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mixtureKEpsilon: Changed bounded non-conservative transport flux to be volumetric rather than mass-based

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Avoids numerical problems caused by large density gradients, particularly around the interface.
Allows the use of higher-order differencing for km and epsilonm
This commit is contained in:
Henry
2015-03-20 17:16:05 +00:00
parent b6e803ab8b
commit bcb8b30cad
1 changed files with 16 additions and 16 deletions
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32
src/TurbulenceModels/phaseCompressible/RAS/mixtureKEpsilon/mixtureKEpsilon.C
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@ -472,8 +472,8 @@ tmp<surfaceScalarField> mixtureKEpsilon<BasicTurbulenceModel>::mixFlux
surfaceScalarField rhogEfff(fvc::interpolate(rhogEff())); surfaceScalarField rhogEfff(fvc::interpolate(rhogEff()));
return return
fvc::interpolate(rhom_()/(alphal*rholEff() + alphag*rhogEff()*Ct2_())) (alphalf*rholEfff*fc + alphagf*rhogEfff*fvc::interpolate(Ct2_())*fd)
*(alphalf*rholEfff*fc + alphagf*rhogEfff*fvc::interpolate(Ct2_())*fd); /(alphalf*rholEfff + alphagf*rhogEfff*fvc::interpolate(Ct2_()));
} }
@ -516,14 +516,14 @@ tmp<volScalarField> mixtureKEpsilon<BasicTurbulenceModel>::bubbleG() const
template<class BasicTurbulenceModel> template<class BasicTurbulenceModel>
tmp<fvScalarMatrix> mixtureKEpsilon<BasicTurbulenceModel>::kSource() const tmp<fvScalarMatrix> mixtureKEpsilon<BasicTurbulenceModel>::kSource() const
{ {
return fvm::Su(bubbleG(), km_()); return fvm::Su(bubbleG()/rhom_(), km_());
} }
template<class BasicTurbulenceModel> template<class BasicTurbulenceModel>
tmp<fvScalarMatrix> mixtureKEpsilon<BasicTurbulenceModel>::epsilonSource() const tmp<fvScalarMatrix> mixtureKEpsilon<BasicTurbulenceModel>::epsilonSource() const
{ {
return fvm::Su(C3_*epsilonm_()*bubbleG()/km_(), epsilonm_()); return fvm::Su(C3_*epsilonm_()*bubbleG()/(rhom_()*km_()), epsilonm_());
} }
@ -647,14 +647,14 @@ void mixtureKEpsilon<BasicTurbulenceModel>::correct()
// Dissipation equation // Dissipation equation
tmp<fvScalarMatrix> epsEqn tmp<fvScalarMatrix> epsEqn
( (
fvm::ddt(rhom, epsilonm) fvm::ddt(epsilonm)
+ fvm::div(phim, epsilonm) + fvm::div(phim, epsilonm)
- fvm::Sp(fvc::ddt(rhom) + fvc::div(phim), epsilonm) - fvm::Sp(fvc::div(phim), epsilonm)
- fvm::laplacian(DepsilonEff(rhom*nutm), epsilonm) - fvm::laplacian(DepsilonEff(nutm), epsilonm)
== ==
C1_*rhom*Gm*epsilonm/km C1_*Gm*epsilonm/km
- fvm::SuSp(((2.0/3.0)*C1_)*rhom*divUm, epsilonm) - fvm::SuSp(((2.0/3.0)*C1_)*divUm, epsilonm)
- fvm::Sp(C2_*rhom*epsilonm/km, epsilonm) - fvm::Sp(C2_*epsilonm/km, epsilonm)
+ epsilonSource() + epsilonSource()
); );
@ -669,14 +669,14 @@ void mixtureKEpsilon<BasicTurbulenceModel>::correct()
// Turbulent kinetic energy equation // Turbulent kinetic energy equation
tmp<fvScalarMatrix> kmEqn tmp<fvScalarMatrix> kmEqn
( (
fvm::ddt(rhom, km) fvm::ddt(km)
+ fvm::div(phim, km) + fvm::div(phim, km)
- fvm::Sp(fvc::ddt(rhom) + fvc::div(phim), km) - fvm::Sp(fvc::div(phim), km)
- fvm::laplacian(DkEff(rhom*nutm), km) - fvm::laplacian(DkEff(nutm), km)
== ==
rhom*Gm Gm
- fvm::SuSp((2.0/3.0)*rhom*divUm, km) - fvm::SuSp((2.0/3.0)*divUm, km)
- fvm::Sp(rhom*epsilonm/km, km) - fvm::Sp(epsilonm/km, km)
+ kSource() + kSource()
); );