unityLewisEddyDiffusivity.H

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License
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Class
    Foam::turbulenceThermophysicalTransportModels::unityLewisEddyDiffusivity
 
Description
    Eddy-diffusivity based energy gradient heat flux model for RAS or LES
    of turbulent flow.  Specie fluxes are computed assuming a unity turbulent
    Lewis number.
 
Usage
    \verbatim
    LES
    {
        model           unityLewisEddyDiffusivity;
        Prt             0.85;
    }
    \endverbatim
 
SourceFiles
    unityLewisEddyDiffusivity.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef unityLewisEddyDiffusivity_H
#define unityLewisEddyDiffusivity_H
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace turbulenceThermophysicalTransportModels
{
 
/*---------------------------------------------------------------------------*\
                       Class unityLewisEddyDiffusivity Declaration
\*---------------------------------------------------------------------------*/
 
template<class TurbulenceThermophysicalTransportModel>
class unityLewisEddyDiffusivity
:
    public TurbulenceThermophysicalTransportModel
{
 
protected:
 
    // Protected data
 
        // Model coefficients
 
            //- Turbulent Prandtl number []
            dimensionedScalar Prt_;
 
        // Fields
 
            //- Turbulent thermal diffusivity of enthalpy [kg/m/s]
            volScalarField alphat_;
 
 
    // Protected Member Functions
 
        virtual void correctAlphat();
 
        //- Effective thermal turbulent diffusivity of mixture [kg/m/s]
        //  Used for the implicit energy correction on the temperature laplacian
        virtual tmp<volScalarField> alphaEff() const
        {
            return this->thermo().kappa()/this->thermo().Cpv() + alphat();
        }
 
 
public:
 
    typedef typename TurbulenceThermophysicalTransportModel::alphaField
        alphaField;
 
    typedef typename
        TurbulenceThermophysicalTransportModel::momentumTransportModel
        momentumTransportModel;
 
    typedef typename TurbulenceThermophysicalTransportModel::thermoModel
        thermoModel;
 
 
    //- Runtime type information
    TypeName("unityLewisEddyDiffusivity");
 
 
    // Constructors
 
        //- Construct from a momentum transport model and a thermo model
        unityLewisEddyDiffusivity
        (
            const momentumTransportModel& momentumTransport,
            const thermoModel& thermo,
            const bool allowDefaultPrt = false
        );
 
        //- Construct from a type name, a momentum transport model and a thermo
        //  model, and whether to default the turbulent Prandtl number to one
        //  if it is not specified
        unityLewisEddyDiffusivity
        (
            const word& type,
            const momentumTransportModel& momentumTransport,
            const thermoModel& thermo,
            const bool allowDefaultPrt = false
        );
 
 
    //- Destructor
    virtual ~unityLewisEddyDiffusivity()
    {}
 
 
    // Member Functions
 
        //- Read thermophysicalTransport dictionary
        virtual bool read();
 
        //- Turbulent thermal diffusivity for enthalpy [kg/m/s]
        virtual tmp<volScalarField> alphat() const
        {
            return alphat_;
        }
 
        //- Turbulent thermal diffusivity for enthalpy for a patch [kg/m/s]
        virtual tmp<scalarField> alphat(const label patchi) const
        {
            return alphat()().boundaryField()[patchi];
        }
 
        //- Effective thermal turbulent conductivity
        //  of mixture [W/m/K]
        virtual tmp<volScalarField> kappaEff() const
        {
            return this->thermo().kappa() + this->thermo().Cp()*alphat();
        }
 
        //- Effective thermal turbulent conductivity
        //  of mixture for patch [W/m/K]
        virtual tmp<scalarField> kappaEff(const label patchi) const
        {
            return
                this->thermo().kappa().boundaryField()[patchi]
              + this->thermo().Cp().boundaryField()[patchi]*alphat(patchi);
        }
 
        //- Effective mass diffusion coefficient
        //  for a given specie mass-fraction [kg/m/s]
        virtual tmp<volScalarField> DEff(const volScalarField& Yi) const
        {
            return volScalarField::New
            (
                "DEff",
                this->thermo().kappa()/this->thermo().Cp() + alphat()
            );
        }
 
        //- Effective mass diffusion coefficient
        //  for a given specie mass-fraction for patch [kg/m/s]
        virtual tmp<scalarField> DEff
        (
            const volScalarField& Yi,
            const label patchi
        ) const
        {
            return
                this->thermo().kappa().boundaryField()[patchi]
               /this->thermo().Cp().boundaryField()[patchi]
              + alphat(patchi);
        }
 
        //- Return the heat flux [W/m^2]
        virtual tmp<surfaceScalarField> q() const;
 
        //- Return the source term for the energy equation
        virtual tmp<fvScalarMatrix> divq(volScalarField& he) const;
 
        //- Return the specie flux for the given specie mass-fraction [kg/m^2/s]
        virtual tmp<surfaceScalarField> j(const volScalarField& Yi) const;
 
        //- Return the source term for the given specie mass-fraction equation
        virtual tmp<fvScalarMatrix> divj(volScalarField& Yi) const;
 
        //- Correct the unityLewisEddyDiffusivity viscosity
        virtual void predict();
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace turbulenceThermophysicalTransportModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "unityLewisEddyDiffusivity.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //