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ENH: DESModel - stabilisation of Ssigma function

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- Code supplied by Marian Fuchs, Upstream CFD GmbH
This commit is contained in:
Andrew Heather 2022-08-10 10:29:13 +01:00
parent 07a9ee86f3
commit 12ba22bebf
1 changed files with 26 additions and 28 deletions
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54
src/TurbulenceModels/turbulenceModels/DES/DESModel/DESModel.C
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@ -91,36 +91,35 @@ tmp<volScalarField> DESModel<BasicTurbulenceModel>::Ssigma
const dimensionedScalar& coeff const dimensionedScalar& coeff
) )
{ {
const volTensorField G(gradU.T() & gradU); // Limiter
const dimensionedScalar eps0("eps0", dimless, SMALL);
const dimensionedScalar eps2("eps2", dimless/sqr(dimTime), SMALL);
const dimensionedScalar eps4("eps4", dimless/pow4(dimTime), SMALL);
const dimensionedScalar max2("max2", dimless/sqr(dimTime), GREAT);
const dimensionedTensor maxTen2
(
"maxTen2",
dimless/sqr(dimTime),
tensor::max
);
const dimensionedTensor minTen2
(
"minTen2",
dimless/sqr(dimTime),
tensor::min
);
const volTensorField G(max(min(gradU.T() & gradU, maxTen2), minTen2));
// Tensor invariants // Tensor invariants
const volScalarField I1(tr(G)); const volScalarField I1(tr(G));
const volScalarField I2(0.5*(sqr(tr(G)) - tr(G & G))); const volScalarField I2(0.5*(sqr(I1) - tr(G & G)));
const volScalarField I3(det(G)); const volScalarField I3(det(G));
const volScalarField alpha1 const volScalarField alpha1(max(sqr(I1)/9.0 - I2/3.0, eps4));
(
max
(
sqr(I1)/9.0 - I2/3.0,
dimensionedScalar("SMALL", dimless/pow4(dimTime), SMALL)
)
);
const volScalarField alpha2 const volScalarField alpha2(pow3(min(I1, max2))/27.0 - I1*I2/6.0 + I3/2.0);
(
pow3
(
min
(
I1,
dimensionedScalar("GREAT", dimless/sqr(dimTime), GREAT)
)
)/27.0
- I1*I2/6.0 + I3/2.0
);
const dimensionedScalar eps0("SMALL", dimless, SMALL);
const volScalarField alpha3 const volScalarField alpha3
( (
1.0/3.0 1.0/3.0
@ -134,19 +133,18 @@ tmp<volScalarField> DESModel<BasicTurbulenceModel>::Ssigma
) )
); );
const dimensionedScalar sig0("SMALL", dimless/sqr(dimTime), SMALL);
const scalar piBy3 = constant::mathematical::pi/3.0; const scalar piBy3 = constant::mathematical::pi/3.0;
const volScalarField sigma1 const volScalarField sigma1
( (
sqrt(max(I1/3.0 + 2.0*sqrt(alpha1)*cos(alpha3), sig0)) sqrt(max(I1/3.0 + 2.0*sqrt(alpha1)*cos(alpha3), eps2))
); );
const volScalarField sigma2 const volScalarField sigma2
( (
sqrt(max(I1/3.0 - 2.0*sqrt(alpha1)*cos(piBy3 + alpha3), sig0)) sqrt(max(I1/3.0 - 2.0*sqrt(alpha1)*cos(piBy3 + alpha3), eps2))
); );
const volScalarField sigma3 const volScalarField sigma3
( (
sqrt(max(I1/3.0 - 2.0*sqrt(alpha1)*cos(piBy3 - alpha3), sig0)) sqrt(max(I1/3.0 - 2.0*sqrt(alpha1)*cos(piBy3 - alpha3), eps2))
); );
return return
@ -154,7 +152,7 @@ tmp<volScalarField> DESModel<BasicTurbulenceModel>::Ssigma
*sigma3 *sigma3
*(sigma1 - sigma2) *(sigma1 - sigma2)
*(sigma2 - sigma3) *(sigma2 - sigma3)
/max(sqr(sigma1), sig0); /max(sqr(sigma1), eps2);
} }