Spalart-Allmaras one-transport-equation linear-eddy-viscosity turbulence closure model for incompressible and compressible external flows.
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| | TypeName ("SpalartAllmaras") |
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| | SpalartAllmaras (const alphaField &alpha, const rhoField &rho, const volVectorField &U, const surfaceScalarField &alphaRhoPhi, const surfaceScalarField &phi, const transportModel &transport, const word &propertiesName=turbulenceModel::propertiesName, const word &type=typeName) |
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| virtual | ~SpalartAllmaras ()=default |
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| virtual bool | read () |
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| tmp< volScalarField > | DnuTildaEff () const |
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| virtual tmp< volScalarField > | k () const |
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| virtual tmp< volScalarField > | epsilon () const |
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| virtual tmp< volScalarField > | omega () const |
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| virtual void | correct () |
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| | eddyViscosity (const word &modelName, const alphaField &alpha, const rhoField &rho, const volVectorField &U, const surfaceScalarField &alphaRhoPhi, const surfaceScalarField &phi, const transportModel &transport, const word &propertiesName) |
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| virtual | ~eddyViscosity ()=default |
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| virtual tmp< volScalarField > | nut () const |
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| virtual tmp< scalarField > | nut (const label patchi) const |
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| virtual tmp< volScalarField > | k () const=0 |
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| virtual tmp< volSymmTensorField > | R () const |
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| virtual void | validate () |
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| | linearViscousStress (const word &modelName, const alphaField &alpha, const rhoField &rho, const volVectorField &U, const surfaceScalarField &alphaRhoPhi, const surfaceScalarField &phi, const transportModel &transport, const word &propertiesName) |
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| virtual | ~linearViscousStress ()=default |
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| virtual tmp< volSymmTensorField > | devRhoReff () const |
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| virtual tmp< volSymmTensorField > | devRhoReff (const volVectorField &U) const |
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| virtual tmp< fvVectorMatrix > | divDevRhoReff (volVectorField &U) const |
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| virtual tmp< fvVectorMatrix > | divDevRhoReff (const volScalarField &rho, volVectorField &U) const |
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| | TypeName ("RAS") |
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| | declareRunTimeSelectionTable (autoPtr, RASModel, dictionary,(const alphaField &alpha, const rhoField &rho, const volVectorField &U, const surfaceScalarField &alphaRhoPhi, const surfaceScalarField &phi, const transportModel &transport, const word &propertiesName),(alpha, rho, U, alphaRhoPhi, phi, transport, propertiesName)) |
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| | RASModel (const word &type, const alphaField &alpha, const rhoField &rho, const volVectorField &U, const surfaceScalarField &alphaRhoPhi, const surfaceScalarField &phi, const transportModel &transport, const word &propertiesName) |
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| virtual | ~RASModel ()=default |
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| const dimensionedScalar & | kMin () const |
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| const dimensionedScalar & | epsilonMin () const |
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| const dimensionedScalar & | omegaMin () const |
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| dimensionedScalar & | kMin () |
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| dimensionedScalar & | epsilonMin () |
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| dimensionedScalar & | omegaMin () |
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| virtual const dictionary & | coeffDict () const |
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| virtual tmp< volScalarField > | nuEff () const |
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| virtual tmp< scalarField > | nuEff (const label patchi) const |
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template<class BasicTurbulenceModel>
class Foam::RASModels::SpalartAllmaras< BasicTurbulenceModel >
Spalart-Allmaras one-transport-equation linear-eddy-viscosity turbulence closure model for incompressible and compressible external flows.
Required fields
nuTilda | Modified kinematic viscosity [m2/s]
References:
Standard model:
Spalart, P.R., & Allmaras, S.R. (1994).
A one-equation turbulence model for aerodynamic flows.
La Recherche Aerospatiale, 1, 5-21.
Standard model without trip and ft2 terms (tag:R):
Rumsey, C. (2020).
The Spalart-Allmaras Turbulence Model.
Spalart-Allmaras One-Equation Model without ft2 Term (SA-noft2).
https://turbmodels.larc.nasa.gov/spalart.html#sanoft2
(Retrieved:12-01-2021).
Estimation expression for k and epsilon (tag:B), Eq. 4.50:
Bourgoin, A. (2019).
Bathymetry induced turbulence modelling the
Alderney Race site: regional approach with TELEMAC-LES.
Normandie Université.
Estimation expressions for omega (tag:P):
Pope, S. B. (2000).
Turbulent flows.
Cambridge, UK: Cambridge Univ. Press
DOI:10.1017/CBO9780511840531
- Usage
- Example by using
constant/turbulenceProperties: RAS
{
// Mandatory entries (unmodifiable)
RASModel SpalartAllmaras;
// Optional entries (runtime modifiable)
turbulence on;
printCoeffs on;
SpalartAllmarasCoeffs
{
sigmaNut 0.66666;
kappa 0.41;
Cb1 0.1355;
Cb2 0.622;
Cw2 0.3;
Cw3 2.0;
Cv1 7.1;
Cs 0.3;
}
}
- Note
- The model is implemented without the trip-term since the model has almost always been used in fully turbulent applications rather than those where laminar-turbulent transition occurs.
- It has been argued that the
ft2 term is not needed in the absence of the trip-term, hence ft2 term is also not implementated.
- The
Stilda generation term should never be allowed to be zero or negative to avoid potential numerical issues and unphysical results for complex flows. To this end, a limiter proposed by Spalart (R:Note-1(b)) is applied onto Stilda where Stilda is clipped at Cs*Omega with the default value of Cs=0.3.
- The model does not produce
k, epsilon or omega. Nevertheless, these quantities can be estimated by using an approximate expressions for turbulent kinetic energy and dissipation rate reported in (B:Eq. 4.50).
- Source files
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Definition at line 128 of file SpalartAllmaras.H.
Public Types inherited from eddyViscosity< RASModel< BasicTurbulenceModel > >
1.8.17