phasePressureModel.H

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    Copyright (C) 2020 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
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Class
    Foam::RASModels::phasePressureModel
 
Description
    Particle-particle phase-pressure RAS model
 
    The derivative of the phase-pressure with respect to the phase-fraction
    is evaluated as
 
        g0*min(exp(preAlphaExp*(alpha - alphaMax)), expMax)
 
    The default model coefficients correspond to the following:
    \verbatim
        phasePressureCoeffs
        {
            preAlphaExp     500;
            expMax          1000;
            alphaMax        0.62;
            g0              1000;
        }
    \endverbatim
 
SourceFiles
    phasePressureModel.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef phasePressureModel_H
#define phasePressureModel_H
 
#include "RASModel.H"
#include "eddyViscosity.H"
#include "phaseCompressibleTurbulenceModel.H"
#include "EddyDiffusivity.H"
#include "phaseModel.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace RASModels
{
 
/*---------------------------------------------------------------------------*\
                           Class phasePressureModel Declaration
\*---------------------------------------------------------------------------*/
 
class phasePressureModel
:
    public eddyViscosity
    <
        RASModel<EddyDiffusivity<phaseCompressibleTurbulenceModel>>
    >
{
    // Private Data
 
        // Kinetic Theory Model coefficients
 
            //- Maximum packing phase-fraction
            scalar alphaMax_;
 
            //- Pre-exponential factor
            scalar preAlphaExp_;
 
            //- Maximum limit of the exponential
            scalar expMax_;
 
            //- g0
            dimensionedScalar g0_;
 
 
    // Private Member Functions
 
        //- Disabled
        void correctNut()
        {}
 
        //- No copy construct
        phasePressureModel(const phasePressureModel&) = delete;
 
        //- No copy assignment
        void operator=(const phasePressureModel&) = delete;
 
 
public:
 
    //- Runtime type information
    TypeName("phasePressure");
 
 
    // Constructors
 
        //- Construct from components
        phasePressureModel
        (
            const volScalarField& alpha,
            const volScalarField& rho,
            const volVectorField& U,
            const surfaceScalarField& alphaRhoPhi,
            const surfaceScalarField& phi,
            const phaseModel& transport,
            const word& propertiesName = turbulenceModel::propertiesName,
            const word& type = typeName
        );
 
 
    //- Destructor
    virtual ~phasePressureModel() = default;
 
 
    // Member Functions
 
        //- Re-read model coefficients if they have changed
        virtual bool read();
 
        //- Return the effective viscosity
        virtual tmp<volScalarField> nuEff() const
        {
            return this->nut();
        }
 
        //- Return the effective viscosity on patch
        virtual tmp<scalarField> nuEff(const label patchi) const
        {
            return this->nut(patchi);
        }
 
        //- Return the turbulence kinetic energy
        virtual tmp<volScalarField> k() const;
 
        //- Return the turbulence kinetic energy dissipation rate
        virtual tmp<volScalarField> epsilon() const;
 
        //- Return the specific dissipation rate
        virtual tmp<volScalarField> omega() const;
 
        //- Return the Reynolds stress tensor
        virtual tmp<volSymmTensorField> R() const;
 
        //- Return the phase-pressure'
        // (derivative of phase-pressure w.r.t. phase-fraction)
        virtual tmp<volScalarField> pPrime() const;
 
        //- Return the face-phase-pressure'
        // (derivative of phase-pressure w.r.t. phase-fraction)
        virtual tmp<surfaceScalarField> pPrimef() const;
 
        //- Return the effective stress tensor
        virtual tmp<volSymmTensorField> devRhoReff() const;
 
        //- Return the effective stress tensor based on a given velocity field
        virtual tmp<volSymmTensorField> devRhoReff
        (
            const volVectorField& U
        ) const;
 
        //- Return the source term for the momentum equation
        virtual tmp<fvVectorMatrix> divDevRhoReff(volVectorField& U) const;
 
        //- Solve the kinetic theory equations and correct the viscosity
        virtual void correct();
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace RASModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //