Merge branch 'feature-extension-effectivenessHeatExchangerSource' into 'develop'
ENH: effectivenessHeatExchangerSource: add writeFile functionality See merge request Development/openfoam!534
This commit is contained in:
Andrew Heather
commit
da4827d7d2
@ -6,7 +6,7 @@
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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Copyright (C) 2013-2015 OpenFOAM Foundation
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Copyright (C) 2016-2021 OpenCFD Ltd.
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Copyright (C) 2016-2022 OpenCFD Ltd.
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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@ -75,7 +75,7 @@ void Foam::fv::effectivenessHeatExchangerSource::initialise()
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label count = 0;
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forAll(fZone, i)
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{
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label facei = fZone[i];
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const label facei = fZone[i];
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label faceId = -1;
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label facePatchId = -1;
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if (mesh_.isInternalFace(facei))
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@ -125,6 +125,25 @@ void Foam::fv::effectivenessHeatExchangerSource::initialise()
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}
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void Foam::fv::effectivenessHeatExchangerSource::writeFileHeader(Ostream& os)
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{
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writeFile::writeHeader(os, "Effectiveness heat exchanger source");
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writeFile::writeCommented(os, "Time");
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writeFile::writeTabbed(os, "Net mass flux [kg/s]");
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writeFile::writeTabbed(os, "Total heat exchange [W]");
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writeFile::writeTabbed(os, "Secondary inlet T [K]");
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writeFile::writeTabbed(os, "Tref [K]");
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writeFile::writeTabbed(os, "Effectiveness");
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if (secondaryCpPtr_)
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{
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writeFile::writeTabbed(os, "Secondary outlet T [K]");
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}
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os << endl;
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}
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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Foam::fv::effectivenessHeatExchangerSource::effectivenessHeatExchangerSource
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@ -136,15 +155,26 @@ Foam::fv::effectivenessHeatExchangerSource::effectivenessHeatExchangerSource
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)
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:
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fv::cellSetOption(name, modelType, dict, mesh),
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writeFile(mesh, name, modelType, coeffs_),
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userPrimaryInletT_(false),
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targetQdotActive_(false),
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secondaryCpPtr_
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(
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Function1<scalar>::NewIfPresent
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(
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"secondaryCp",
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coeffs_,
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word::null,
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&mesh
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)
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),
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eTable_(),
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targetQdotCalcInterval_(5),
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secondaryMassFlowRate_(0),
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secondaryInletT_(0),
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primaryInletT_(0),
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userPrimaryInletT_(false),
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targetQdotActive_(false),
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targetQdot_(0),
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targetQdotCalcInterval_(5),
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targetQdotRelax_(0.5),
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eTable_(),
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UName_("U"),
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TName_("T"),
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phiName_("phi"),
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@ -167,6 +197,8 @@ Foam::fv::effectivenessHeatExchangerSource::effectivenessHeatExchangerSource
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eTable_.reset(new interpolation2DTable<scalar>(coeffs_));
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initialise();
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writeFileHeader(file());
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}
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@ -180,12 +212,10 @@ void Foam::fv::effectivenessHeatExchangerSource::addSup
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)
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{
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const auto& thermo = mesh_.lookupObject<basicThermo>(basicThermo::dictName);
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const auto& phi = mesh_.lookupObject<surfaceScalarField>(phiName_);
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const auto& T = mesh_.lookupObject<volScalarField>(TName_);
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const surfaceScalarField Cpf(fvc::interpolate(thermo.Cp()));
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const auto& phi = mesh_.lookupObject<surfaceScalarField>(phiName_);
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const auto& T = mesh_.lookupObject<volScalarField>(TName_);
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const surfaceScalarField Tf(fvc::interpolate(T));
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scalar sumPhi = 0;
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@ -194,29 +224,30 @@ void Foam::fv::effectivenessHeatExchangerSource::addSup
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scalar primaryInletTfMean = 0;
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forAll(faceId_, i)
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{
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label facei = faceId_[i];
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const label facei = faceId_[i];
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if (facePatchId_[i] != -1)
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{
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label patchi = facePatchId_[i];
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scalar phii = phi.boundaryField()[patchi][facei]*faceSign_[i];
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const label patchi = facePatchId_[i];
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const scalar phii = phi.boundaryField()[patchi][facei]*faceSign_[i];
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const scalar magPhii = mag(phii);
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sumPhi += phii;
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scalar Cpfi = Cpf.boundaryField()[patchi][facei];
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scalar Tfi = Tf.boundaryField()[patchi][facei];
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scalar magPhii = mag(phii);
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sumMagPhi += magPhii;
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const scalar Cpfi = Cpf.boundaryField()[patchi][facei];
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const scalar Tfi = Tf.boundaryField()[patchi][facei];
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CpfMean += Cpfi*magPhii;
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primaryInletTfMean += Tfi*magPhii;
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}
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else
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{
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scalar phii = phi[facei]*faceSign_[i];
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scalar magPhii = mag(phii);
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const scalar phii = phi[facei]*faceSign_[i];
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const scalar magPhii = mag(phii);
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sumPhi += phii;
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sumMagPhi += magPhii;
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CpfMean += Cpf[facei]*magPhii;
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primaryInletTfMean += Tf[facei]*magPhii;
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}
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@ -233,9 +264,9 @@ void Foam::fv::effectivenessHeatExchangerSource::addSup
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primaryInletT = primaryInletTfMean/(sumMagPhi + ROOTVSMALL);
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}
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const scalar alpha =
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eTable_()(mag(sumPhi), secondaryMassFlowRate_)
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*CpfMean*mag(sumPhi);
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const scalar effectiveness = eTable_()(mag(sumPhi), secondaryMassFlowRate_);
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const scalar alpha = effectiveness*CpfMean*mag(sumPhi);
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const scalar Qt = alpha*(secondaryInletT_ - primaryInletT);
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@ -245,7 +276,7 @@ void Foam::fv::effectivenessHeatExchangerSource::addSup
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&& (mesh_.time().timeIndex() % targetQdotCalcInterval_ == 0)
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)
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{
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scalar dT = (targetQdot_ - Qt)/(alpha + ROOTVSMALL);
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const scalar dT = (targetQdot_ - Qt)/(alpha + ROOTVSMALL);
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secondaryInletT_ += targetQdotRelax_*dT;
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}
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@ -257,7 +288,7 @@ void Foam::fv::effectivenessHeatExchangerSource::addSup
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Tref = gMax(TCells);
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forAll(deltaTCells, i)
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{
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deltaTCells[i] = max(Tref - TCells[i], 0.0);
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deltaTCells[i] = max(Tref - TCells[i], scalar(0));
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}
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}
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else
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@ -265,7 +296,7 @@ void Foam::fv::effectivenessHeatExchangerSource::addSup
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Tref = gMin(TCells);
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forAll(deltaTCells, i)
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{
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deltaTCells[i] = max(TCells[i] - Tref, 0.0);
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deltaTCells[i] = max(TCells[i] - Tref, scalar(0));
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}
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}
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@ -275,7 +306,7 @@ void Foam::fv::effectivenessHeatExchangerSource::addSup
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scalar sumWeight = 0;
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forAll(cells_, i)
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{
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label celli = cells_[i];
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const label celli = cells_[i];
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sumWeight += V[celli]*mag(U[celli])*deltaTCells[i];
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}
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reduce(sumWeight, sumOp<scalar>());
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@ -286,75 +317,104 @@ void Foam::fv::effectivenessHeatExchangerSource::addSup
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forAll(cells_, i)
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{
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label celli = cells_[i];
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const label celli = cells_[i];
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heSource[celli] -=
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Qt*V[celli]*mag(U[celli])*deltaTCells[i]
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/(sumWeight + ROOTVSMALL);
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}
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}
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Info<< type() << ": " << name() << nl << incrIndent
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<< indent << "Net mass flux [Kg/s] : " << sumPhi << nl
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<< indent << "Total heat exchange [W] : " << Qt << nl
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Log << nl
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<< type() << ": " << name() << nl << incrIndent
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<< indent << "Net mass flux [kg/s] : " << sumPhi << nl
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<< indent << "Total heat exchange [W] : " << Qt << nl
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<< indent << "Secondary inlet T [K] : " << secondaryInletT_ << nl
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<< indent << "Tref [K] : " << Tref << nl
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<< indent << "Effectiveness : "
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<< eTable_()(mag(sumPhi), secondaryMassFlowRate_) << decrIndent
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<< nl << endl;
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<< indent << "Effectiveness : " << effectiveness
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<< decrIndent;
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if (Pstream::master())
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{
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Ostream& os = file();
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writeCurrentTime(os);
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os << tab << sumPhi
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<< tab << Qt
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<< tab << secondaryInletT_
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<< tab << Tref
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<< tab << effectiveness;
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if (secondaryCpPtr_)
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{
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// Secondary Cp as a function of the starting secondary temperature
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const scalar secondaryCp = secondaryCpPtr_->value(secondaryInletT_);
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const scalar secondaryOutletT =
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Qt/(secondaryMassFlowRate_*secondaryCp) + secondaryInletT_;
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Log << nl << incrIndent << indent
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<< "Secondary outlet T [K] : " << secondaryOutletT
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<< decrIndent;
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os << tab << secondaryOutletT;
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}
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os << endl;
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}
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Info<< nl << endl;
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}
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bool Foam::fv::effectivenessHeatExchangerSource::read(const dictionary& dict)
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{
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if (fv::cellSetOption::read(dict))
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if (!(fv::cellSetOption::read(dict) && writeFile::read(dict)))
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{
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UName_ = coeffs_.getOrDefault<word>("U", "U");
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TName_ = coeffs_.getOrDefault<word>("T", "T");
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phiName_ = coeffs_.getOrDefault<word>("phi", "phi");
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coeffs_.readEntry("faceZone", faceZoneName_);
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coeffs_.readEntry("secondaryMassFlowRate", secondaryMassFlowRate_);
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coeffs_.readEntry("secondaryInletT", secondaryInletT_);
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if (coeffs_.readIfPresent("primaryInletT", primaryInletT_))
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{
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userPrimaryInletT_ = true;
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Info<< type() << " " << this->name() << ": " << indent << nl
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<< "employing user-specified primary flow inlet temperature: "
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<< primaryInletT_ << endl;
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}
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else
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{
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Info<< type() << " " << this->name() << ": " << indent << nl
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<< "employing flux-weighted primary flow inlet temperature"
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<< endl;
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}
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if (coeffs_.readIfPresent("targetQdot", targetQdot_))
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{
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targetQdotActive_ = true;
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Info<< indent << "employing target heat rejection of "
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<< targetQdot_ << nl;
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coeffs_.readIfPresent
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(
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"targetQdotCalcInterval",
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targetQdotCalcInterval_
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);
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Info<< indent << "updating secondary inlet temperature every "
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<< targetQdotCalcInterval_ << " iterations" << nl;
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coeffs_.readIfPresent("targetQdotRelax", targetQdotRelax_);
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Info<< indent << "temperature relaxation: "
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<< targetQdotRelax_ << endl;
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}
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return true;
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return false;
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}
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return false;
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coeffs_.readEntry("secondaryMassFlowRate", secondaryMassFlowRate_);
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coeffs_.readEntry("secondaryInletT", secondaryInletT_);
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if (coeffs_.readIfPresent("primaryInletT", primaryInletT_))
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{
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userPrimaryInletT_ = true;
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Info<< type() << " " << this->name() << ": " << indent << nl
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<< "employing user-specified primary flow inlet temperature: "
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<< primaryInletT_ << endl;
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}
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else
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{
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Info<< type() << " " << this->name() << ": " << indent << nl
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<< "employing flux-weighted primary flow inlet temperature"
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<< endl;
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}
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if (coeffs_.readIfPresent("targetQdot", targetQdot_))
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{
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targetQdotActive_ = true;
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Info<< indent << "employing target heat rejection of "
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<< targetQdot_ << nl;
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coeffs_.readIfPresent
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(
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"targetQdotCalcInterval",
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targetQdotCalcInterval_
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);
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Info<< indent << "updating secondary inlet temperature every "
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<< targetQdotCalcInterval_ << " iterations" << nl;
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coeffs_.readIfPresent("targetQdotRelax", targetQdotRelax_);
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Info<< indent << "temperature relaxation: "
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<< targetQdotRelax_ << endl;
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}
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UName_ = coeffs_.getOrDefault<word>("U", "U");
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TName_ = coeffs_.getOrDefault<word>("T", "T");
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phiName_ = coeffs_.getOrDefault<word>("phi", "phi");
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coeffs_.readEntry("faceZone", faceZoneName_);
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return true;
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}
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@ -6,7 +6,7 @@
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\\/ M anipulation |
|
||||
-------------------------------------------------------------------------------
|
||||
Copyright (C) 2013-2017 OpenFOAM Foundation
|
||||
Copyright (C) 2016-2020 OpenCFD Ltd.
|
||||
Copyright (C) 2016-2022 OpenCFD Ltd.
|
||||
-------------------------------------------------------------------------------
|
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License
|
||||
This file is part of OpenFOAM.
|
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@ -31,8 +31,8 @@ Group
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grpFvOptionsSources
|
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|
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Description
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Heat exchanger source model for compressible flows, in which the heat
|
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exchanger is defined as an energy source using a selection of cells.
|
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Heat exchanger source model for compressible flows, where the heat
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exchanger is modelled as an energy source using a selection of cells.
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The total heat exchange source is given by:
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\f[
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@ -41,13 +41,13 @@ Description
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|
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where:
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\vartable
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Q_t | total heat source
|
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e(\phi,\dot{m}_2) | effectivenes table
|
||||
\phi | net mass flux entering heat exchanger [kg/s]
|
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\dot{m}_2 | secondary mass flow rate [kg/s]
|
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T_1 | primary inlet temperature [K]
|
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T_2 | secondary inlet temperature [K]
|
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c_p | specific heat capacity [J/kg/K]
|
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Q_t | Total heat exchange source [J/s]
|
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e(\phi,\dot{m}_2) | Effectivenes table [-]
|
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\phi | Net mass flux entering heat exchanger [kg/s]
|
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\dot{m}_2 | Secondary flow mass flow rate [kg/s]
|
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T_1 | Primary flow inlet temperature [K]
|
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T_2 | Secondary flow inlet temperature [K]
|
||||
c_p | Primary flow specific heat capacity [J/kg/K]
|
||||
\endvartable
|
||||
|
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|
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@ -58,11 +58,11 @@ Description
|
||||
|
||||
where:
|
||||
\vartable
|
||||
Q_c | source for cell
|
||||
V_c | volume of the cell [m3]
|
||||
U_c | local cell velocity [m/s]
|
||||
T_c | local call temperature [K]
|
||||
T_{ref} | min or max(T) in cell zone depending on the sign of Q_t [K]
|
||||
Q_c | Source for cell
|
||||
V_c | Volume of the cell [m3]
|
||||
U_c | Local cell velocity [m/s]
|
||||
T_c | Local cell temperature [K]
|
||||
T_{ref} | Min or max(T) in cell zone depending on the sign of Qt [K]
|
||||
\endvartable
|
||||
|
||||
Sources applied to either of the below, if exist:
|
||||
@ -83,63 +83,69 @@ Usage
|
||||
\verbatim
|
||||
effectivenessHeatExchangerSource1
|
||||
{
|
||||
// Mandatory entries (unmodifiable)
|
||||
type effectivenessHeatExchangerSource;
|
||||
|
||||
// Mandatory entries (runtime modifiable)
|
||||
// Mandatory entries
|
||||
type effectivenessHeatExchangerSource;
|
||||
faceZone <faceZoneName>;
|
||||
secondaryMassFlowRate 1.0;
|
||||
secondaryInletT 336;
|
||||
|
||||
secondaryMassFlowRate <scalar>;
|
||||
secondaryInletT <scalar>;
|
||||
file "effectivenessTable";
|
||||
outOfBounds clamp;
|
||||
file "effTable";
|
||||
|
||||
// Optional entries (runtime modifiable)
|
||||
primaryInletT 293;
|
||||
targetQdot 1500;
|
||||
U <Uname>;
|
||||
T <Tname>;
|
||||
phi <phiName>;
|
||||
// Optional entries
|
||||
U <word>;
|
||||
T <word>;
|
||||
phi <word>;
|
||||
|
||||
// Conditional optional entries (runtime modifiable)
|
||||
// Conditional optional entries
|
||||
|
||||
// when the entry "targetQdot" is present
|
||||
targetQdotCalcInterval 1;
|
||||
targetQdotRelax 1.0;
|
||||
// when the total heat exchange is calculated with primary inlet T
|
||||
primaryInletT <scalar>;
|
||||
|
||||
// Mandatory/Optional (inherited) entries
|
||||
// when the total heat exchange is calculated with a given target
|
||||
targetQdot <scalar>;
|
||||
targetQdotCalcInterval <label>;
|
||||
targetQdotRelax <scalar>;
|
||||
|
||||
// when secondary outlet temperature is requested
|
||||
secondaryCp <Function1<scalar>>;
|
||||
|
||||
// Inherited entries
|
||||
...
|
||||
}
|
||||
\endverbatim
|
||||
|
||||
where the entries mean:
|
||||
\table
|
||||
Property | Description | Type | Reqd | Dflt
|
||||
Property | Description | Type | Reqd | Deflt
|
||||
type | Type name: effectivenessHeatExchangerSource <!--
|
||||
--> | word | yes | -
|
||||
secondaryMassFlowRate | Secondary flow mass rate [kg/s] <!--
|
||||
--> | scalar | yes | -
|
||||
secondaryInletT | Inlet secondary temperature [K] <!--
|
||||
secondaryInletT | Secondary flow inlet temperature [K] <!--
|
||||
--> | scalar | yes | -
|
||||
faceZone | Name of the faceZone at the heat exchange inlet <!--
|
||||
faceZone | Name of the faceZone at the heat exchanger inlet <!--
|
||||
--> | word | yes | -
|
||||
file | 2D look up table efficiency = function of primary <!--
|
||||
file | 2D effectiveness table = function of primary <!--
|
||||
--> and secondary mass flow rates [kg/s] | file | yes | -
|
||||
primaryInletT | Primary air temperature at the heat exchanger inlet <!--
|
||||
primaryInletT | Primary flow temperature at the heat exchanger inlet <!--
|
||||
--> | scalar | no | -
|
||||
targetQdot | Target heat rejection | scalar | no | -
|
||||
targetQdotCalcInterval | Target heat rejection calculation interval <!--
|
||||
--> | label | no | -
|
||||
targetQdotRelax | Target heat rejection temperature <!--
|
||||
--> under-relaxation coefficient | scalar | no | -
|
||||
U | Name of operand velocity field | word | no | U
|
||||
T | Name of operand temperature field | word | no | T
|
||||
phi | Name of operand flux field | word | no | phi
|
||||
secondaryCp | Secondary flow specific heat capacity <!--
|
||||
--> | Function1\<scalar\> | no | -
|
||||
U | Name of operand velocity field | word | no | U
|
||||
T | Name of operand temperature field | word | no | T
|
||||
phi | Name of operand flux field | word | no | phi
|
||||
\endtable
|
||||
|
||||
The inherited entries are elaborated in:
|
||||
- \link fvOption.H \endlink
|
||||
- \link cellSetOption.H \endlink
|
||||
- \link fvOption.H \endlink
|
||||
- \link cellSetOption.H \endlink
|
||||
- \link writeFile.H \endlink
|
||||
- \link Function1.H \endlink
|
||||
|
||||
The effectiveness table is described in terms of the primary and secondary
|
||||
mass flow rates. For example, the table:
|
||||
@ -185,13 +191,15 @@ Usage
|
||||
\endverbatim
|
||||
|
||||
Note
|
||||
- Primary flow indicates the CFD flow region and
|
||||
secondary flow the non-CFD-model region.
|
||||
- The table with name \c file should have the same units as the
|
||||
secondary mass flow rate and kg/s for \c phi.
|
||||
secondary mass flow rate and kg/s for \c phi.
|
||||
- \c faceZone is the faces at the inlet of the \c cellZone, it needs to be
|
||||
created with flip map flags. It is used to integrate the net mass flow
|
||||
rate into the heat exchanger.
|
||||
created with flip map flags. It is used to integrate the net mass flow
|
||||
rate into the heat exchanger.
|
||||
- \c primaryInletT sets the primary inlet temperature. If not set, the
|
||||
flux-averaged temperature is used.
|
||||
flux-averaged temperature is used.
