interfaceProperties.H

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Class
    Foam::interfaceProperties

Description
    Contains the interface properties.

    Properties to aid interFoam:
    -# Correct the alpha boundary condition for dynamic contact angle.
    -# Calculate interface curvature.

    References:
    \verbatim
        Smoother algorithm for interface curvatures (tag:YK):
            Yamamoto, T. & Komarov, S. V. (2022).
            Evaluation on different volume of fluid methods in
            unstructured solver under the optimized condition. Preprint.
            DOI:10.13140/RG.2.2.17223.37281
    \endverbatim

SourceFiles
    interfaceProperties.C

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

#ifndef interfaceProperties_H
#define interfaceProperties_H

#include "IOdictionary.H"
#include "surfaceTensionModel.H"
#include "volFields.H"
#include "surfaceFields.H"

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

namespace Foam
{

/*---------------------------------------------------------------------------*\
                     Class interfaceProperties Declaration
\*---------------------------------------------------------------------------*/

class interfaceProperties
{
    // Private data

        //- Keep a reference to the transportProperties dictionary
        const dictionary& transportPropertiesDict_;

        //- Number of iterations to smooth interfacial curvatures
        int nAlphaSmoothCurvature_;

        //- Compression coefficient
        scalar cAlpha_;

        //- Surface tension
        autoPtr<surfaceTensionModel> sigmaPtr_;

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

        const volScalarField& alpha1_;
        const volVectorField& U_;
        surfaceScalarField nHatf_;
        volScalarField K_;


    // Private Member Functions

        //- No copy construct
        interfaceProperties(const interfaceProperties&) = delete;

        //- No copy assignment
        void operator=(const interfaceProperties&) = delete;

        //- Correction for the boundary condition on the unit normal nHat on
        //  walls to produce the correct contact dynamic angle
        //  calculated from the component of U parallel to the wall
        void correctContactAngle
        (
            surfaceVectorField::Boundary& nHat,
            const surfaceVectorField::Boundary& gradAlphaf
        ) const;

        //- Re-calculate the interface curvature
        void calculateK();


public:

    // Constructors

        //- Construct from volume fraction field gamma and IOdictionary
        interfaceProperties
        (
            const volScalarField& alpha1,
            const volVectorField& U,
            const IOdictionary&
        );


    // Member Functions

        scalar cAlpha() const
        {
            return cAlpha_;
        }

        const dimensionedScalar& deltaN() const
        {
            return deltaN_;
        }

        const surfaceScalarField& nHatf() const
        {
            return nHatf_;
        }

        tmp<volScalarField> sigmaK() 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;

        void correct();

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


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

} // End namespace Foam

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

#endif

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