/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | avalanche module
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2017 Matthias Rauter
-------------------------------------------------------------------------------
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::frictionModels::DarcyWeisbach

Description
    DarcyWeisbach / Chezy friction model:

    tau_b = Cf*rho*g*U^2

    Definition follows Delestre et al. (2013), dx.doi.org/10.1002/fld.3741

SourceFiles
    DarcyWeisbach.C

Author
    Matthias Rauter matthias@rauter.it

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

#ifndef DarcyWeisbach_H
#define DarcyWeisbach_H

#include "frictionModel.H"
#include "dimensionedScalar.H"
#include "volFields.H"
#include "IOdictionary.H"
#include "typeInfo.H"
#include "runTimeSelectionTables.H"
#include "dimensionedScalar.H"
#include "tmp.H"
#include "autoPtr.H"
#include "faMatrices.H"

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

namespace Foam
{
namespace frictionModels
{

/*---------------------------------------------------------------------------*\
                        Class DaryWeisbach Declaration
\*---------------------------------------------------------------------------*/

class DarcyWeisbach
:
    public frictionModel
{
    // Private data

        dimensionedScalar Cf_;

        dimensionedScalar g_;

public:

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


    // Constructors

        //- Construct from components
        DarcyWeisbach
        (
            const dictionary& frictionProperties,
            const areaVectorField& Us,
            const areaScalarField& h,
            const areaScalarField& p
        );


    //- Destructor
    virtual ~DarcyWeisbach() = default;


    // Member Functions

        //- Return explicit coefficients for the linear system of equations
        //- considering friction
        virtual const areaVectorField& tauSc() const;

        //- Return implicit coefficients for the linear system of equations
        //- considering friction
        virtual const areaScalarField& tauSp() const;


        //- Read the friction properties dictionary
        virtual bool read(const dictionary& frictionProperties);
};


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

} // End namespace frictionModels
} // End namespace Foam

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

#endif

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