/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2010 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.

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

#include "nutSpalartAllmarasStandardWallFunctionFvPatchScalarField.H"
#include <incompressibleRASModels/RASModel.H>
#include <finiteVolume/fvPatchFieldMapper.H>
#include <finiteVolume/volFields.H>
#include <OpenFOAM/addToRunTimeSelectionTable.H>

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

namespace Foam
{
namespace incompressible
{
namespace RASModels
{

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

tmp<scalarField>
nutSpalartAllmarasStandardWallFunctionFvPatchScalarField::calcNut() const
{
    const label patchI = patch().index();

    const RASModel& rasModel = db().lookupObject<RASModel>("RASProperties");
    const fvPatchVectorField& Uw = rasModel.U().boundaryField()[patchI];
    const scalarField magUp = mag(Uw.patchInternalField() - Uw);
    const scalarField& nuw = rasModel.nu().boundaryField()[patchI];

    tmp<scalarField> tyPlus = calcYPlus(magUp);
    scalarField& yPlus = tyPlus();

    tmp<scalarField> tnutw(new scalarField(patch().size(), 0.0));
    scalarField& nutw = tnutw();

    forAll(yPlus, facei)
    {
        if (yPlus[facei] > yPlusLam_)
        {
            nutw[facei] =
                nuw[facei]*(yPlus[facei]*kappa_/log(E_*yPlus[facei]) - 1.0);
        }
    }

    return tnutw;
}


tmp<scalarField>
nutSpalartAllmarasStandardWallFunctionFvPatchScalarField::calcYPlus
(
    const scalarField& magUp
) const
{
    const label patchI = patch().index();

    const RASModel& rasModel = db().lookupObject<RASModel>("RASProperties");
    const scalarField& y = rasModel.y()[patchI];
    const scalarField& nuw = rasModel.nu().boundaryField()[patchI];

    tmp<scalarField> tyPlus(new scalarField(patch().size(), 0.0));
    scalarField& yPlus = tyPlus();

    forAll(yPlus, facei)
    {
        scalar kappaRe = kappa_*magUp[facei]*y[facei]/nuw[facei];

        scalar yp = yPlusLam_;
        scalar ryPlusLam = 1.0/yp;

        int iter = 0;
        scalar yPlusLast = 0.0;

        do
        {
            yPlusLast = yp;
            yp = (kappaRe + yp)/(1.0 + log(E_*yp));

        } while(mag(ryPlusLam*(yp - yPlusLast)) > 0.01 && ++iter < 10 );

        yPlus[facei] = max(0.0, yp);
    }

    return tyPlus;
}


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

nutSpalartAllmarasStandardWallFunctionFvPatchScalarField::
nutSpalartAllmarasStandardWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF
)
:
    nutWallFunctionFvPatchScalarField(p, iF)
{}


nutSpalartAllmarasStandardWallFunctionFvPatchScalarField::
nutSpalartAllmarasStandardWallFunctionFvPatchScalarField
(
    const nutSpalartAllmarasStandardWallFunctionFvPatchScalarField& ptf,
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    nutWallFunctionFvPatchScalarField(ptf, p, iF, mapper)
{}


nutSpalartAllmarasStandardWallFunctionFvPatchScalarField::
nutSpalartAllmarasStandardWallFunctionFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const dictionary& dict
)
:
    nutWallFunctionFvPatchScalarField(p, iF, dict)
{}


nutSpalartAllmarasStandardWallFunctionFvPatchScalarField::
nutSpalartAllmarasStandardWallFunctionFvPatchScalarField
(
    const nutSpalartAllmarasStandardWallFunctionFvPatchScalarField& sawfpsf
)
:
    nutWallFunctionFvPatchScalarField(sawfpsf)
{}


nutSpalartAllmarasStandardWallFunctionFvPatchScalarField::
nutSpalartAllmarasStandardWallFunctionFvPatchScalarField
(
    const nutSpalartAllmarasStandardWallFunctionFvPatchScalarField& sawfpsf,
    const DimensionedField<scalar, volMesh>& iF
)
:
    nutWallFunctionFvPatchScalarField(sawfpsf, iF)
{}


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

tmp<scalarField>
nutSpalartAllmarasStandardWallFunctionFvPatchScalarField::yPlus() const
{
    const label patchI = patch().index();
    const RASModel& rasModel = db().lookupObject<RASModel>("RASProperties");
    const fvPatchVectorField& Uw = rasModel.U().boundaryField()[patchI];
    const scalarField magUp = mag(Uw.patchInternalField() - Uw);

    return calcYPlus(magUp);
}


void nutSpalartAllmarasStandardWallFunctionFvPatchScalarField::write
(
    Ostream& os
) const
{
    fvPatchField<scalar>::write(os);
    writeLocalEntries(os);
    writeEntry("value", os);
}


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

makePatchTypeField
(
    fvPatchScalarField,
    nutSpalartAllmarasStandardWallFunctionFvPatchScalarField
);

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

} // End namespace RASModels
} // End namespace incompressible
} // End namespace Foam

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