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ENH: Updates to surface film models

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This commit is contained in:
andy
2010-09-10 13:33:08 +01:00
parent 97ee7cfb20
commit f83bfb62e0
5 changed files with 90 additions and 93 deletions
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56
src/surfaceFilmModels/submodels/thermo/phaseChangeModel/standardPhaseChange/standardPhaseChange.C
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@ -74,6 +74,7 @@ Foam::surfaceFilmModels::standardPhaseChange::standardPhaseChange
) )
: :
phaseChangeModel(typeName, owner, dict), phaseChangeModel(typeName, owner, dict),
Tb_(readScalar(coeffs_.lookup("Tb"))),
deltaMin_(readScalar(coeffs_.lookup("deltaMin"))), deltaMin_(readScalar(coeffs_.lookup("deltaMin"))),
L_(readScalar(coeffs_.lookup("L"))) L_(readScalar(coeffs_.lookup("L")))
{} {}
@ -116,48 +117,63 @@ void Foam::surfaceFilmModels::standardPhaseChange::correct
const scalarField hInf = film.htcs().h(); const scalarField hInf = film.htcs().h();
const scalarField hFilm = film.htcw().h(); const scalarField hFilm = film.htcw().h();
const vectorField dU = film.UPrimary() - film.Us(); const vectorField dU = film.UPrimary() - film.Us();
const scalarField availableMass = delta*rho*magSf; const scalarField availableMass = (delta - deltaMin_)*rho*magSf;
// Reynolds number
const scalarField Re = rho*mag(dU)*L_/mu;
// molecular weight of vapour
const scalar Wvap = thermo.carrier().W(vapId);
// molecular weight of liquid
const scalar Wliq = liq.W();
forAll(dMass, cellI) forAll(dMass, cellI)
{ {
if (delta[cellI] > deltaMin_) if (delta[cellI] > deltaMin_)
{ {
// cell pressure // cell pressure [Pa]
const scalar pc = pInf[cellI]; const scalar pc = pInf[cellI];
// saturation pressure // local temperature - impose lower limit of 200 K for stability
const scalar pSat = liq.pv(pc, Ts[cellI]); const scalar Tloc = min(liq.Tc(), max(200.0, Ts[cellI]));
// latent heat // saturation pressure [Pa]
const scalar hVap = liq.hl(pc, Ts[cellI]); const scalar pSat = liq.pv(pc, Tloc);
// latent heat [J/kg]
const scalar hVap = liq.hl(pc, Tloc);
// calculate mass transfer // calculate mass transfer
if (pSat > pc) if (pSat >= pc)
{ {
// boiling // boiling
const scalar qDotInf = hInf[cellI]*(TInf[cellI] - T[cellI]); const scalar qDotInf = hInf[cellI]*(TInf[cellI] - T[cellI]);
const scalar qDotFilm = hFilm[cellI]*(T[cellI] - Tw[cellI]); const scalar qDotFilm = hFilm[cellI]*(T[cellI] - Tw[cellI]);
dMass[cellI] = dt*magSf[cellI]/hVap*(qDotInf - qDotFilm);
const scalar cp = liq.cp(pc, Tloc);
const scalar qCorr = availableMass[cellI]*cp*(T[cellI] - Tb_);
dMass[cellI] =
dt*magSf[cellI]/hVap*(qDotInf + qDotFilm)
+ qCorr/hVap;
} }
else else
{ {
// Reynolds number
const scalarField Re = rho*mag(dU)*L_/mu;
// molecular weight of vapour [kg/kmol]
const scalar Wvap = thermo.carrier().W(vapId);
// molecular weight of liquid [kg/kmol]
const scalar Wliq = liq.W();
// vapour mass fraction at interface // vapour mass fraction at interface
const scalar Ys = Wliq*pSat/(Wliq*pSat + Wvap*(pc - pSat)); const scalar Ys = Wliq*pSat/(Wliq*pSat + Wvap*(pc - pSat));
// bulk gas average density // bulk gas average density [kg/m3]
const scalar rhoAve = pc/(specie::RR*Ts[cellI]); scalar Winf = 0;
forAll(thermo.carrier().Y(), i)
{
Winf += film.YPrimary()[i][cellI]*thermo.carrier().W(i);
}
const scalar rhoInf = Winf*pc/(specie::RR*Tloc);
// vapour diffusivity [m2/s] // vapour diffusivity [m2/s]
const scalar Dab = liq.D(pc, Ts[cellI]); const scalar Dab = liq.D(pc, Tloc);
// Schmidt number // Schmidt number
const scalar Sc = mu[cellI]/(rho[cellI]*(Dab + ROOTVSMALL)); const scalar Sc = mu[cellI]/(rho[cellI]*(Dab + ROOTVSMALL));
@ -170,7 +186,7 @@ void Foam::surfaceFilmModels::standardPhaseChange::correct
// add mass contribution to source // add mass contribution to source
dMass[cellI] = dMass[cellI] =
dt*magSf[cellI]*rhoAve*hm*(Ys - YInf[cellI])/(1.0 - Ys); dt*magSf[cellI]*rhoInf*hm*(Ys - YInf[cellI])/(1.0 - Ys);
} }
dMass[cellI] = min(availableMass[cellI], max(0.0, dMass[cellI])); dMass[cellI] = min(availableMass[cellI], max(0.0, dMass[cellI]));

5
src/surfaceFilmModels/submodels/thermo/phaseChangeModel/standardPhaseChange/standardPhaseChange.H
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@ -67,10 +67,13 @@ protected:
// Protected data // Protected data
//- Boiling temperature / [K]
const scalar Tb_;
//- Minimum film height for model to be active //- Minimum film height for model to be active
const scalar deltaMin_; const scalar deltaMin_;
//- Length scalae / [m] //- Length scale / [m]
const scalar L_; const scalar L_;

18
src/surfaceFilmModels/surfaceFilmModel/kinematicSingleLayer/kinematicSingleLayer.C
View File

@ -222,6 +222,10 @@ transferPrimaryRegionFields()
rhoSp_.field() /= magSf_*deltaT; rhoSp_.field() /= magSf_*deltaT;
USp_.field() /= magSf_*deltaT; USp_.field() /= magSf_*deltaT;
pSp_.field() /= magSf_*deltaT; pSp_.field() /= magSf_*deltaT;
// reset transfer to primary fields
massForPrimary_ == dimensionedScalar("zero", dimMass, 0.0);
diametersForPrimary_ == dimensionedScalar("zero", dimLength, -1.0);
} }
@ -271,9 +275,6 @@ Foam::surfaceFilmModels::kinematicSingleLayer::pp()
void Foam::surfaceFilmModels::kinematicSingleLayer::correctDetachedFilm() void Foam::surfaceFilmModels::kinematicSingleLayer::correctDetachedFilm()
{ {
massForPrimary_ == dimensionedScalar("zero", dimMass, 0.0);
diametersForPrimary_ == dimensionedScalar("zero", dimLength, -1.0);
const scalarField gNorm = this->gNorm(); const scalarField gNorm = this->gNorm();
forAll(gNorm, i) forAll(gNorm, i)
@ -308,8 +309,7 @@ void Foam::surfaceFilmModels::kinematicSingleLayer::updateSubmodels()
// Update source fields // Update source fields
const dimensionedScalar deltaT = time_.deltaT(); const dimensionedScalar deltaT = time_.deltaT();
rhoSp_ -= massForPrimary_/magSf_/deltaT; rhoSp_ -= (massForPrimary_ + massPhaseChangeForPrimary_)/magSf_/deltaT;
USp_ -= massForPrimary_*U_/magSf_/deltaT;
} }
@ -457,6 +457,12 @@ Foam::surfaceFilmModels::kinematicSingleLayer::solveMomentum
USp_ USp_
+ tau(U_) + tau(U_)
+ fvc::grad(sigma_) + fvc::grad(sigma_)
- fvm::Sp
(
(massForPrimary_ + massPhaseChangeForPrimary_)
/magSf_/time_.deltaT(),
U_
)
); );
fvVectorMatrix& UEqn = tUEqn(); fvVectorMatrix& UEqn = tUEqn();
@ -1239,7 +1245,7 @@ Foam::surfaceFilmModels::kinematicSingleLayer::Srho() const
const label filmPatchI = filmBottomPatchIDs_[i]; const label filmPatchI = filmBottomPatchIDs_[i];
scalarField patchMass = scalarField patchMass =
massPhaseChangeForPrimary().boundaryField()[filmPatchI]; massPhaseChangeForPrimary_.boundaryField()[filmPatchI];
distMap.distribute(patchMass); distMap.distribute(patchMass);

68
src/surfaceFilmModels/surfaceFilmModel/noFilm/noFilm.C
View File

@ -138,10 +138,8 @@ void Foam::surfaceFilmModels::noFilm::addSources
const Foam::volVectorField& Foam::surfaceFilmModels::noFilm::U() const const Foam::volVectorField& Foam::surfaceFilmModels::noFilm::U() const
{ {
FatalErrorIn FatalErrorIn("const volScalarField& noFilm::U() const")
( << "U field not available for " << type() << abort(FatalError);
"const volScalarField& noFilm::U() const"
) << "U field not available for " << type() << abort(FatalError);
return volVectorField::null(); return volVectorField::null();
} }
@ -149,10 +147,8 @@ const Foam::volVectorField& Foam::surfaceFilmModels::noFilm::U() const
const Foam::volVectorField& Foam::surfaceFilmModels::noFilm::Us() const const Foam::volVectorField& Foam::surfaceFilmModels::noFilm::Us() const
{ {
FatalErrorIn FatalErrorIn("const volScalarField& noFilm::Us() const")
( << "Us field not available for " << type() << abort(FatalError);
"const volScalarField& noFilm::Us() const"
) << "Us field not available for " << type() << abort(FatalError);
return volVectorField::null(); return volVectorField::null();
} }
@ -160,10 +156,8 @@ const Foam::volVectorField& Foam::surfaceFilmModels::noFilm::Us() const
const Foam::volVectorField& Foam::surfaceFilmModels::noFilm::Uw() const const Foam::volVectorField& Foam::surfaceFilmModels::noFilm::Uw() const
{ {
FatalErrorIn FatalErrorIn("const volScalarField& noFilm::Uw() const")
( << "Uw field not available for " << type() << abort(FatalError);
"const volScalarField& noFilm::Uw() const"
) << "Uw field not available for " << type() << abort(FatalError);
return volVectorField::null(); return volVectorField::null();
} }
@ -171,10 +165,8 @@ const Foam::volVectorField& Foam::surfaceFilmModels::noFilm::Uw() const
const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::rho() const const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::rho() const
{ {
FatalErrorIn FatalErrorIn("const volScalarField& noFilm::rho() const")
( << "rho field not available for " << type() << abort(FatalError);
"const volScalarField& noFilm::rho() const"
) << "rho field not available for " << type() << abort(FatalError);
return volScalarField::null(); return volScalarField::null();
} }
@ -182,10 +174,8 @@ const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::rho() const
const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::T() const const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::T() const
{ {
FatalErrorIn FatalErrorIn("const Foam::volScalarField& Foam::noFilm::T() const")
( << "T field not available for " << type() << abort(FatalError);
"const Foam::volScalarField& Foam::noFilm::T() const"
) << "T field not available for " << type() << abort(FatalError);
return volScalarField::null(); return volScalarField::null();
} }
@ -193,10 +183,8 @@ const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::T() const
const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::Ts() const const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::Ts() const
{ {
FatalErrorIn FatalErrorIn("const Foam::volScalarField& Foam::noFilm::Ts() const")
( << "Ts field not available for " << type() << abort(FatalError);
"const Foam::volScalarField& Foam::noFilm::Ts() const"
) << "Ts field not available for " << type() << abort(FatalError);
return volScalarField::null(); return volScalarField::null();
} }
