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non-linear turbulence models: corrected generation term and tested

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This commit is contained in:
Henry
2015-02-27 19:22:53 +00:00
parent d05b8e6dd2
commit a9b8f174ce
3 changed files with 11 additions and 33 deletions
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9
src/TurbulenceModels/incompressible/turbulentTransportModels/RAS/LienCubicKE/LienCubicKE.C
View File

@ -306,15 +306,13 @@ void LienCubicKE::correct()
tmp<volTensorField> tgradU = fvc::grad(U_);
const volTensorField& gradU = tgradU();
// generation term
tmp<volScalarField> S2 = symm(gradU) && gradU;
volScalarField G
(
GName(),
Cmu_*sqr(k_)/epsilon_*S2 - (nonlinearStress_ && gradU)
(nut_*twoSymm(gradU) - nonlinearStress_) && gradU
);
// Update epsilon and G at the wall
epsilon_.boundaryField().updateCoeffs();
@ -330,15 +328,12 @@ void LienCubicKE::correct()
);
epsEqn().relax();
epsEqn().boundaryManipulate(epsilon_.boundaryField());
solve(epsEqn);
bound(epsilon_, epsilonMin_);
// Turbulent kinetic energy equation
tmp<fvScalarMatrix> kEqn
(
fvm::ddt(k_)

10
src/TurbulenceModels/incompressible/turbulentTransportModels/RAS/LienCubicKELowRe/LienCubicKELowRe.C
View File

@ -371,9 +371,6 @@ void LienCubicKELowRe::correct()
tmp<volTensorField> tgradU = fvc::grad(U_);
const volTensorField& gradU = tgradU();
// generation term
tmp<volScalarField> S2 = symm(gradU) && gradU;
yStar_ = sqrt(k_)*y_/nu() + SMALL;
tmp<volScalarField> Rt = sqr(k_)/(nu()*epsilon_);
@ -385,7 +382,7 @@ void LienCubicKELowRe::correct()
volScalarField G
(
GName(),
Cmu_*fMu()*sqr(k_)/epsilon_*S2 - (nonlinearStress_ && gradU)
(nut_*twoSymm(gradU) - nonlinearStress_) && gradU
);
// Dissipation equation
@ -404,16 +401,11 @@ void LienCubicKELowRe::correct()
);
epsEqn().relax();
#include "LienCubicKELowReSetWallDissipation.H"
#include "wallDissipationI.H"
solve(epsEqn);
bound(epsilon_, epsilonMin_);
// Turbulent kinetic energy equation
tmp<fvScalarMatrix> kEqn
(
fvm::ddt(k_)

25
src/TurbulenceModels/incompressible/turbulentTransportModels/RAS/LienLeschzinerLowRe/LienLeschzinerLowRe.C
View File

@ -243,21 +243,15 @@ void LienLeschzinerLowRe::correct()
return;
}
tmp<volTensorField> tgradU = fvc::grad(U_);
volScalarField G(GName(), nut_*(tgradU() && twoSymm(tgradU())));
tgradU.clear();
scalar Cmu75 = pow(Cmu_.value(), 0.75);
const volTensorField gradU(fvc::grad(U_));
// generation term
tmp<volScalarField> S2 = symm(gradU) && gradU;
yStar_ = sqrt(k_)*y_/nu() + SMALL;
tmp<volScalarField> Rt = sqr(k_)/(nu()*epsilon_);
const volScalarField f2(scalar(1) - 0.3*exp(-sqr(Rt)));
volScalarField G(GName(), Cmu_*fMu()*sqr(k_)/epsilon_*S2);
// Dissipation equation
tmp<fvScalarMatrix> epsEqn
(
@ -266,24 +260,21 @@ void LienLeschzinerLowRe::correct()
- fvm::laplacian(DepsilonEff(), epsilon_)
==
C1_*G*epsilon_/k_
// E-term
+ C2_*f2*Cmu75*sqrt(k_)
/(kappa_*y_*(scalar(1) - exp(-Aepsilon_*yStar_)))
*exp(-Amu_*sqr(yStar_))*epsilon_
/(kappa_*y_*(scalar(1) - exp(-Aepsilon_*yStar_)))
*exp(-Amu_*sqr(yStar_))*epsilon_
- fvm::Sp(C2_*f2*epsilon_/k_, epsilon_)
);
epsEqn().relax();
#include "LienLeschzinerLowReSetWallDissipation.H"
#include "wallDissipationI.H"
solve(epsEqn);
bound(epsilon_, epsilonMin_);
// Turbulent kinetic energy equation
tmp<fvScalarMatrix> kEqn
(
fvm::ddt(k_)