alphaContactAngleFvPatchScalarField.H

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/*---------------------------------------------------------------------------*\
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License
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    under the terms of the GNU General Public License as published by
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Class
    Foam::alphaContactAngleFvPatchScalarField

Description
    Abstract base class for alphaContactAngle boundary conditions.

    Derived classes must implement the theta() function which returns the
    wall contact angle field.

    The essential entry "limit" controls the gradient of alpha1 on the wall:
      - none - Calculate the gradient from the contact-angle without limiter
      - gradient - Limit the wall-gradient such that alpha1 remains bounded
        on the wall
      - alpha - Bound the calculated alpha1 on the wall
      - zeroGradient - Set the gradient of alpha1 to 0 on the wall, i.e.
        reproduce previous behaviour, the pressure BCs can be left as before.

    Note that if any of the first three options are used the boundary condition
    on \c p_rgh must set to guarantee that the flux is corrected to be zero at
    the wall e.g.:

    \verbatim
    <patchName>
    {
        type            alphaContactAngle;
        limit           none;
    }
    \endverbatim

SourceFiles
    alphaContactAngleFvPatchScalarField.C

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

#ifndef alphaContactAngleFvPatchScalarField_H
#define alphaContactAngleFvPatchScalarField_H

#include "fixedGradientFvPatchFields.H"
#include "fvsPatchFields.H"

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namespace Foam
{

/*---------------------------------------------------------------------------*\
             Class alphaContactAngleFvPatchScalarField Declaration
\*---------------------------------------------------------------------------*/

class alphaContactAngleFvPatchScalarField
:
    public fixedGradientFvPatchScalarField
{

public:

    //- Runtime type information
    TypeName("alphaContactAngle");

    //- Alpha limit options
    enum limitControls
    {
        lcNone,
        lcGradient,
        lcZeroGradient,
        lcAlpha
    };

    static const NamedEnum<limitControls, 4> limitControlNames_;
    limitControls limit_;

    // Constructors

        //- Construct from patch and internal field
        alphaContactAngleFvPatchScalarField
        (
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&
        );

        //- Construct from patch, internal field and dictionary
        alphaContactAngleFvPatchScalarField
        (
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&,
            const dictionary&
        );

        //- Construct by mapping given alphaContactAngleFvPatchScalarField
        //  onto a new patch
        alphaContactAngleFvPatchScalarField
        (
            const alphaContactAngleFvPatchScalarField&,
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&,
            const fvPatchFieldMapper&
        );

        //- Construct as copy
        alphaContactAngleFvPatchScalarField
        (
            const alphaContactAngleFvPatchScalarField&
        );

        //- Construct as copy setting internal field reference
        alphaContactAngleFvPatchScalarField
        (
            const alphaContactAngleFvPatchScalarField&,
            const DimensionedField<scalar, volMesh>&
        );


    // Member functions

        //- Return the contact angle
        virtual tmp<scalarField> theta
        (
            const fvPatchVectorField& Up,
            const fvsPatchVectorField& nHat
        ) const = 0;

        //- Evaluate the patch field
        virtual void evaluate
        (
            const Pstream::commsTypes commsType=Pstream::commsTypes::blocking
        );

        //- Write
        virtual void write(Ostream&) const;
};


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

} // End namespace Foam

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

#endif

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