_.boundary().size(), -1),
    totalNCoarseFaces_(0),
    nLocalCoarseFaces_(0),
    constEmissivity_(false),
    iterCounter_(0),
    pivotIndices_(0),
    useSolarLoad_(false),
    solarLoad_()
{
    initialise();
}
 
 
Foam::radiation::viewFactor::viewFactor
(
    const dictionary& dict,
    const volScalarField& T
)
:
    radiationModel(typeName, dict, T),
    finalAgglom_
    (
        IOobject
        (
            "finalAgglom",
            mesh_.facesInstance(),
            mesh_,
            IOobject::MUST_READ,
            IOobject::NO_WRITE,
            false
        )
    ),
    map_(),
    coarseMesh_
    (
        IOobject
        (
            "coarse:" + mesh_.name(),
            mesh_.polyMesh::instance(),
            mesh_.time(),
            IOobject::NO_READ,
            IOobject::NO_WRITE
        ),
        mesh_,
        finalAgglom_
    ),
    Qr_
    (
        IOobject
        (
            "Qr",
            mesh_.time().timeName(),
            mesh_,
            IOobject::MUST_READ,
            IOobject::AUTO_WRITE
        ),
        mesh_
    ),
    Fmatrix_(),
    CLU_(),
    selectedPatches_(mesh_.boundary().size(), -1),
    totalNCoarseFaces_(0),
    nLocalCoarseFaces_(0),
    constEmissivity_(false),
    iterCounter_(0),
    pivotIndices_(0),
    useSolarLoad_(false),
    solarLoad_()
{
    initialise();
}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
Foam::radiation::viewFactor::~viewFactor()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
bool Foam::radiation::viewFactor::read()
{
    if (radiationModel::read())
    {
        return true;
    }
    else
    {
        return false;
    }
}
 
 
void Foam::radiation::viewFactor::insertMatrixElements
(
    const globalIndex& globalNumbering,
    const label procI,
    const labelListList& globalFaceFaces,
    const scalarListList& viewFactors,
    scalarSquareMatrix& Fmatrix
)
{
    forAll(viewFactors, faceI)
    {
        const scalarList& vf = viewFactors[faceI];
        const labelList& globalFaces = globalFaceFaces[faceI];
 
        label globalI = globalNumbering.toGlobal(procI, faceI);
        forAll(globalFaces, i)
        {
            Fmatrix[globalI][globalFaces[i]] = vf[i];
        }
    }
}
 
 
void Foam::radiation::viewFactor::calculate()
{
    // Store previous iteration
    Qr_.storePrevIter();
 
    if (useSolarLoad_)
    {
        solarLoad_->calculate();
    }
 
    scalarField compactCoarseT(map_->constructSize(), 0.0);
    scalarField compactCoarseE(map_->constructSize(), 0.0);
    scalarField compactCoarseHo(map_->constructSize(), 0.0);
 
    globalIndex globalNumbering(nLocalCoarseFaces_);
 
    // Fill local averaged(T), emissivity(E) and external heatFlux(Ho)
    DynamicList<scalar> localCoarseTave(nLocalCoarseFaces_);
    DynamicList<scalar> localCoarseEave(nLocalCoarseFaces_);
    DynamicList<scalar> localCoarseHoave(nLocalCoarseFaces_);
 
    const boundaryRadiationProperties& boundaryRadiation =
        boundaryRadiationProperties::New(mesh_);
 
    forAll(selectedPatches_, i)
    {
        label patchID = selectedPatches_[i];
 
        const scalarField& Tp = T_.boundaryField()[patchID];
        const scalarField& sf = mesh_.magSf().boundaryField()[patchID];
 
        fvPatchScalarField& QrPatch = Qr_.boundaryField()[patchID];
 
        greyDiffusiveViewFactorFixedValueFvPatchScalarField& Qrp =
            refCast
            <
                greyDiffusiveViewFactorFixedValueFvPatchScalarField
            >(QrPatch);
 
        const tmp<scalarField> teb = boundaryRadiation.emissivity(patchID);
        const scalarField& eb = teb();
 
        const tmp<scalarField> tHoi = Qrp.Qro();
        const scalarField& Hoi = tHoi();
 
        const polyPatch& pp = coarseMesh_.boundaryMesh()[patchID];
        const labelList& coarsePatchFace = coarseMesh_.patchFaceMap()[patchID];
 
        scalarList Tave(pp.size(), 0.0);
        scalarList Eave(Tave.size(), 0.0);
        scalarList Hoiave(Tave.size(), 0.0);
 
