/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2007-2019 PCOpt/NTUA
    Copyright (C) 2013-2019 FOSS GP
    Copyright (C) 2019 OpenCFD Ltd.
-------------------------------------------------------------------------------
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.

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    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
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Class
    Foam::linearUpwindNormal

Description
    linearUpwindNormal interpolation scheme class derived from upwind and
    returns upwind weighting factors and also applies a gradient-based
    explicit correction. The magnitude of the correcting gradient is equal to 1

SourceFiles
    linearUpwindNormal.C

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

#ifndef linearUpwindNormal_H
#define linearUpwindNormal_H

#include "upwind.H"
#include "gaussGrad.H"

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

namespace Foam
{

/*---------------------------------------------------------------------------*\
                      Class linearUpwindNormal Declaration
\*---------------------------------------------------------------------------*/

template<class Type>
class linearUpwindNormal
:
    public upwind<Type>
{
    // Private Data

        word gradSchemeName_;
        tmp<fv::gradScheme<Type>> gradScheme_;


    // Private Member Functions

        //- No copy construct
        linearUpwindNormal(const linearUpwindNormal&);

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


public:

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


    // Constructors

        //- Construct from faceFlux
        linearUpwindNormal
        (
            const fvMesh& mesh,
            const surfaceScalarField& faceFlux
        )
        :
            upwind<Type>(mesh, faceFlux),
            gradSchemeName_("grad"),
            gradScheme_
            (
                new fv::gaussGrad<Type>(mesh)
            )
        {}

        //- Construct from Istream.
        //  The name of the flux field is read from the Istream and looked-up
        //  from the mesh objectRegistry
        linearUpwindNormal
        (
            const fvMesh& mesh,
            Istream& schemeData
        )
        :
            upwind<Type>(mesh, schemeData),
            gradSchemeName_(schemeData),
            gradScheme_
            (
                fv::gradScheme<Type>::New
                (
                    mesh,
                    mesh.gradScheme(gradSchemeName_)
                )
            )
        {}

        //- Construct from faceFlux and Istream
        linearUpwindNormal
        (
            const fvMesh& mesh,
            const surfaceScalarField& faceFlux,
            Istream& schemeData
        )
        :
            upwind<Type>(mesh, faceFlux, schemeData),
            gradSchemeName_(schemeData),
            gradScheme_
            (
                fv::gradScheme<Type>::New
                (
                    mesh,
                    mesh.gradScheme(gradSchemeName_)
                )
            )
        {}


    // Member Functions

        //- Return true if this scheme uses an explicit correction
        virtual bool corrected() const
        {
            return true;
        }

        //- Return the explicit correction to the face-interpolate
        virtual tmp<GeometricField<Type, fvsPatchField, surfaceMesh>>
        correction
        (
            const GeometricField<Type, fvPatchField, volMesh>&
        ) const;

};


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

} // End namespace Foam

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

#endif

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