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ENH: Adding thermal inertia to coupled BC.

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This helps on bounding Twall on cases where large inertia is found in the first cell
next to the fluid (i.e large cell, rho or Cp)
This commit is contained in:
sergio
2017-03-06 09:43:10 -08:00
parent 4401c0ee87
commit cb38533096
2 changed files with 82 additions and 6 deletions
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81
src/TurbulenceModels/compressible/turbulentFluidThermoModels/derivedFvPatchFields/turbulentTemperatureRadCoupledMixed/turbulentTemperatureRadCoupledMixedFvPatchScalarField.C
View File

@ -3,7 +3,7 @@
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2011-2016 OpenFOAM Foundation
\\/ M anipulation |
\\/ M anipulation | Copyright (C) 2017 OpenCFD Ltd
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
@ -28,6 +28,7 @@ License
#include "fvPatchFieldMapper.H"
#include "volFields.H"
#include "mappedPatchBase.H"
#include "basicThermo.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
@ -52,7 +53,8 @@ turbulentTemperatureRadCoupledMixedFvPatchScalarField
QrName_("undefined-Qr"),
thicknessLayers_(0),
kappaLayers_(0),
contactRes_(0)
contactRes_(0),
thermalInertia_(false)
{
this->refValue() = 0.0;
this->refGrad() = 0.0;
@ -76,7 +78,8 @@ turbulentTemperatureRadCoupledMixedFvPatchScalarField
QrName_(psf.QrName_),
thicknessLayers_(psf.thicknessLayers_),
kappaLayers_(psf.kappaLayers_),
contactRes_(psf.contactRes_)
contactRes_(psf.contactRes_),
thermalInertia_(psf.thermalInertia_)
{}
@ -95,7 +98,8 @@ turbulentTemperatureRadCoupledMixedFvPatchScalarField
QrName_(dict.lookupOrDefault<word>("Qr", "none")),
thicknessLayers_(0),
kappaLayers_(0),
contactRes_(0.0)
contactRes_(0.0),
thermalInertia_(dict.lookupOrDefault<bool>("thermalInertia", false))
{
if (!isA<mappedPatchBase>(this->patch().patch()))
{
@ -156,7 +160,8 @@ turbulentTemperatureRadCoupledMixedFvPatchScalarField
QrName_(psf.QrName_),
thicknessLayers_(psf.thicknessLayers_),
kappaLayers_(psf.kappaLayers_),
contactRes_(psf.contactRes_)
contactRes_(psf.contactRes_),
thermalInertia_(psf.thermalInertia_)
{}
@ -169,6 +174,8 @@ void turbulentTemperatureRadCoupledMixedFvPatchScalarField::updateCoeffs()
return;
}
const polyMesh& mesh = patch().boundaryMesh().mesh();
// Since we're inside initEvaluate/evaluate there might be processor
// comms underway. Change the tag we use.
int oldTag = UPstream::msgType();
@ -225,9 +232,70 @@ void turbulentTemperatureRadCoupledMixedFvPatchScalarField::updateCoeffs()
mpp.distribute(QrNbr);
}
// inertia therm
scalarField mCpDtNbr(Tp.size(), 0.0);
scalarField mCpDt(Tp.size(), 0.0);
if (thermalInertia_)
{
const scalar dt = mesh.time().deltaTValue();
if
(
nbrMesh.foundObject<basicThermo>(basicThermo::dictName)
)
{
const basicThermo& thermo =
nbrMesh.lookupObject<basicThermo>(basicThermo::dictName);
const scalarField Cpp =
thermo.Cp()().boundaryField()[nbrPatch.index()];
const scalarField rhop =
thermo.rho()().boundaryField()[nbrPatch.index()];
mCpDtNbr = Cpp*rhop/nbrPatch.deltaCoeffs()/dt;
mpp.distribute(mCpDtNbr);
}
// Local inertia therm
if
(
mesh.foundObject<basicThermo>(basicThermo::dictName)
)
{
const basicThermo& thermo =
mesh.lookupObject<basicThermo>(basicThermo::dictName);
const scalarField Cpp =
thermo.Cp()().boundaryField()[patch().index()];
const scalarField rhop =
thermo.rho()().boundaryField()[patch().index()];
mCpDt = Cpp*rhop/patch().deltaCoeffs()/dt;
}
}
const volScalarField& T =
this->db().lookupObject<volScalarField>
(
this->internalField().name()
);
const fvPatchField<scalar>& TpOld =
T.oldTime().boundaryField()[patch().index()];
scalarField alpha(KDeltaNbr + mCpDt + mCpDtNbr);
valueFraction() = alpha/(alpha + KDelta);
scalarField c(KDeltaNbr*TcNbr + (mCpDt + mCpDtNbr)*TpOld);
refValue() = c/alpha;
refGrad() = (Qr + QrNbr)/kappa(Tp);
/*
valueFraction() = KDeltaNbr/(KDeltaNbr + KDelta);
refValue() = TcNbr;
refGrad() = (Qr + QrNbr)/kappa(Tp);
*/
mixedFvPatchScalarField::updateCoeffs();
@ -263,6 +331,9 @@ void turbulentTemperatureRadCoupledMixedFvPatchScalarField::write
os.writeKeyword("Tnbr")<< TnbrName_ << token::END_STATEMENT << nl;
os.writeKeyword("QrNbr")<< QrNbrName_ << token::END_STATEMENT << nl;
os.writeKeyword("Qr")<< QrName_ << token::END_STATEMENT << nl;
os.writeKeyword("thermalInertia")
<< thermalInertia_ << token::END_STATEMENT << nl;
thicknessLayers_.writeEntry("thicknessLayers", os);
kappaLayers_.writeEntry("kappaLayers", os);

7
src/TurbulenceModels/compressible/turbulentFluidThermoModels/derivedFvPatchFields/turbulentTemperatureRadCoupledMixed/turbulentTemperatureRadCoupledMixedFvPatchScalarField.H
View File

@ -3,7 +3,7 @@
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2011-2016 OpenFOAM Foundation
\\/ M anipulation |
\\/ M anipulation | Copyright (C) 2017 OpenCFD Ltd
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
@ -44,6 +44,7 @@ Usage
kappaLayers | list of thermal conductivites per layer [W/m/K] | no |
kappaMethod | inherited from temperatureCoupledBase | inherited |
kappa | inherited from temperatureCoupledBase | inherited |
thermalInertia | Add thermal inertia to wall node | no | false
\endtable
Example of the boundary condition specification:
@ -56,6 +57,7 @@ Usage
Qr Qr; // or none. Name of Qr field on local region
thicknessLayers (0.1 0.2 0.3 0.4);
kappaLayers (1 2 3 4);
thermalInertia false/true;
kappaMethod lookup;
kappa kappa;
value uniform 300;
@ -115,6 +117,9 @@ class turbulentTemperatureRadCoupledMixedFvPatchScalarField
//- Total contact resistance
scalar contactRes_;
//- Thermal inertia term
bool thermalInertia_;
public: