multiphaseMixture.H

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License
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Class
    Foam::multiphaseMixture

Description
    Incompressible multi-phase mixture with built in solution for the
    phase fractions with interface compression for interface-capturing.

    Derived from kinematicTransportModel so that it can be used in conjunction
    with the incompressible turbulence models.

    Surface tension and contact-angle is handled for the interface
    between each phase-pair.

SourceFiles
    multiphaseMixture.C

\*---------------------------------------------------------------------------*/

#ifndef multiphaseMixture_H
#define multiphaseMixture_H

#include "kinematicTransportModel.H"
#include "IOdictionary.H"
#include "phase.H"
#include "PtrDictionary.H"
#include "volFields.H"
#include "surfaceFields.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

/*---------------------------------------------------------------------------*\
                      Class multiphaseMixture Declaration
\*---------------------------------------------------------------------------*/

class multiphaseMixture
:
    public IOdictionary,
    public kinematicTransportModel
{
public:

    class interfacePair
    :
        public Pair<word>
    {
    public:

        class hash
        :
            public Hash<interfacePair>
        {
        public:

            hash()
            {}

            label operator()(const interfacePair& key) const
            {
                return word::hash()(key.first()) + word::hash()(key.second());
            }
        };


        // Constructors

            interfacePair()
            {}

            interfacePair(const word& alpha1Name, const word& alpha2Name)
            :
                Pair<word>(alpha1Name, alpha2Name)
            {}

            interfacePair(const phase& alpha1, const phase& alpha2)
            :
                Pair<word>(alpha1.name(), alpha2.name())
            {}


        // Friend Operators

            friend bool operator==
            (
                const interfacePair& a,
                const interfacePair& b
            )
            {
                return
                (
                    ((a.first() == b.first()) && (a.second() == b.second()))
                 || ((a.first() == b.second()) && (a.second() == b.first()))
                );
            }

            friend bool operator!=
            (
                const interfacePair& a,
                const interfacePair& b
            )
            {
                return (!(a == b));
            }
    };


private:

    // Private Data

        //- Dictionary of phases
        PtrDictionary<phase> phases_;

        const fvMesh& mesh_;
        const volVectorField& U_;
        const surfaceScalarField& phi_;

        surfaceScalarField rhoPhi_;
        volScalarField alphas_;

        volScalarField nu_;

        typedef HashTable<scalar, interfacePair, interfacePair::hash>
            sigmaTable;

        sigmaTable sigmas_;
        dimensionSet dimSigma_;

        //- Stabilisation for normalisation of the interface normal
        const dimensionedScalar deltaN_;


    // Private Member Functions

        void calcAlphas();

        void solveAlphas(const scalar cAlpha);

        tmp<surfaceVectorField> nHatfv
        (
            const volScalarField& alpha1,
            const volScalarField& alpha2
        ) const;

        tmp<surfaceScalarField> nHatf
        (
            const volScalarField& alpha1,
            const volScalarField& alpha2
        ) const;

        //- Correction for the boundary condition on the unit normal nHat on
        // walls to produce the correct contact angle.
        //
        // The dynamic contact angle is calculated from the component of the
        // velocity on the direction of the interface, parallel to the wall.
        void correctContactAngle
        (
            const phase& alpha1,
            const phase& alpha2,
            surfaceVectorField::Boundary& nHatb
        ) const;

        tmp<volScalarField> K(const phase& alpha1, const phase& alpha2) const;


public:

    // Constructors

        //- Construct from components
        multiphaseMixture
        (
            const volVectorField& U,
            const surfaceScalarField& phi
        );


    //- Destructor
    virtual ~multiphaseMixture()
    {}


    // Member Functions

        //- Return the phases
        const PtrDictionary<phase>& phases() const
        {
            return phases_;
        }

        //- Return the velocity
        const volVectorField& U() const
        {
            return U_;
        }

        //- Return the volumetric flux
        const surfaceScalarField& phi() const
        {
            return phi_;
        }

        const surfaceScalarField& rhoPhi() const
        {
            return rhoPhi_;
        }

        //- Return the mixture density
        tmp<volScalarField> rho() const;

        //- Return the mixture density for patch
        tmp<scalarField> rho(const label patchi) const;

        //- Return the dynamic laminar viscosity
        tmp<volScalarField> mu() const;

        //- Return the dynamic laminar viscosity for patch
        tmp<scalarField> mu(const label patchi) const;

        //- Return the face-interpolated dynamic laminar viscosity
        tmp<surfaceScalarField> muf() const;

        //- Return the kinematic laminar viscosity
        tmp<volScalarField> nu() const;

        //- Return the laminar viscosity for patch
        tmp<scalarField> nu(const label patchi) const;

        //- Return the face-interpolated dynamic laminar viscosity
        tmp<surfaceScalarField> nuf() const;

        tmp<surfaceScalarField> surfaceTensionForce() const;

        //- Indicator of the proximity of the interface
        //  Field values are 1 near and 0 away for the interface.
        tmp<volScalarField> nearInterface() const;

        //- Solve for the mixture phase-fractions
        void solve();

        //- Correct the mixture properties
        void correct();

        //- Read base transportProperties dictionary
        bool read();
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //