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andy
2009-05-18 17:01:58 +01:00
parent 04b673aada
commit c7d2bbec32
4 changed files with 31 additions and 39 deletions
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8
src/lagrangian/coalCombustion/submodels/surfaceReactionModel/COxidationDiffusionLimitedRate/COxidationDiffusionLimitedRate.C
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@ -59,10 +59,10 @@ Foam::COxidationDiffusionLimitedRate::COxidationDiffusionLimitedRate
CsLocalId_ = owner.composition().localId(idSolid, "C"); CsLocalId_ = owner.composition().localId(idSolid, "C");
// Set local copies of thermo properties // Set local copies of thermo properties
WO2_ = owner().composition().gases()[O2GlobalId_].W(); WO2_ = owner().composition().carrierSpecies()[O2GlobalId_].W();
scalar WCO2 = owner().composition().gases()[CO2GlobalId_].W(); scalar WCO2 = owner().composition().carrierSpecies()[CO2GlobalId_].W();
WC_ = WCO2 - WO2_; WC_ = WCO2 - WO2_;
HcCO2_ = owner().composition().gases()[CO2GlobalId_].Hc(); HcCO2_ = owner().composition().carrierSpecies()[CO2GlobalId_].Hc();
if (Sb_ < 0) if (Sb_ < 0)
{ {
@ -138,7 +138,7 @@ Foam::scalar Foam::COxidationDiffusionLimitedRate::calculate
const scalar dmO2 = dmC/WC_*Sb_*WO2_; const scalar dmO2 = dmC/WC_*Sb_*WO2_;
// Mass of newly created CO2 [kg] // Mass of newly created CO2 [kg]
const scalar dmCO2 = dmC + dmO2; const scalar dmCO2 = dmC + dmO2;
// Update local particle C mass // Update local particle C mass
dMassSolid[CsLocalId_] += dmC; dMassSolid[CsLocalId_] += dmC;

8
src/lagrangian/coalCombustion/submodels/surfaceReactionModel/COxidationKineticDiffusionLimitedRate/COxidationKineticDiffusionLimitedRate.C
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@ -62,10 +62,10 @@ COxidationKineticDiffusionLimitedRate
CsLocalId_ = owner.composition().localId(idSolid, "C"); CsLocalId_ = owner.composition().localId(idSolid, "C");
// Set local copies of thermo properties // Set local copies of thermo properties
WO2_ = owner().composition().gases()[O2GlobalId_].W(); WO2_ = owner().composition().carrierSpecies()[O2GlobalId_].W();
scalar WCO2 = owner().composition().gases()[CO2GlobalId_].W(); scalar WCO2 = owner().composition().carrierSpecies()[CO2GlobalId_].W();
WC_ = WCO2 - WO2_; WC_ = WCO2 - WO2_;
HcCO2_ = owner().composition().gases()[CO2GlobalId_].Hc(); HcCO2_ = owner().composition().carrierSpecies()[CO2GlobalId_].Hc();
if (Sb_ < 0) if (Sb_ < 0)
{ {
@ -150,7 +150,7 @@ Foam::scalar Foam::COxidationKineticDiffusionLimitedRate::calculate
const scalar dmO2 = dmC/WC_*Sb_*WO2_; const scalar dmO2 = dmC/WC_*Sb_*WO2_;
// Mass of newly created CO2 [kg] // Mass of newly created CO2 [kg]
const scalar dmCO2 = dmC + dmO2; const scalar dmCO2 = dmC + dmO2;
// Update local particle C mass // Update local particle C mass
dMassSolid[CsLocalId_] += dmC; dMassSolid[CsLocalId_] += dmC;

50
src/lagrangian/coalCombustion/submodels/surfaceReactionModel/COxidationMurphyShaddix/COxidationMurphyShaddix.C
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@ -47,17 +47,16 @@ Foam::COxidationMurphyShaddix::COxidationMurphyShaddix
owner, owner,
typeName typeName
), ),
coeffDict_(dict.subDict(typeName + "Coeffs")), D0_(dimensionedScalar(this->coeffDict().lookup("D0")).value()),
D0_(dimensionedScalar(coeffDict_.lookup("D0")).value()), rho0_(dimensionedScalar(this->coeffDict().lookup("rho0")).value()),
rho0_(dimensionedScalar(coeffDict_.lookup("rho0")).value()), T0_(dimensionedScalar(this->coeffDict().lookup("T0")).value()),
T0_(dimensionedScalar(coeffDict_.lookup("T0")).value()), Dn_(dimensionedScalar(this->coeffDict().lookup("Dn")).value()),
Dn_(dimensionedScalar(coeffDict_.lookup("Dn")).value()), A_(dimensionedScalar(this->coeffDict().lookup("A")).value()),
A_(dimensionedScalar(coeffDict_.lookup("A")).value()), E_(dimensionedScalar(this->coeffDict().lookup("E")).value()),
E_(dimensionedScalar(coeffDict_.lookup("E")).value()), n_(dimensionedScalar(this->coeffDict().lookup("n")).value()),
n_(dimensionedScalar(coeffDict_.lookup("n")).value()), WVol_(dimensionedScalar(this->coeffDict().lookup("WVol")).value()),
WVol_(dimensionedScalar(coeffDict_.lookup("WVol")).value()), dH0_(dimensionedScalar(this->coeffDict().lookup("dH0")).value()),
dH0_(dimensionedScalar(coeffDict_.lookup("dH0")).value()), TMaxdH_(dimensionedScalar(this->coeffDict().lookup("TmaxdH")).value()),
TMaxdH_(dimensionedScalar(coeffDict_.lookup("TmaxdH")).value()),
CsLocalId_(-1), CsLocalId_(-1),
O2GlobalId_(-1), O2GlobalId_(-1),
CO2GlobalId_(-1) CO2GlobalId_(-1)
@ -138,16 +137,17 @@ Foam::scalar Foam::COxidationMurphyShaddix::calculate
const scalar D = D0_*(rho0_/rhoc)*pow(Tc/T0_, Dn_); const scalar D = D0_*(rho0_/rhoc)*pow(Tc/T0_, Dn_);
// Molecular weight of O2 [kg/kmol] // Molecular weight of O2 [kg/kmol]
const scalar WO2 = owner().composition().gases()[O2GlobalId_].W(); const scalar WO2 = owner().composition().carrierSpecies()[O2GlobalId_].W();
// Molecular weight of CO2 [kg/kmol] // Molecular weight of CO2 [kg/kmol]
const scalar WCO2 = owner().composition().gases()[CO2GlobalId_].W(); const scalar WCO2 =
owner().composition().carrierSpecies()[CO2GlobalId_].W();
// Molecular weight of C [kg/kmol] // Molecular weight of C [kg/kmol]
const scalar WC = WCO2 - WO2; const scalar WC = WCO2 - WO2;
// Far field partial pressure O2 [Pa] // Far field partial pressure O2 [Pa]
const scalar PO2 = rhoO2/WO2*specie::RR*Tc; const scalar ppO2 = rhoO2/WO2*specie::RR*Tc;
// Molar emission rate of volatiles per unit surface area // Molar emission rate of volatiles per unit surface area
const scalar qVol = sum(dMassVolatile)/(WVol_*Ap); const scalar qVol = sum(dMassVolatile)/(WVol_*Ap);
@ -157,23 +157,19 @@ Foam::scalar Foam::COxidationMurphyShaddix::calculate
if (debug) if (debug)
{ {
Pout << " C = " << C << endl; Pout<< "mass = " << mass << nl
<< "fComb = " << fComb << nl
<< "WC = " << WC << nl
<< "Ap = " << Ap << nl
<< "dt = " << dt << nl
<< "C = " << C << nl
<< endl;
} }
// Molar reaction rate per unit surface area [kmol/(m^2.s)] // Molar reaction rate per unit surface area [kmol/(m^2.s)]
scalar qCsOld = 0; scalar qCsOld = 0;
scalar qCs = 1; scalar qCs = 1;
if (debug)
{
Pout<< "mass = " << mass << nl
<< "fComb = " << fComb << nl
<< "WC = " << WC << nl
<< "Ap = " << Ap << nl
<< "dt = " << dt
<< nl << endl;
}
const scalar qCsLim = mass*fComb/(WC*Ap*dt); const scalar qCsLim = mass*fComb/(WC*Ap*dt);
if (debug) if (debug)
@ -182,10 +178,10 @@ Foam::scalar Foam::COxidationMurphyShaddix::calculate
} }
label iter = 0; label iter = 0;
while ((fabs(qCs - qCsOld)/qCs>tolerance_) && (iter<=maxIters_)) while ((mag(qCs - qCsOld)/qCs > tolerance_) && (iter <= maxIters_))
{ {
qCsOld = qCs; qCsOld = qCs;
const scalar PO2Surface = PO2*exp(-(qCs + qVol)*d/(2*C*D)); const scalar PO2Surface = ppO2*exp(-(qCs + qVol)*d/(2*C*D));
qCs = A_*exp(-E_/(specie::RR*T))*pow(PO2Surface, n_); qCs = A_*exp(-E_/(specie::RR*T))*pow(PO2Surface, n_);
qCs = (100.0*qCs + iter*qCsOld)/(100.0 + iter); qCs = (100.0*qCs + iter*qCsOld)/(100.0 + iter);
qCs = min(qCs, qCsLim); qCs = min(qCs, qCsLim);

4
src/lagrangian/coalCombustion/submodels/surfaceReactionModel/COxidationMurphyShaddix/COxidationMurphyShaddix.H
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@ -51,10 +51,6 @@ class COxidationMurphyShaddix
{ {
// Private data // Private data
//- Coefficients dictionary
const dictionary& coeffDict_;
// Model constants // Model constants
//- Reference diffusion constant //- Reference diffusion constant