Spalart-Allmaras one-transport-equation linear-eddy-viscosity turbulence closure model for incompressible and compressible external flows. More...

Inheritance diagram for SpalartAllmaras< BasicTurbulenceModel >:

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Collaboration diagram for SpalartAllmaras< BasicTurbulenceModel >:

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Public Types
typedef BasicTurbulenceModel::alphaField	alphaField

typedef BasicTurbulenceModel::rhoField	rhoField

typedef BasicTurbulenceModel::transportModel	transportModel

Public Types inherited from SpalartAllmarasBase< eddyViscosity< RASModel< BasicTurbulenceModel > > >
typedef eddyViscosity< RASModel< BasicTurbulenceModel > > ::alphaField	alphaField

typedef eddyViscosity< RASModel< BasicTurbulenceModel > > ::rhoField	rhoField

typedef eddyViscosity< RASModel< BasicTurbulenceModel > > ::transportModel	transportModel

Public Types inherited from eddyViscosity< RASModel< BasicTurbulenceModel > >
typedef RASModel< BasicTurbulenceModel > ::alphaField	alphaField

typedef RASModel< BasicTurbulenceModel > ::rhoField	rhoField

typedef RASModel< BasicTurbulenceModel > ::transportModel	transportModel

Public Types inherited from linearViscousStress< RASModel< BasicTurbulenceModel > >
typedef RASModel< BasicTurbulenceModel > ::alphaField	alphaField

typedef RASModel< BasicTurbulenceModel > ::rhoField	rhoField

typedef RASModel< BasicTurbulenceModel > ::transportModel	transportModel

Public Types inherited from RASModel< BasicTurbulenceModel >
typedef BasicTurbulenceModel::alphaField	alphaField

typedef BasicTurbulenceModel::rhoField	rhoField

typedef BasicTurbulenceModel::transportModel	transportModel

Public Member Functions
	TypeName ("SpalartAllmaras")
	Runtime type information. More...

	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)
	Construct from components. More...

virtual	~SpalartAllmaras ()=default
	Destructor. More...

Public Member Functions inherited from SpalartAllmarasBase< eddyViscosity< RASModel< BasicTurbulenceModel > > >
	SpalartAllmarasBase (const word &type, const alphaField &alpha, const rhoField &rho, const volVectorField &U, const surfaceScalarField &alphaRhoPhi, const surfaceScalarField &phi, const transportModel &transport, const word &propertiesName=turbulenceModel::propertiesName)
	Construct from components. More...

virtual	~SpalartAllmarasBase ()=default
	Destructor. More...

virtual bool	read ()
	Re-read model coefficients if they have changed. More...

tmp< volScalarField >	DnuTildaEff () const
	Return the effective diffusivity for nuTilda. More...

virtual tmp< volScalarField >	k () const
	Return the (estimated) turbulent kinetic energy. More...

virtual tmp< volScalarField >	epsilon () const
	Return the (estimated) turbulent kinetic energy dissipation rate. More...

virtual tmp< volScalarField >	omega () const
	Return the (estimated) specific dissipation rate. More...

tmp< volScalarField >	nuTilda () const
	Return the modified kinematic viscosity. More...

virtual void	correct ()
	Correct nuTilda and related properties. More...

Public Member Functions inherited from eddyViscosity< RASModel< BasicTurbulenceModel > >
	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)
	Construct from components. More...

virtual	~eddyViscosity ()=default
	Destructor. More...

virtual tmp< volScalarField >	nut () const
	Return the turbulence viscosity. More...

virtual tmp< scalarField >	nut (const label patchi) const
	Return the turbulence viscosity on patch. More...

virtual tmp< volSymmTensorField >	R () const
	Return the Reynolds stress tensor. More...

virtual void	validate ()
	Validate the turbulence fields after construction. More...

Public Member Functions inherited from linearViscousStress< RASModel< BasicTurbulenceModel > >
	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)
	Construct from components. More...

virtual	~linearViscousStress ()=default
	Destructor. More...

virtual tmp< volSymmTensorField >	devRhoReff () const
	Return the effective stress tensor. More...

virtual tmp< volSymmTensorField >	devRhoReff (const volVectorField &U) const
	Return the effective stress tensor based on a given velocity field. More...

virtual tmp< fvVectorMatrix >	divDevRhoReff (volVectorField &U) const
	Return the source term for the momentum equation. More...

virtual tmp< fvVectorMatrix >	divDevRhoReff (const volScalarField &rho, volVectorField &U) const
	Return the source term for the momentum equation. More...

Public Member Functions inherited from RASModel< BasicTurbulenceModel >
	TypeName ("RAS")
	Runtime type information. More...

	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))

	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)
	Construct from components. More...

virtual	~RASModel ()=default
	Destructor. More...

const dimensionedScalar &	kMin () const noexcept
	Return the lower allowable limit for k (default: SMALL) More...

const dimensionedScalar &	epsilonMin () const noexcept
	Return the lower allowable limit for epsilon (default: SMALL) More...

const dimensionedScalar &	omegaMin () const noexcept
	Return the lower allowable limit for omega (default: SMALL) More...

dimensionedScalar &	kMin () noexcept
	Allow kMin to be changed. More...

dimensionedScalar &	epsilonMin () noexcept
	Allow epsilonMin to be changed. More...

dimensionedScalar &	omegaMin () noexcept
	Allow omegaMin to be changed. More...

virtual const dictionary &	coeffDict () const
	Const access to the coefficients dictionary. More...

virtual tmp< volScalarField >	nuEff () const
	Return the effective viscosity. More...

virtual tmp< scalarField >	nuEff (const label patchi) const
	Return the effective viscosity on patch. More...

Public Member Functions inherited from RASModelBase
	ClassName ("RASModelBase")
	Runtime type information. More...

	RASModelBase () noexcept=default
	Constructor. More...

virtual	~RASModelBase ()=default
	Destructor. More...

Protected Member Functions
virtual tmp< volScalarField >	dTilda (const volScalarField &chi, const volScalarField &fv1, const volTensorField &gradU) const
	Return the length scale. More...

virtual void	correctNut ()

Protected Member Functions inherited from SpalartAllmarasBase< eddyViscosity< RASModel< BasicTurbulenceModel > > >
tmp< volScalarField >	chi () const

tmp< volScalarField >	fv1 (const volScalarField &chi) const

tmp< volScalarField >	fv2 (const volScalarField &chi, const volScalarField &fv1) const

tmp< volScalarField >	ft2 (const volScalarField &chi) const

tmp< volScalarField >	Omega (const volTensorField &gradU) const

tmp< volScalarField >	r (const volScalarField &nur, const volScalarField &Stilda, const volScalarField &dTilda) const

tmp< volScalarField::Internal >	fw (const volScalarField &Stilda, const volScalarField &dTilda) const

virtual tmp< volScalarField >	Stilda (const volScalarField &chi, const volScalarField &fv1, const volTensorField &gradU, const volScalarField &dTilda) const

void	correctNut (const volScalarField &fv1)

Protected Member Functions inherited from RASModel< BasicTurbulenceModel >
virtual void	printCoeffs (const word &type)
	Print model coefficients. More...

	RASModel (const RASModel &)=delete
	No copy construct. More...

void	operator= (const RASModel &)=delete
	No copy assignment. More...

Additional Inherited Members
Static Public Member Functions inherited from RASModel< BasicTurbulenceModel >
static autoPtr< RASModel >	New (const alphaField &alpha, const rhoField &rho, const volVectorField &U, const surfaceScalarField &alphaRhoPhi, const surfaceScalarField &phi, const transportModel &transport, const word &propertiesName=turbulenceModel::propertiesName)
	Return a reference to the selected RAS model. More...

Protected Attributes inherited from SpalartAllmarasBase< eddyViscosity< RASModel< BasicTurbulenceModel > > >
dimensionedScalar	sigmaNut_

dimensionedScalar	kappa_

dimensionedScalar	Cb1_

dimensionedScalar	Cb2_

dimensionedScalar	Cw1_

dimensionedScalar	Cw2_

dimensionedScalar	Cw3_

dimensionedScalar	Cv1_

dimensionedScalar	Cs_

dimensionedScalar	ck_

Switch	ft2_

dimensionedScalar	Ct3_

dimensionedScalar	Ct4_

volScalarField	nuTilda_
	Modified kinematic viscosity [m^2/s]. More...

const volScalarField &	y_
	Wall distance. More...

Protected Attributes inherited from eddyViscosity< RASModel< BasicTurbulenceModel > >
volScalarField	nut_

Protected Attributes inherited from RASModel< BasicTurbulenceModel >
dictionary	RASDict_
	RAS coefficients dictionary. More...

Switch	turbulence_
	Turbulence on/off flag. More...

Switch	printCoeffs_
	Flag to print the model coeffs at run-time. More...

dictionary	coeffDict_
	Model coefficients dictionary. More...

dimensionedScalar	kMin_
	Lower limit of k. More...

dimensionedScalar	epsilonMin_
	Lower limit of epsilon. More...

dimensionedScalar	omegaMin_
	Lower limit for omega. More...

Detailed Description

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).

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.
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

Definition at line 115 of file SpalartAllmaras.H.

Member Typedef Documentation

◆ alphaField

typedef BasicTurbulenceModel::alphaField alphaField

Definition at line 151 of file SpalartAllmaras.H.

◆ rhoField

typedef BasicTurbulenceModel::rhoField rhoField

Definition at line 152 of file SpalartAllmaras.H.

◆ transportModel

typedef BasicTurbulenceModel::transportModel transportModel

Definition at line 153 of file SpalartAllmaras.H.

Constructor & Destructor Documentation

◆ SpalartAllmaras()

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`
	)

Construct from components.

Definition at line 61 of file SpalartAllmaras.C.

References Foam::type().

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◆ ~SpalartAllmaras()

virtual ~SpalartAllmaras ( )

virtualdefault

Destructor.

Member Function Documentation

◆ dTilda()

Foam::tmp< Foam::volScalarField > dTilda	(	const volScalarField &	chi,
		const volScalarField &	fv1,
		const volTensorField &	gradU
	)		const

protectedvirtual

Return the length scale.

Implements SpalartAllmarasBase< eddyViscosity< RASModel< BasicTurbulenceModel > > >.

Definition at line 35 of file SpalartAllmaras.C.

◆ correctNut()

void correctNut ( )

protectedvirtual

Reimplemented from SpalartAllmarasBase< eddyViscosity< RASModel< BasicTurbulenceModel > > >.

Definition at line 46 of file SpalartAllmaras.C.

References SpalartAllmarasBase< BasicEddyViscosityModel >::correctNut().

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◆ TypeName()

TypeName ( "SpalartAllmaras< BasicTurbulenceModel >" )

Runtime type information.

The documentation for this class was generated from the following files:

src/TurbulenceModels/turbulenceModels/RAS/SpalartAllmaras/SpalartAllmaras.H
src/TurbulenceModels/turbulenceModels/RAS/SpalartAllmaras/SpalartAllmaras.C

Public Types

Public Member Functions

Protected Member Functions

Additional Inherited Members