multiphaseMixture.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2021 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
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    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
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    for more details.
 
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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 transportModel so that it can be unused 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 "incompressible/transportModel/transportModel.H"
#include "IOdictionary.H"
#include "phase.H"
#include "PtrDictionary.H"
#include "volFields.H"
#include "surfaceFields.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Class forward declarations
class alphaContactAngleFvPatchScalarField;
 
/*---------------------------------------------------------------------------*\
                      Class multiphaseMixture Declaration
\*---------------------------------------------------------------------------*/
 
class multiphaseMixture
:
    public IOdictionary,
    public transportModel
{
public:
 
    //- Symmetric pair of interface names
    class interfacePair
    :
        public Pair<word>
    {
    public:
 
        // Always use symmetric hashing
        using hasher = Pair<word>::symmHasher;
 
        // Always use symmetric hashing (alias)
        using hash = Pair<word>::symmHasher;
 
 
        // Constructors
 
            interfacePair() = default;
 
            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 (0 != Pair<word>::compare(a, b));
            }
 
            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;
 
        void correctContactAngle
        (
            const phase& alpha1,
            const phase& alpha2,
            surfaceVectorField::Boundary& nHatb
        ) const;
 
        void correctBoundaryContactAngle
        (
            const alphaContactAngleFvPatchScalarField& acap,
            label patchi,
            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() = default;
 
 
    // 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
 
// ************************************************************************* //