/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright held by original author
     \\/     M anipulation  |
-------------------------------------------------------------------------------
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 2 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, write to the Free Software Foundation,
    Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

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

#include "sigmaRadial.H"
#include "addToRunTimeSelectionTable.H"

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

namespace Foam
{
namespace extrudeModels
{

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

defineTypeNameAndDebug(sigmaRadial, 0);

addToRunTimeSelectionTable(extrudeModel, sigmaRadial, dictionary);


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

sigmaRadial::sigmaRadial(const dictionary& dict)
:
    extrudeModel(typeName, dict),
    RTbyg_(readScalar(coeffDict_.lookup("RTbyg"))),
    pRef_(readScalar(coeffDict_.lookup("pRef"))),
    pStrat_(readScalar(coeffDict_.lookup("pStrat")))
{}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

sigmaRadial::~sigmaRadial()
{}


// * * * * * * * * * * * * * * * * Operators * * * * * * * * * * * * * * * * //

point sigmaRadial::operator()
(
    const point& surfacePoint,
    const vector& surfaceNormal,
    const label layer
) const
{
    // radius of the surface
    scalar rs = mag(surfacePoint);
    vector rsHat = surfacePoint/rs;

    scalar p = pRef_ - layer*(pRef_ - pStrat_)/nLayers_;
    scalar r = rs - RTbyg_*log(p/pRef_);

    return r*rsHat;
}


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

} // End namespace extrudeModels
} // End namespace Foam

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