/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2008-2010 OpenCFD Ltd.
     \\/     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 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/>.

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

#include "wideBandDiffusiveRadiationMixedFvPatchScalarField.H"
#include <OpenFOAM/addToRunTimeSelectionTable.H>
#include <finiteVolume/fvPatchFieldMapper.H>
#include <finiteVolume/volFields.H>

#include <radiation/fvDOM.H>
#include <radiation/wideBandAbsorptionEmission.H>
#include <radiation/radiationConstants.H>
#include <OpenFOAM/mathematicalConstants.H>

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

Foam::radiation::wideBandDiffusiveRadiationMixedFvPatchScalarField::
wideBandDiffusiveRadiationMixedFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF
)
:
    mixedFvPatchScalarField(p, iF),
    TName_("undefinedT"),
    emissivity_(0.0)
{
    refValue() = 0.0;
    refGrad() = 0.0;
    valueFraction() = 1.0;
}


Foam::radiation::wideBandDiffusiveRadiationMixedFvPatchScalarField::
wideBandDiffusiveRadiationMixedFvPatchScalarField
(
    const wideBandDiffusiveRadiationMixedFvPatchScalarField& ptf,
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    mixedFvPatchScalarField(ptf, p, iF, mapper),
    TName_(ptf.TName_),
    emissivity_(ptf.emissivity_)
{}


Foam::radiation::wideBandDiffusiveRadiationMixedFvPatchScalarField::
wideBandDiffusiveRadiationMixedFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const dictionary& dict
)
:
    mixedFvPatchScalarField(p, iF),
    TName_(dict.lookup("T")),
    emissivity_(readScalar(dict.lookup("emissivity")))
{
    const scalarField& Tp =
        patch().lookupPatchField<volScalarField, scalar>(TName_);

    refValue() =
        emissivity_*4.0*radiation::sigmaSB.value()*pow4(Tp)
       /Foam::mathematicalConstant::pi;
    refGrad() = 0.0;

    if (dict.found("value"))
    {
        fvPatchScalarField::operator=
        (
            scalarField("value", dict, p.size())
        );
    }
    else
    {
        fvPatchScalarField::operator=(refValue());
    }
}


Foam::radiation::wideBandDiffusiveRadiationMixedFvPatchScalarField::
wideBandDiffusiveRadiationMixedFvPatchScalarField
(
    const wideBandDiffusiveRadiationMixedFvPatchScalarField& ptf
)
:
    mixedFvPatchScalarField(ptf),
    TName_(ptf.TName_),
    emissivity_(ptf.emissivity_)
{}


Foam::radiation::wideBandDiffusiveRadiationMixedFvPatchScalarField::
wideBandDiffusiveRadiationMixedFvPatchScalarField
(
    const wideBandDiffusiveRadiationMixedFvPatchScalarField& ptf,
    const DimensionedField<scalar, volMesh>& iF
)
:
    mixedFvPatchScalarField(ptf, iF),
    TName_(ptf.TName_),
    emissivity_(ptf.emissivity_)
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

void Foam::radiation::wideBandDiffusiveRadiationMixedFvPatchScalarField::
updateCoeffs()
{
    if (this->updated())
    {
        return;
    }

    const radiationModel& radiation =
        db().lookupObject<radiationModel>("radiationProperties");

    const fvDOM& dom(refCast<const fvDOM>(radiation));

    label rayId = -1;
    label lambdaId = -1;
    dom.setRayIdLambdaId(dimensionedInternalField().name(), rayId, lambdaId);

    const label patchI = patch().index();

    if (dom.nLambda() == 0)
    {
        FatalErrorIn
        (
            "Foam::radiation::"
            "wideBandDiffusiveRadiationMixedFvPatchScalarField::updateCoeffs"
        )   << " a non-grey boundary condition is used with a grey "
            << "absorption model" << nl << exit(FatalError);
    }

    scalarField& Iw = *this;
    vectorField n = patch().Sf()/patch().magSf();

    radiativeIntensityRay& ray =
        const_cast<radiativeIntensityRay&>(dom.IRay(rayId));

    ray.Qr().boundaryField()[patchI] += Iw*(n & ray.dAve());

    const scalarField Eb =
        dom.blackBody().bLambda(lambdaId).boundaryField()[patchI];

    forAll(Iw, faceI)
    {
        scalar Ir = 0.0;
        for (label rayI=0; rayI < dom.nRay(); rayI++)
        {
            const vector& d = dom.IRay(rayI).d();

            const scalarField& IFace =
                dom.IRay(rayI).ILambda(lambdaId).boundaryField()[patchI];

            if ((-n[faceI] & d) < 0.0) // qin into the wall
            {
                const vector& dAve = dom.IRay(rayI).dAve();
                Ir = Ir + IFace[faceI]*mag(n[faceI] & dAve);
            }
        }

        const vector& d = dom.IRay(rayId).d();

        if ((-n[faceI] & d) > 0.0)
        {
            // direction out of the wall
            refGrad()[faceI] = 0.0;
            valueFraction()[faceI] = 1.0;
            refValue()[faceI] =
                (
                    Ir*(1.0 - emissivity_)
                  + emissivity_*Eb[faceI]
                )
               /mathematicalConstant::pi;
        }
        else
        {
            // direction into the wall
            valueFraction()[faceI] = 0.0;
            refGrad()[faceI] = 0.0;
            refValue()[faceI] = 0.0; //not used
        }
    }

    mixedFvPatchScalarField::updateCoeffs();
}


void Foam::radiation::wideBandDiffusiveRadiationMixedFvPatchScalarField::write
(
    Ostream& os
) const
{
    fvPatchScalarField::write(os);
    os.writeKeyword("T") << TName_ << token::END_STATEMENT << nl;
    os.writeKeyword("emissivity") << emissivity_ << token::END_STATEMENT << nl;
    writeEntry("value", os);
}


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

namespace Foam
{
namespace radiation
{
    makePatchTypeField
    (
        fvPatchScalarField,
        wideBandDiffusiveRadiationMixedFvPatchScalarField
    );
}
}


// ************************ vim: set sw=4 sts=4 et: ************************ //