|
||||
|
||||
SourceFiles
|
||||
effectivenessHeatExchangerSource.C
|
||||
@ -204,6 +212,8 @@ SourceFiles
|
||||
#include "cellSetOption.H"
|
||||
#include "autoPtr.H"
|
||||
#include "interpolation2DTable.H"
|
||||
#include "writeFile.H"
|
||||
#include "Function1.H"
|
||||
|
||||
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
||||
|
||||
@ -218,71 +228,71 @@ namespace fv
|
||||
|
||||
class effectivenessHeatExchangerSource
|
||||
:
|
||||
public fv::cellSetOption
|
||||
public fv::cellSetOption,
|
||||
public functionObjects::writeFile
|
||||
{
|
||||
protected:
|
||||
// Private Data
|
||||
|
||||
// Protected Data
|
||||
|
||||
//- Secondary flow mass rate [kg/s]
|
||||
scalar secondaryMassFlowRate_;
|
||||
|
||||
//- Inlet secondary temperature [K]
|
||||
scalar secondaryInletT_;
|
||||
|
||||
//- Primary air temperature at the heat exchanger inlet [K]
|
||||
scalar primaryInletT_;
|
||||
|
||||
//- Flag to use a user-specified primary inlet temperature
|
||||
//- Flag to use a user-specified primary flow inlet temperature
|
||||
bool userPrimaryInletT_;
|
||||
|
||||
//- Flag to use target heat rejection
|
||||
bool targetQdotActive_;
|
||||
|
||||
//- Target heat rejection
|
||||
scalar targetQdot_;
|
||||
//- Secondary flow specific heat capacity [J/kg/K]
|
||||
autoPtr<Function1<scalar>> secondaryCpPtr_;
|
||||
|
||||
//- 2D effectiveness table = function of primary and secondary
|
||||
//- mass flow rates [kg/s]
|
||||
autoPtr<interpolation2DTable<scalar>> eTable_;
|
||||
|
||||
//- Target heat rejection calculation interval
|
||||
label targetQdotCalcInterval_;
|
||||
|
||||
//- Secondary flow mass rate [kg/s]
|
||||
scalar secondaryMassFlowRate_;
|
||||
|
||||
//- Secondary flow inlet temperature [K]
|
||||
scalar secondaryInletT_;
|
||||
|
||||
//- Primary flow temperature at the heat exchanger inlet [K]
|
||||
scalar primaryInletT_;
|
||||
|
||||
//- Target heat rejection
|
||||
scalar targetQdot_;
|
||||
|
||||
//- Target heat rejection temperature under-relaxation coefficient
|
||||
scalar targetQdotRelax_;
|
||||
|
||||
//- 2D look up table efficiency = function of primary and secondary
|
||||
//- mass flow rates [kg/s]
|
||||
autoPtr<interpolation2DTable<scalar>> eTable_;
|
||||
|
||||
//- Name of velocity field; default = U
|
||||
//- Name of operand velocity field
|
||||
word UName_;
|
||||
|
||||
//- Name of temperature field; default = T
|
||||
//- Name of operand temperature field
|
||||
word TName_;
|
||||
|
||||
//- Name of the flux
|
||||
//- Name of operand flux field
|
||||
word phiName_;
|
||||
|
||||
//- Name of the faceZone at the heat exchange inlet
|
||||
//- Name of the faceZone at the heat exchanger inlet
|
||||
word faceZoneName_;
|
||||
|
||||
//- Local list of face IDs
|
||||
//- Local list of face IDs
|
||||
labelList faceId_;
|
||||
|
||||
//- Local list of patch ID per face
|
||||
//- Local list of patch IDs per face
|
||||
labelList facePatchId_;
|
||||
|
||||
//- List of +1/-1 representing face flip map (1 use as is, -1 negate)
|
||||
labelList faceSign_;
|
||||
|
||||
|
||||
private:
|
||||
|
||||
// Private Member Functions
|
||||
|
||||
//- Initialise heat exchanger source model
|
||||
void initialise();
|
||||
|
||||
//- Calculate total area of faceZone across processors
|
||||
void calculateTotalArea(scalar& area);
|
||||
//- Output file header information
|
||||
virtual void writeFileHeader(Ostream& os);
|
||||
|
||||
|
||||
public:
|
||||
@ -338,7 +348,7 @@ public:
|
||||
);
|
||||
|
||||
|
||||
// IO
|
||||
// I-O
|
||||
|
||||
//- Read dictionary
|
||||
virtual bool read(const dictionary& dict);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user