        if (pp.size() > 0)
        {
            const labelList& agglom = finalAgglom_[patchID];
            label nAgglom = max(agglom) + 1;
 
            labelListList coarseToFine(invertOneToMany(nAgglom, agglom));
 
            forAll(coarseToFine, coarseI)
            {
                const label coarseFaceID = coarsePatchFace[coarseI];
                const labelList& fineFaces = coarseToFine[coarseFaceID];
                UIndirectList<scalar> fineSf
                (
                    sf,
                    fineFaces
                );
                scalar area = sum(fineSf());
                // Temperature, emissivity and external flux area weighting
                forAll(fineFaces, j)
                {
                    label faceI = fineFaces[j];
                    Tave[coarseI] += (Tp[faceI]*sf[faceI])/area;
                    Eave[coarseI] += (eb[faceI]*sf[faceI])/area;
                    Hoiave[coarseI] += (Hoi[faceI]*sf[faceI])/area;
                }
            }
        }
 
        localCoarseTave.append(Tave);
        localCoarseEave.append(Eave);
        localCoarseHoave.append(Hoiave);
    }
 
    // Fill the local values to distribute
    SubList<scalar>(compactCoarseT,nLocalCoarseFaces_).assign(localCoarseTave);
    SubList<scalar>(compactCoarseE,nLocalCoarseFaces_).assign(localCoarseEave);
    SubList<scalar>
        (compactCoarseHo,nLocalCoarseFaces_).assign(localCoarseHoave);
 
    // Distribute data
    map_->distribute(compactCoarseT);
    map_->distribute(compactCoarseE);
    map_->distribute(compactCoarseHo);
 
    // Distribute local global ID
    labelList compactGlobalIds(map_->constructSize(), 0.0);
 
    labelList localGlobalIds(nLocalCoarseFaces_);
 
    for(label k = 0; k < nLocalCoarseFaces_; k++)
    {
        localGlobalIds[k] = globalNumbering.toGlobal(Pstream::myProcNo(), k);
    }
 
    SubList<label>
    (
        compactGlobalIds,
        nLocalCoarseFaces_
    ).assign(localGlobalIds);
 
    map_->distribute(compactGlobalIds);
 
    // Create global size vectors
    scalarField T(totalNCoarseFaces_, 0.0);
    scalarField E(totalNCoarseFaces_, 0.0);
    scalarField QrExt(totalNCoarseFaces_, 0.0);
 
    // Fill lists from compact to global indexes.
    forAll(compactCoarseT, i)
    {
        T[compactGlobalIds[i]] = compactCoarseT[i];
        E[compactGlobalIds[i]] = compactCoarseE[i];
        QrExt[compactGlobalIds[i]] = compactCoarseHo[i];
    }
 
    Pstream::listCombineGather(T, maxEqOp<scalar>());
    Pstream::listCombineGather(E, maxEqOp<scalar>());
    Pstream::listCombineGather(QrExt, maxEqOp<scalar>());
 
    Pstream::listCombineScatter(T);
    Pstream::listCombineScatter(E);
    Pstream::listCombineScatter(QrExt);
 
    // Net radiation
    scalarField q(totalNCoarseFaces_, 0.0);
 
    if (Pstream::master())
    {
        // Variable emissivity
        if (!constEmissivity_)
        {
            scalarSquareMatrix C(totalNCoarseFaces_, totalNCoarseFaces_, 0.0);
 
            for (label i=0; i<totalNCoarseFaces_; i++)
            {
                for (label j=0; j<totalNCoarseFaces_; j++)
                {
                    scalar invEj = 1.0/E[j];
                    scalar sigmaT4 =
                        physicoChemical::sigma.value()*pow(T[j], 4.0);
 
                    if (i==j)
                    {
                        C[i][j] = invEj - (invEj - 1.0)*Fmatrix_()[i][j];
                        q[i] += (Fmatrix_()[i][j] - 1.0)*sigmaT4 - QrExt[j];
                    }
                    else
                    {
                        C[i][j] = (1.0 - invEj)*Fmatrix_()[i][j];
                        q[i] += Fmatrix_()[i][j]*sigmaT4;
                    }
 
                }
            }
 
            Info<< "\nSolving view factor equations..." << endl;
 
            // Negative coming into the fluid
            LUsolve(C, q);
        }
        else //Constant emissivity
        {
            // Initial iter calculates CLU and chaches it
            if (iterCounter_ == 0)
            {
                for (label i=0; i<totalNCoarseFaces_; i++)
                {
                    for (label j=0; j<totalNCoarseFaces_; j++)
                    {
                        scalar invEj = 1.0/E[j];
                        if (i==j)
                        {
                            CLU_()[i][j] = invEj-(invEj-1.0)*Fmatrix_()[i][j];
                        }
                        else
                        {
                            CLU_()[i][j] = (1.0 - invEj)*Fmatrix_()[i][j];
                        }
                    }
                }
 
                if (debug)
                {
                    InfoInFunction
                        << "\nDecomposing C matrix..." << endl;
                }
 
                LUDecompose(CLU_(), pivotIndices_);
            }
 
            for (label i=0; i<totalNCoarseFaces_; i++)
            {
                for (label j=0; j<totalNCoarseFaces_; j++)
                {
                    scalar sigmaT4 =
                        constant::physicoChemical::sigma.value()
                       *pow(T[j], 4.0);
 
                    if (i==j)
                    {
                        q[i] += (Fmatrix_()[i][j] - 1.0)*sigmaT4  - QrExt[j];
                    }
                    else
                    {
                        q[i] += Fmatrix_()[i][j]*sigmaT4;
                    }
                }
            }
 
            if (debug)
            {
                InfoInFunction
                    << "\nLU Back substitute C matrix.." << endl;
            }
 
            LUBacksubstitute(CLU_(), pivotIndices_, q);
            iterCounter_ ++;
        }
    }
 
    // Scatter q and fill Qr
    Pstream::listCombineScatter(q);
    Pstream::listCombineGather(q, maxEqOp<scalar>());
 
 
    label globCoarseId = 0;
    forAll(selectedPatches_, i)
    {
        const label patchID = selectedPatches_[i];
        const polyPatch& pp = mesh_.boundaryMesh()[patchID];
        if (pp.size() > 0)
        {
            scalarField& Qrp = Qr_.boundaryField()[patchID];
            const scalarField& sf = mesh_.magSf().boundaryField()[patchID];
            const labelList& agglom = finalAgglom_[patchID];
            label nAgglom = max(agglom)+1;
 
            labelListList coarseToFine(invertOneToMany(nAgglom, agglom));
 
            const labelList& coarsePatchFace =
                coarseMesh_.patchFaceMap()[patchID];
 
            scalar heatFlux = 0.0;
            forAll(coarseToFine, coarseI)
            {
                label globalCoarse =
                    globalNumbering.toGlobal(Pstream::myProcNo(), globCoarseId);
                const label coarseFaceID = coarsePatchFace[coarseI];
                const labelList& fineFaces = coarseToFine[coarseFaceID];
                forAll(fineFaces, k)
                {
                    label faceI = fineFaces[k];
 
                    Qrp[faceI] = q[globalCoarse];
                    heatFlux += Qrp[faceI]*sf[faceI];
                }
                globCoarseId ++;
            }
        }
    }
 
    if (debug)
    {
        forAll(Qr_.boundaryField(), patchID)
        {
            const scalarField& Qrp = Qr_.boundaryField()[patchID];
            const scalarField& magSf = mesh_.magSf().boundaryField()[patchID];
            scalar heatFlux = gSum(Qrp*magSf);
 
            InfoInFunction
                << "Total heat transfer rate at patch: "
                << patchID << " "
                << heatFlux << endl;
        }
    }
 
    // Relax Qr if necessary
    Qr_.relax();
}
 
 
Foam::tmp<Foam::volScalarField> Foam::radiation::viewFactor::Rp() const
{
    return tmp<volScalarField>
    (
        new volScalarField
        (
            IOobject
            (
                "Rp",
                mesh_.time().timeName(),
                mesh_,
                IOobject::NO_READ,
                IOobject::NO_WRITE,
                false
            ),
            mesh_,
            dimensionedScalar
            (
                "zero",
                dimMass/pow3(dimTime)/dimLength/pow4(dimTemperature),
                0.0
            )
        )
    );
}
 
 
Foam::tmp<Foam::DimensionedField<Foam::scalar, Foam::volMesh> >
Foam::radiation::viewFactor::Ru() const
{
    return tmp<DimensionedField<scalar, volMesh> >
    (
        new DimensionedField<scalar, volMesh>
        (
            IOobject
            (
                "Ru",
                mesh_.time().timeName(),
                mesh_,
                IOobject::NO_READ,
                IOobject::NO_WRITE,
                false
            ),
            mesh_,
            dimensionedScalar("zero", dimMass/dimLength/pow3(dimTime), 0.0)
        )
    );
}
 
// ************************************************************************* //