@ -204,10 +192,8 @@ const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::Ts() const
const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::Tw() const const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::Tw() const
{ {
FatalErrorIn FatalErrorIn("const Foam::volScalarField& Foam::noFilm::Tw() const")
( << "Tw field not available for " << type() << abort(FatalError);
"const Foam::volScalarField& Foam::noFilm::Tw() const"
) << "Tw field not available for " << type() << abort(FatalError);
return volScalarField::null(); return volScalarField::null();
} }
@ -215,10 +201,8 @@ const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::Tw() const
const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::cp() const const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::cp() const
{ {
FatalErrorIn FatalErrorIn("const volScalarField& noFilm::cp() const")
( << "cp field not available for " << type() << abort(FatalError);
"const volScalarField& noFilm::cp() const"
) << "cp field not available for " << type() << abort(FatalError);
return volScalarField::null(); return volScalarField::null();
} }
@ -226,10 +210,8 @@ const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::cp() const
const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::kappa() const const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::kappa() const
{ {
FatalErrorIn FatalErrorIn("const volScalarField& noFilm::kappa() const")
( << "kappa field not available for " << type() << abort(FatalError);
"const volScalarField& noFilm::kappa() const"
) << "kappa field not available for " << type() << abort(FatalError);
return volScalarField::null(); return volScalarField::null();
} }
@ -238,10 +220,8 @@ const Foam::volScalarField& Foam::surfaceFilmModels::noFilm::kappa() const
const Foam::volScalarField& const Foam::volScalarField&
Foam::surfaceFilmModels::noFilm::massForPrimary() const Foam::surfaceFilmModels::noFilm::massForPrimary() const
{ {
FatalErrorIn FatalErrorIn("const volScalarField& noFilm::massForPrimary() const")
( << "massForPrimary field not available for " << type()
"const volScalarField& noFilm::massForPrimary() const"
) << "massForPrimary field not available for " << type()
<< abort(FatalError); << abort(FatalError);
return volScalarField::null(); return volScalarField::null();
@ -251,10 +231,8 @@ Foam::surfaceFilmModels::noFilm::massForPrimary() const
const Foam::volScalarField& const Foam::volScalarField&
Foam::surfaceFilmModels::noFilm::diametersForPrimary() const Foam::surfaceFilmModels::noFilm::diametersForPrimary() const
{ {
FatalErrorIn FatalErrorIn("const volScalarField& noFilm::diametersForPrimary() const")
( << "diametersForPrimary field not available for " << type()
"const volScalarField& noFilm::diametersForPrimary() const"
) << "diametersForPrimary field not available for " << type()
<< abort(FatalError); << abort(FatalError);
return volScalarField::null(); return volScalarField::null();
@ -267,7 +245,7 @@ Foam::surfaceFilmModels::noFilm::massPhaseChangeForPrimary() const
FatalErrorIn FatalErrorIn
( (
"const volScalarField& noFilm::massPhaseChangeForPrimary() const" "const volScalarField& noFilm::massPhaseChangeForPrimary() const"
) << "massPhaseChangeForPrimary field not available for " << type() ) << "massPhaseChange field not available for " << type()
<< abort(FatalError); << abort(FatalError);
return volScalarField::null(); return volScalarField::null();

32
src/surfaceFilmModels/surfaceFilmModel/thermoSingleLayer/thermoSingleLayer.C
View File

@ -175,8 +175,8 @@ void Foam::surfaceFilmModels::thermoSingleLayer::updateSubmodels()
htcw_->correct(); htcw_->correct();
// Update phase change // Update phase change
massPhaseChangeForPrimary_ == dimensionedScalar("zero", dimMass, 0.0); massPhaseChangeForPrimary_.internalField() = 0.0;
energyPhaseChangeForPrimary_ == dimensionedScalar("zero", dimEnergy, 0.0); energyPhaseChangeForPrimary_.internalField() = 0.0;
phaseChange_->correct phaseChange_->correct
( (
@ -191,11 +191,7 @@ void Foam::surfaceFilmModels::thermoSingleLayer::updateSubmodels()
kinematicSingleLayer::updateSubmodels(); kinematicSingleLayer::updateSubmodels();
// Update source fields // Update source fields
const dimensionedScalar deltaT = time_.deltaT(); hsSp_ -= energyPhaseChangeForPrimary_/magSf_/time_.deltaT();
rhoSp_ -= massPhaseChangeForPrimary_/magSf_/deltaT;
USp_ -= massPhaseChangeForPrimary_*U_/magSf_/deltaT;
hsSp_ -=
(massForPrimary_*hs_ + energyPhaseChangeForPrimary_)/magSf_/deltaT;
} }
@ -208,7 +204,7 @@ Foam::tmp<Foam::fvScalarMatrix> Foam::surfaceFilmModels::thermoSingleLayer::q
return return
( (
- fvm::Sp(htcs_->h()/cp_, hs) - htcs_->h()*(Tstd - Ts_) - fvm::Sp(htcs_->h()/cp_, hs) - htcs_->h()*(Tstd - TPrimary_)
- fvm::Sp(htcw_->h()/cp_, hs) - htcw_->h()*(Tstd - Tw_) - fvm::Sp(htcw_->h()/cp_, hs) - htcw_->h()*(Tstd - Tw_)
); );
} }
@ -228,8 +224,9 @@ void Foam::surfaceFilmModels::thermoSingleLayer::solveEnergy()
fvm::ddt(deltaRho_, hs_) fvm::ddt(deltaRho_, hs_)
+ fvm::div(phi_, hs_) + fvm::div(phi_, hs_)
== ==
hsSp_ fvm::Sp(hsSp_/hs_, hs_)
+ q(hs_) + q(hs_)
- fvm::Sp(massForPrimary_/magSf_/time_.deltaT(), hs_)
); );
correctThermoFields(); correctThermoFields();
@ -635,7 +632,7 @@ Foam::surfaceFilmModels::thermoSingleLayer::Srho(const label i) const
const label filmPatchI = filmBottomPatchIDs_[i]; const label filmPatchI = filmBottomPatchIDs_[i];
scalarField patchMass = scalarField patchMass =
massPhaseChangeForPrimary().boundaryField()[filmPatchI]; massPhaseChangeForPrimary_.boundaryField()[filmPatchI];
distMap.distribute(patchMass); distMap.distribute(patchMass);
@ -672,7 +669,7 @@ Foam::surfaceFilmModels::thermoSingleLayer::Sh() const
dimensionedScalar("zero", dimEnergy/dimVolume/dimTime, 0.0) dimensionedScalar("zero", dimEnergy/dimVolume/dimTime, 0.0)
) )
); );
/*
scalarField& Sh = tSh(); scalarField& Sh = tSh();
const scalarField& V = mesh_.V(); const scalarField& V = mesh_.V();
const scalar dt = time_.deltaTValue(); const scalar dt = time_.deltaTValue();
@ -690,21 +687,18 @@ Foam::surfaceFilmModels::thermoSingleLayer::Sh() const
const label filmPatchI = filmBottomPatchIDs_[i]; const label filmPatchI = filmBottomPatchIDs_[i];
scalarField patchMass = scalarField patchEnergy =
massPhaseChangeForPrimary().boundaryField()[filmPatchI]; energyPhaseChangeForPrimary_.boundaryField()[filmPatchI];
distMap.distribute(patchMass); distMap.distribute(patchEnergy);
scalarField patchEnthalpy = hs_.boundaryField()[filmPatchI];
distMap.distribute(patchEnthalpy);
const unallocLabelList& cells = wpp.faceCells(); const unallocLabelList& cells = wpp.faceCells();
forAll(patchMass, j) forAll(patchMass, j)
{ {
Sh[cells[j]] += patchMass[j]*patchEnthalpy[j]/(V[cells[j]]*dt); Sh[cells[j]] += patchEnergy[j]/(V[cells[j]]*dt);
} }
} }
*/
return tSh; return tSh;
} }