RaviPetersen.C

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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-------------------------------------------------------------------------------
    Copyright (C) 2013-2017 OpenFOAM Foundation
-------------------------------------------------------------------------------
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
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
\*---------------------------------------------------------------------------*/
 
#include "RaviPetersen.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace laminarFlameSpeedModels
{
    defineTypeNameAndDebug(RaviPetersen, 0);
 
    addToRunTimeSelectionTable
    (
        laminarFlameSpeed,
        RaviPetersen,
        dictionary
    );
}
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::laminarFlameSpeedModels::RaviPetersen::RaviPetersen
(
    const dictionary& dict,
    const psiuReactionThermo& ct
)
:
    laminarFlameSpeed(dict, ct),
    coeffsDict_(dict.optionalSubDict(typeName + "Coeffs").subDict(fuel_)),
    pPoints_(coeffsDict_.lookup("pPoints")),
    EqRPoints_(coeffsDict_.lookup("EqRPoints")),
    alpha_(coeffsDict_.lookup("alpha")),
    beta_(coeffsDict_.lookup("beta")),
    TRef_(coeffsDict_.get<scalar>("TRef"))
{
    checkPointsMonotonicity("equivalenceRatio", EqRPoints_);
    checkPointsMonotonicity("pressure", pPoints_);
    checkCoefficientArrayShape("alpha", alpha_);
    checkCoefficientArrayShape("beta", beta_);
}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
Foam::laminarFlameSpeedModels::RaviPetersen::~RaviPetersen()
{}
 
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
void Foam::laminarFlameSpeedModels::RaviPetersen::checkPointsMonotonicity
(
    const word& name,
    const List<scalar>& x
) const
{
    for (label i = 1; i < x.size(); i ++)
    {
        if (x[i] <= x[i-1])
        {
            FatalIOErrorInFunction(coeffsDict_)
                << "Data points for the " << name
                << " do not increase monotonically" << nl
                << exit(FatalIOError);
        }
    }
}
 
 
void Foam::laminarFlameSpeedModels::RaviPetersen::checkCoefficientArrayShape
(
    const word& name,
    const List<List<List<scalar>>>& x
) const
{
    bool ok = true;
 
    ok &= x.size() == EqRPoints_.size() - 1;
 
    forAll(x, i)
    {
        ok &= x[i].size() == pPoints_.size();
 
        forAll(x[i], j)
        {
            ok &= x[i][j].size() == x[i][0].size();
        }
    }
 
    if (!ok)
    {
        FatalIOErrorInFunction(coeffsDict_)
            << "Inconsistent size of " << name << " coefficients array" << nl
            << exit(FatalIOError);
    }
}
 
 
inline bool Foam::laminarFlameSpeedModels::RaviPetersen::interval
(
    const List<scalar>& xPoints,
    const scalar x,
    label& xIndex,
    scalar& xXi,
    scalar& xLim
) const
{
    if (x < xPoints.first())
    {
        xIndex = 0;
        xXi = 0.0;
        xLim = xPoints.first();
        return false;
    }
 
    else if (x > xPoints.last())
    {
        xIndex = xPoints.size() - 2;
        xXi = 1.0;
        xLim = xPoints.last();
        return false;
    }
 
    for (xIndex = 0; x > xPoints[xIndex+1]; xIndex ++)
    {
        // increment xIndex until xPoints[xIndex] < x < xPoints[xIndex+1]
    }
 
    xXi = (x - xPoints[xIndex])/(xPoints[xIndex+1] - xPoints[xIndex]);
    xLim = x;
 
    return true;
}
 
 
inline Foam::scalar Foam::laminarFlameSpeedModels::RaviPetersen::polynomial
(
    const List<scalar>& coeffs,
    const scalar x
) const
{
    scalar xPow = 1.0;
    scalar y = 0.0;
    forAll(coeffs, i)
    {
        y += coeffs[i]*xPow;
        xPow *= x;
    }
    return y;
}
 
 
inline Foam::scalar Foam::laminarFlameSpeedModels::RaviPetersen::dPolynomial
(
    const List<scalar>& coeffs,
    const scalar x
) const
{
    scalar xPow = 1.0;
    scalar y = 0.0;
    for (label i = 1; i < coeffs.size(); i++)
    {
        y += i*coeffs[i]*xPow;
        xPow *= x;
    }
    return y;
}
 
 
inline Foam::scalar Foam::laminarFlameSpeedModels::RaviPetersen::THatPowB
(
    const label EqRIndex,
    const label pIndex,
    const scalar EqR,
    const scalar Tu
) const
{
    return pow
    (
        Tu/TRef_,
        polynomial(beta_[EqRIndex][pIndex],EqR)
    );
}
 
 
inline Foam::scalar
Foam::laminarFlameSpeedModels::RaviPetersen::correlationInRange
(
    const label EqRIndex,
    const label pIndex,
    const scalar EqR,
    const scalar Tu
) const
{
    // standard correlation
    return
        polynomial(alpha_[EqRIndex][pIndex],EqR)
       *THatPowB(EqRIndex, pIndex, EqR, Tu);
}
 
 
inline Foam::scalar
Foam::laminarFlameSpeedModels::RaviPetersen::correlationOutOfRange
(
    const label EqRIndex,
    const label pIndex,
    const scalar EqR,
    const scalar EqRLim,
    const scalar Tu
) const
{
    scalar A = polynomial(alpha_[EqRIndex][pIndex], EqRLim);
    scalar dA = dPolynomial(alpha_[EqRIndex][pIndex], EqRLim);
    scalar dB = dPolynomial(beta_[EqRIndex][pIndex], EqRLim);
    scalar TB = THatPowB(EqRIndex, pIndex, EqRLim, Tu);
 
    // linear extrapolation from the bounds of the correlation
    return max(TB*(A + (dA + A*log(Tu/TRef_)*dB)*(EqR - EqRLim)), 0.0);
}
 
 
inline Foam::scalar Foam::laminarFlameSpeedModels::RaviPetersen::speed
(
    const scalar EqR,
    const scalar p,
    const scalar Tu
) const
{
    scalar Su = 0, s;
 
    label EqRIndex, pIndex;
    scalar EqRXi, pXi;
    scalar EqRLim, pLim;
    bool EqRInRange;
 
    EqRInRange = interval(EqRPoints_, EqR, EqRIndex, EqRXi, EqRLim);
 
    interval(pPoints_, p, pIndex, pXi, pLim);
 
    for (label pI = 0; pI < 2; pI ++)
    {
        if (EqRInRange)
        {
            s = correlationInRange(EqRIndex, pIndex + pI, EqR, Tu);
        }
        else
        {
            s = correlationOutOfRange(EqRIndex, pIndex + pI, EqR, EqRLim, Tu);
        }
 
        Su += (1 - pXi)*s;
        pXi = 1 - pXi;
    }
 
    return Su;
}
 
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
Foam::tmp<Foam::volScalarField>
Foam::laminarFlameSpeedModels::RaviPetersen::operator()() const
{
    const volScalarField& p = psiuReactionThermo_.p();
    const volScalarField& Tu = psiuReactionThermo_.Tu();
 
    volScalarField EqR
    (
        IOobject
        (
            "EqR",
            p.time().timeName(),
            p.db(),
            IOobject::NO_READ,
            IOobject::NO_WRITE,
            false
        ),
        p.mesh(),
        dimensionedScalar(dimless, Zero)
    );
 
    if (psiuReactionThermo_.composition().contains("ft"))
    {
        const volScalarField& ft = psiuReactionThermo_.composition().Y("ft");
 
        EqR =
            dimensionedScalar
            (
                "stoichiometricAirFuelMassRatio", dimless, psiuReactionThermo_
            )*ft/max(1 - ft, SMALL);
    }
    else
    {
        EqR = equivalenceRatio_;
    }
 
    tmp<volScalarField> tSu0
    (
        new volScalarField
        (
            IOobject
            (
                "Su0",
                p.time().timeName(),
                p.db(),
                IOobject::NO_READ,
                IOobject::NO_WRITE,
                false
            ),
            p.mesh(),
            dimensionedScalar(dimVelocity, Zero)
        )
    );
 
    volScalarField& Su0 = tSu0.ref();
 
    forAll(Su0, celli)
    {
        Su0[celli] = speed(EqR[celli], p[celli], Tu[celli]);
    }
 
    return tSu0;
}
 
 
// ************************************************************************* //