semiPermeableBaffleMassFractionFvPatchScalarField.H

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    Copyright (C) 2017 OpenFOAM Foundation
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License
    This file is part of OpenFOAM.
 
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    the Free Software Foundation, either version 3 of the License, or
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    for more details.
 
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    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::semiPermeableBaffleMassFractionFvPatchScalarField
 
Group
    grpGenericBoundaryConditions
 
Description
    This is a mass-fraction boundary condition for a semi-permeable baffle.
 
    This condition models a baffle which is permeable to a some species and
    impermeable to others. It must be used in conjunction with the
    corresponding velocity condition,
    semiPermeableBaffleVelocityFvPatchVectorField.
 
    The mass flux of a species is calculated as a coefficient multiplied by the
    difference in mass fraction across the baffle.
        \f[
            \phi_{Yi} = c A (Y_i - Y_{i,n})
        \f]
        where
        \vartable
            \phi_{Yi} | flux of the permeable species [kg/s]
            c         | transfer coefficient [kg/m2/s]
            A         | patch face area [m2]
            Y_i       | mass fraction on the patch []
            Y_{i,n}   | mass fraction on the neighbour patch []
        \endvartable
 
    A species that the baffle is permable to will, therefore, have a
    coefficient greater than zero, whilst a species that does not transfer will
    have a coefficient equal to zero.
 
    This condition calculates the species flux. The fluxes are summed up by the
    velocity consition to generate the net mass transfer across the baffle.
    This mass-fraction condition then generates a corrective diffusive flux to
    ensure that the correct amounts of the permeable species are transferred.
 
Usage
    \table
        Property | Description            | Req'd? | Default
        c        | Transfer coefficient   | no     | 0
        phi      | Name of the flux field | no     | phi
    \endtable
 
See also
    Foam::semiPermeableBaffleVelocityFvPatchVectorField
 
SourceFiles
    semiPermeableBaffleMassFractionFvPatchScalarField.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef semiPermeableBaffleMassFractionFvPatchScalarField_H
#define semiPermeableBaffleMassFractionFvPatchScalarField_H
 
#include "mappedPatchBase.H"
#include "mixedFvPatchFields.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
      Class semiPermeableBaffleMassFractionFvPatchScalarField Declaration
\*---------------------------------------------------------------------------*/
 
class semiPermeableBaffleMassFractionFvPatchScalarField
:
    public mappedPatchBase,
    public mixedFvPatchScalarField
{
    // Private data
 
        //- Transfer coefficient
        const scalar c_;
 
        //- Name of the flux field
        const word phiName_;
 
 
public:
 
    //- Runtime type information
    TypeName("semiPermeableBaffleMassFraction");
 
 
    // Constructors
 
        //- Construct from patch and internal field
        semiPermeableBaffleMassFractionFvPatchScalarField
        (
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&
        );
 
        //- Construct from patch, internal field and dictionary
        semiPermeableBaffleMassFractionFvPatchScalarField
        (
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&,
            const dictionary&
        );
 
        //- Construct by mapping given fixedValueTypeFvPatchField
        //  onto a new patch
        semiPermeableBaffleMassFractionFvPatchScalarField
        (
            const semiPermeableBaffleMassFractionFvPatchScalarField&,
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&,
            const fvPatchFieldMapper&
        );
 
        //- Construct as copy
        semiPermeableBaffleMassFractionFvPatchScalarField
        (
            const semiPermeableBaffleMassFractionFvPatchScalarField&
        );
 
        //- Construct and return a clone
        virtual tmp<fvPatchScalarField> clone() const
        {
            return tmp<fvPatchScalarField>
            (
                new semiPermeableBaffleMassFractionFvPatchScalarField(*this)
            );
        }
 
        //- Construct as copy setting internal field reference
        semiPermeableBaffleMassFractionFvPatchScalarField
        (
            const semiPermeableBaffleMassFractionFvPatchScalarField&,
            const DimensionedField<scalar, volMesh>&
        );
 
        //- Construct and return a clone setting internal field reference
        virtual tmp<fvPatchScalarField> clone
        (
            const DimensionedField<scalar, volMesh>& iF
        ) const
        {
            return tmp<fvPatchScalarField>
            (
                new semiPermeableBaffleMassFractionFvPatchScalarField
                (
                    *this,
                    iF
                )
            );
        }
 
 
    // Member functions
 
        // Evaluation functions
 
            //- Return the flux of this species through the baffle
            tmp<scalarField> phiY() const;
 
            //- Update the coefficients associated with the patch field
            virtual void updateCoeffs();
 
 
        //- Write
        virtual void write(Ostream&) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 
#endif
 
// ************************************************************************* //