Added thermal support in the porous zone. Vanja Skuric
This commit is contained in:
Hrvoje Jasak
parent
957e6abe8c
commit
b33cc9e828
5 changed files with 489 additions and 2 deletions
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@ -76,7 +76,17 @@ Foam::porousZone::porousZone
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C0_(0),
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C1_(0),
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D_("D", dimensionSet(0, -2, 0, 0, 0), tensor::zero),
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F_("F", dimensionSet(0, -1, 0, 0, 0), tensor::zero)
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F_("F", dimensionSet(0, -1, 0, 0, 0), tensor::zero),
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Maux_(0),
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Taux_(0),
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caux_(0),
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Qepsilon_(0),
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Tauxrelax_(0),
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nCellsAuxInlet_(0),
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firstCell_(0),
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auxUnitVector_(vector::zero),
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nVerticalCells_(0)
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{
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Info<< "Creating porous zone: " << name_ << endl;
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@ -191,6 +201,37 @@ Foam::porousZone::porousZone
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"nor Darcy-Forchheimer law (d/f) specified"
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<< exit(FatalIOError);
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}
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// Heat rate value and temperature of heat exchanger
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if (const dictionary* dictPtr = dict_.subDictPtr("heatTransfer"))
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{
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Info<< "Reading porous heatTransfer: Maux and Taux" << nl;
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dictPtr->lookup("Maux") >> Maux_;
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dictPtr->lookup("Taux") >> Taux_;
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dictPtr->lookup("caux") >> caux_;
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dictPtr->lookup("Qepsilon") >> Qepsilon_;
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dictPtr->lookup("firstCell") >> firstCell_;
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dictPtr->lookup("auxUnitVector") >> auxUnitVector_;
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dictPtr->lookup("nVerticalCells") >> nVerticalCells_;
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dictPtr->lookup("nCellsAuxInlet") >> nCellsAuxInlet_;
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dictPtr->lookup("TauxRelax") >> Tauxrelax_;
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Info<< "Maux = " << Maux_ <<
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" ,Taux = " << Taux_ <<
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" ,caux = " << caux_ <<
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" ,nCellsAuxInlet = " << nCellsAuxInlet_ <<
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" ,Qepsilon = " << Qepsilon_ << nl;
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}
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else
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{
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FatalIOErrorIn
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(
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"Foam::porousZone::porousZone"
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"(const fvMesh&, const word&, const dictionary&)",
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dict_
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) << "\"heatTransfer\" dictionary not specified"
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<< exit(FatalIOError);
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}
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}
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@ -360,6 +401,245 @@ void Foam::porousZone::addResistance
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}
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void Foam::porousZone::addHeatResistance
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(
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fvScalarMatrix& hTEqn,
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const volScalarField& T,
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volScalarField& Taux,
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volScalarField& Qaux,
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const volVectorField& U,
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const volScalarField& Macro,
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const volScalarField& posFlux
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) const
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{
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if (cellZoneID_ == -1 && mag(Maux_) < SMALL)
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{
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return;
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}
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scalarField& QSource = hTEqn.source();
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const scalarField& Ti = T.internalField();
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scalarField& Tauxi = Taux.internalField();
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scalarField& Qauxi = Qaux.internalField();
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const vectorField& Ui = U.internalField();
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const scalarField& Macroi = Macro.internalField();
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const scalarField& posFluxi = posFlux.internalField();
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if (hTEqn.dimensions() == dimensionSet(1, -2, -3, 0, 0))
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{
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addHeatSource
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(
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Macroi,
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posFluxi,
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QSource,
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Qauxi,
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Ti,
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Tauxi,
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Ui,
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mesh_.lookupObject<volScalarField>("rho")
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);
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}
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else if (hTEqn.dimensions() == dimensionSet(0, 3, -1, 1, 0))
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{
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addHeatSource
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(
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Macroi,
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posFluxi,
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QSource,
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Qauxi,
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Ti,
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Tauxi,
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Ui,
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geometricOneField()
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);
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}
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else
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{
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Info<< "No hEqn or TEqn, exiting" << nl;
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return;
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}
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}
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void Foam::porousZone::macroCellOrder
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(
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volScalarField& Taux,
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volScalarField& Macro,
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volScalarField& posFlux,
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const surfaceScalarField& phi
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) const
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{
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Info << "Creating cellsOrdered list " << nl << endl;
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const labelList& cells = mesh_.cellZones()[cellZoneID_];
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const vectorField& cellsCellCenter = mesh_.cellCentres();
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scalarField& Tauxi = Taux.internalField();
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label nCellsAuxInlet(nCellsAuxInlet_);
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label firstCell(firstCell_);
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label nVerticalCells(nVerticalCells_);
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vector auxUnitVector(auxUnitVector_);
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labelList cellsAuxInlet(nCellsAuxInlet, -1);
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cellsAuxInlet[0] = firstCell;
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// - Creating horizontal list of cells, cellsAuxInlet[nCellsAuxInlet]
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label newcounter = 1;
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forAll (cellsAuxInlet, i)
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{
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const labelList& cellNb = mesh_.cellCells(cellsAuxInlet[i]);
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forAll (cellNb, ii)
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{
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bool isInsideNb = false;
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forAll (cellsAuxInlet, iii)
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{
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if (cellNb[ii] == cellsAuxInlet[iii]) isInsideNb = true;
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}
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if (!isInsideNb)
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{
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if (mesh_.cellZones()[cellZoneID_].whichCell(cellNb[ii]) != -1)
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{
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if
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(
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mag
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(
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(
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(
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cellsCellCenter[cellsAuxInlet[i]]
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- cellsCellCenter[cellNb[ii]]
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)/
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mag
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(
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cellsCellCenter[cellsAuxInlet[i]]
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- cellsCellCenter[cellNb[ii]]
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)
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)
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& auxUnitVector
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) < 0.5
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)
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{
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cellsAuxInlet[newcounter] = cellNb[ii];
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++newcounter;
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}
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}
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}
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}
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}
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scalarField& Macroi = Macro.internalField();
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labelList cellsOrdered(cells.size(), -1);
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// Writing horizontal cells into list cellsOrdered[cells.size()]
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forAll (cellsAuxInlet, i)
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{
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cellsOrdered[i*nVerticalCells] = cellsAuxInlet[i];
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}
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// Creating cellsOrdered list of ordered horizontal cells
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label counter = 1;
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forAll (cellsOrdered, i)
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{
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Macroi[cellsOrdered[i]] = i;
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Tauxi[cellsOrdered[i]] = Taux_;
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if ((i > 1) && (i % nVerticalCells == 0))
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{
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++counter;
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}
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const labelList& cellNb = mesh_.cellCells(cellsOrdered[i]);
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forAll (cellNb, iii)
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{
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bool isInsideNb = false;
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forAll (cellsOrdered, iiii)
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{
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if (cellNb[iii] == cellsOrdered[iiii])
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{
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isInsideNb = true;
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}
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}
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if (!isInsideNb)
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{
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if (mesh_.cellZones()[cellZoneID_].whichCell(cellNb[iii]) != -1)
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{
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if
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(
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mag
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(
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(
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(
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cellsCellCenter[cellsOrdered[i]]
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- cellsCellCenter[cellNb[iii]]
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)/
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mag
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(
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cellsCellCenter[cellsOrdered[i]]
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- cellsCellCenter[cellNb[iii]]
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)
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)
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& auxUnitVector
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) > 0.85
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)
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{
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cellsOrdered[counter] = cellNb[iii];
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++counter;
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}
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}
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}
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}
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}
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scalarField& posFluxi = posFlux.internalField();
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// - Calculating mass flow through each cell
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forAll (cellsOrdered, i)
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{
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const labelList& cellFaces = mesh_.cells()[cellsOrdered[i]];
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forAll (cellFaces,ii)
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{
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label faceI = cellFaces[ii];
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if (mesh_.isInternalFace(faceI))
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{
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if (mesh_.faceOwner()[faceI] == cellsOrdered[i])
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{
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if (phi.internalField()[faceI] > 0.0)
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{
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posFluxi[cellsOrdered[i]] += phi.internalField()[faceI];
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}
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}
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else
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{
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if (phi.internalField()[faceI] < 0.0)
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{
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posFluxi[cellsOrdered[i]] += -phi.internalField()[faceI];
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}
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}
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}
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else
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{
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const label patchI = mesh_.boundaryMesh().whichPatch(faceI);
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const label faceIL = mesh_.boundaryMesh()[patchI].whichFace(faceI);
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if (patchI < 0)
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{
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Info << "patchI < 0 " << endl;
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return;
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}
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if (phi.boundaryField()[patchI][faceIL] > 0.0)
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{
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posFluxi[cellsOrdered[i]] += phi.boundaryField()[patchI][faceIL];
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}
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}
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}
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}
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}
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void Foam::porousZone::writeDict(Ostream& os, bool subDict) const
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{
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if (subDict)
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@ -402,6 +682,13 @@ void Foam::porousZone::writeDict(Ostream& os, bool subDict) const
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dictPtr->write(os);
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}
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// Heat transfer inputs
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if (const dictionary* dictPtr = dict_.subDictPtr("heatTransfer"))
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{
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os << indent << "heatTransfer";
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dictPtr->write(os);
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}
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os << decrIndent << indent << token::END_BLOCK << endl;
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}
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@ -39,6 +39,15 @@ Description
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S = - \rho C_0 |U|^{(C_1 - 1)/2} U
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@f]
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In the porous zone a heat source using the single stream heat exchanger
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approach:
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heatTransfer
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@f[
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Qtot = const //[J/s]
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Tref = const //[K]
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@f]
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Darcy-Forchheimer (@e d and @e f parameters)
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@f[
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S = - (\mu \, d + \frac{\rho |U|}{2} \, f) U
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@ -129,6 +138,36 @@ class porousZone
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//- Forchheimer coefficient
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dimensionedTensor F_;
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//- Mass flow of aux fluid
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scalar Maux_;
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//- Inlet temperature of aux fluid
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scalar Taux_;
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//- Specific heat capacity of coolant
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scalar caux_;
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//- Epsilon for Single Effectiveness HX
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scalar Qepsilon_;
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//- Relaxation factor for Taux
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scalar Tauxrelax_;
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// Geometrical description of the porous heat exchanger
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//- Number of inlet cells for aux fluid
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label nCellsAuxInlet_;
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//- First inlet cell for aux fluid
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label firstCell_;
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//- Inlet direction for auxiliary fluid
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vector auxUnitVector_;
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//- Number of vertical cells for auxiliary fluid
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label nVerticalCells_;
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// Private Member Functions
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@ -159,7 +198,6 @@ class porousZone
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const vectorField& U
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) const;
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//- Power-law resistance
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template<class RhoFieldType>
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void addPowerLawResistance
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@ -181,6 +219,20 @@ class porousZone
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const vectorField& U
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) const;
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//- Heat source
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template<class RhoFieldType>
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void addHeatSource
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(
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const scalarField& Macro,
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const scalarField& posFlux,
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scalarField& QSource,
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scalarField& Qaux,
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const scalarField& T,
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scalarField& Taux,
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const vectorField& U,
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const RhoFieldType& rho
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) const;
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//- Disallow default bitwise copy construct
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porousZone(const porousZone&);
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@ -314,6 +366,27 @@ public:
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bool correctAUprocBC = true
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) const;
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//- Add the heat source in enthalpy equation
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void addHeatResistance
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(
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fvScalarMatrix& hTEqn,
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const volScalarField& T,
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volScalarField& Taux,
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volScalarField& Qaux,
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const volVectorField& U,
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const volScalarField& Macro,
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const volScalarField& posFlux
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) const;
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//- Order cells for Dual Stream model
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void macroCellOrder
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(
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volScalarField& Taux,
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volScalarField& Macro,
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volScalarField& posFlux,
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const surfaceScalarField& phi
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) const;
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//- Write the porousZone dictionary
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virtual void writeDict(Ostream&, bool subDict = true) const;
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@ -132,4 +132,72 @@ void Foam::porousZone::addViscousInertialResistance
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}
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template<class RhoFieldType>
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void Foam::porousZone::addHeatSource
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(
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const scalarField& Macro,
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const scalarField& posFlux,
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scalarField& QSource,
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scalarField& Qauxi,
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const scalarField& T,
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scalarField& Tauxi,
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const vectorField& U,
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const RhoFieldType& rho
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) const
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{
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// - Dual stream model (Single Effectiveness Model)
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const scalarField Tauxi_old = Tauxi; // create storePrevIter()
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const scalarField dT = Tauxi - T;
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const label nMacro(nCellsAuxInlet_*nVerticalCells_);
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scalarList Tmacro(nMacro, 0.0);
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scalarList dTaux(nMacro, 0.0);
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scalar QSum(0.0);
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const scalar Taux_relax(Tauxrelax_);
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const scalar c_aux(caux_);
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const scalar c_pri(1009.0);
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const scalar qm_aux(Maux_);
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const scalar qm_auxi = qm_aux/nCellsAuxInlet_;
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const scalar T_aux(Taux_);
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const scalar rho_pri(1.1021);
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const scalar Qeps(Qepsilon_);
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const labelList& cells = mesh_.cellZones()[cellZoneID_];
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forAll(cells, i)
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{
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scalar Qcell = Qeps*rho_pri*c_pri*posFlux[cells[i]]*dT[cells[i]];
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Qauxi[cells[i]] = Qcell; // heat in each macro(cell)
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const int macro = Macro[cells[i]];
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dTaux[macro] = Qcell/(c_aux*qm_auxi); // deltaTaux in each macro(cell)
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QSource[cells[i]] += Qcell/(rho_pri*c_pri); // adding Heat to equation
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QSum += Qcell; // summing for total heat of HX
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}
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reduce(dTaux, sumOp<scalarList>());
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Tmacro[0] = T_aux;
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forAll (Tmacro, i)
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{
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if (i > 0) Tmacro[i] = Tmacro[i-1] - dTaux[i-1];
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if ((i > 0) && (i % nVerticalCells_ == 0)) Tmacro[i] = T_aux;
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}
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reduce(QSum, sumOp<scalar>());
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Info << "Heat exchanger: " << name_ << endl;
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Info << "Q = " << QSum << endl;
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Info << "deltaT = " << QSum/(qm_aux*c_aux) << endl;
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forAll(cells, i)
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{
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const int macro = Macro[cells[i]];
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Tauxi[cells[i]] = Tauxi_old[cells[i]]
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// upwind scheme for Aux fluid (Tmacro = inlet temp)
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+ Taux_relax*(Tmacro[macro] - Tauxi_old[cells[i]]);
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}
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}
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// ************************************************************************* //
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@ -88,6 +88,38 @@ void Foam::porousZones::addResistance
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}
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void Foam::porousZones::addHeatResistance
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(
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fvScalarMatrix& hTEqn,
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const volScalarField& T,
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volScalarField& Taux,
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volScalarField& Qaux,
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const volVectorField& U,
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const volScalarField& Macro,
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const volScalarField& posFlux
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) const
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{
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forAll(*this, i)
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{
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operator[](i).addHeatResistance(hTEqn, T, Taux, Qaux, U, Macro, posFlux);
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}
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}
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//- Order cells for Dual Stream model
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void Foam::porousZones::macroCellOrder
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(
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volScalarField& Taux,
|
||||
volScalarField& Macro,
|
||||
volScalarField& posFlux,
|
||||
const surfaceScalarField& phi
|
||||
) const
|
||||
{
|
||||
forAll(*this, i)
|
||||
{
|
||||
operator[](i).macroCellOrder(Taux, Macro, posFlux, phi);
|
||||
}
|
||||
}
|
||||
|
||||
bool Foam::porousZones::readData(Istream& is)
|
||||
{
|
||||
clear();
|
||||
|
|
|
|||
|
|
@ -45,6 +45,11 @@ Description
|
|||
d d [0 -2 0 0 0] (-1000 -1000 0.50753e+08);
|
||||
f f [0 -1 0 0 0] (-1000 -1000 12.83);
|
||||
}
|
||||
heatTransfer
|
||||
{
|
||||
Qtot 50; //[J/s]
|
||||
Tref 273.15; //[K]
|
||||
}
|
||||
}
|
||||
)
|
||||
@endverbatim
|
||||
|
|
@ -150,6 +155,28 @@ public:
|
|||
volTensorField& AU
|
||||
) const;
|
||||
|
||||
//- Add the heat source contribution to enalphy equation (energy
|
||||
// equation)
|
||||
void addHeatResistance
|
||||
(
|
||||
fvScalarMatrix& hTEqn,
|
||||
const volScalarField& T,
|
||||
volScalarField& Taux,
|
||||
volScalarField& Qaux,
|
||||
const volVectorField& U,
|
||||
const volScalarField& Macro,
|
||||
const volScalarField& posFlux
|
||||
) const;
|
||||
|
||||
//- Order cells for Dual Stream model
|
||||
void macroCellOrder
|
||||
(
|
||||
volScalarField& Taux,
|
||||
volScalarField& Macro,
|
||||
volScalarField& posFlux,
|
||||
const surfaceScalarField& phi
|
||||
) const;
|
||||
|
||||
//- read modified data
|
||||
virtual bool readData(Istream&);
|
||||
|
||||
|
|
|
|||
Reference in a new issue