220 lines
6.2 KiB
C++
220 lines
6.2 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | foam-extend: Open Source CFD
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\\ / O peration |
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\\ / A nd | For copyright notice see file Copyright
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of foam-extend.
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foam-extend is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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foam-extend is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with foam-extend. If not, see <http://www.gnu.org/licenses/>.
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Class
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Foam::laminarFlameSpeedModels::SCOPE
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Description
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Laminar flame speed obtained from the SCOPE correlation.
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Seven parameters are specified in terms of polynomial functions of
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stoichiometry. Two polynomials are fitted, covering different parts of the
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flammable range. If the mixture is outside the fitted range, linear
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interpolation is used between the extreme of the polynomio and the upper or
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lower flammable limit with the Markstein number constant.
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Variations of pressure and temperature from the reference values are taken
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into account through \f$ pexp \f$ and \f$ texp \f$
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The laminar burning velocity fitting polynomial is:
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\f$ Su = a_{0}(1+a_{1}x+K+..a_{i}x^{i}..+a_{6}x^{6}) (p/p_{ref})^{pexp}
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(T/T_{ref})^{texp} \f$
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where:
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\f$ a_{i} \f$ are the polinomial coefficients.
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\f$ pexp \f$ and \f$ texp \f$ are the pressure and temperature factors
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respectively.
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\f$ x \f$ is the equivalence ratio.
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\f$ T_{ref} \f$ and \f$ p_{ref} \f$ are the temperature and pressure
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references for the laminar burning velocity.
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SourceFiles
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SCOPELaminarFlameSpeed.C
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\*---------------------------------------------------------------------------*/
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#ifndef SCOPE_H
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#define SCOPE_H
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#include "laminarFlameSpeed.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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namespace laminarFlameSpeedModels
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{
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/*---------------------------------------------------------------------------*\
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Class SCOPE Declaration
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\*---------------------------------------------------------------------------*/
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class SCOPE
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:
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public laminarFlameSpeed
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{
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// Private Data
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class polynomial
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:
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public FixedList<scalar, 7>
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{
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public:
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//- Lower limit
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scalar ll;
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//- Upper polynomial limit
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scalar ul;
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//- Value at lower limit
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scalar llv;
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//- Value at upper limit
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scalar ulv;
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//- Changeover point from lower to upper polynomial
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scalar lu;
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//- Construct from dictionary
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polynomial(const dictionary& polyDict);
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};
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dictionary coeffsDict_;
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//- Lower flamability limit
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scalar LFL_;
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//- Upper flamability limit
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scalar UFL_;
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//- Lower Su polynomial
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polynomial SuPolyL_;
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//- