threePhaseInterfaceProperties.H

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
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License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::threePhaseInterfaceProperties
 
Description
    Properties to aid interFoam :
    1. Correct the alpha boundary condition for dynamic contact angle.
    2. Calculate interface curvature.
 
SourceFiles
    threePhaseInterfaceProperties.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef threePhaseInterfaceProperties_H
#define threePhaseInterfaceProperties_H
 
#include "incompressibleThreePhaseMixture.H"
#include "surfaceFields.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
              Class threePhaseInterfaceProperties Declaration
\*---------------------------------------------------------------------------*/
 
class threePhaseInterfaceProperties
{
    // Private data
 
        const incompressibleThreePhaseMixture& mixture_;
 
        //- Compression coefficient
        scalar cAlpha_;
 
        //- Surface tension 1-2
        dimensionedScalar sigma12_;
 
        //- Surface tension 1-3
        dimensionedScalar sigma13_;
 
        //- Stabilisation for normalisation of the interface normal
        const dimensionedScalar deltaN_;
 
        surfaceScalarField nHatf_;
        volScalarField K_;
 
 
    // Private Member Functions
 
        //- Disallow default bitwise copy construct and assignment
        threePhaseInterfaceProperties(const threePhaseInterfaceProperties&);
        void operator=(const threePhaseInterfaceProperties&);
 
        //- 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::GeometricBoundaryField& nHat
        ) const;
 
        //- Re-calculate the interface curvature
        void calculateK();
 
 
public:
 
    //- Conversion factor for degrees into radians
    static const scalar convertToRad;
 
 
    // Constructors
 
        //- Construct from volume fraction field alpha and IOdictionary
        threePhaseInterfaceProperties
        (
            const incompressibleThreePhaseMixture& mixture
        );
 
 
    // Member Functions
 
        scalar cAlpha() const
        {
            return cAlpha_;
        }
 
        const dimensionedScalar& deltaN() const
        {
            return deltaN_;
        }
 
        const surfaceScalarField& nHatf() const
        {
            return nHatf_;
        }
 
        const volScalarField& K() const
        {
            return K_;
        }
 
        tmp<volScalarField> sigma() const
        {
            volScalarField limitedAlpha2(max(mixture_.alpha2(), scalar(0)));
            volScalarField limitedAlpha3(max(mixture_.alpha3(), scalar(0)));
 
            return
                (limitedAlpha2*sigma12_ + limitedAlpha3*sigma13_)
               /(limitedAlpha2 + limitedAlpha3 + SMALL);
        }
 
        tmp<volScalarField> sigmaK() const
        {
            return sigma()*K_;
        }
 
        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()
        {
            calculateK();
        }
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //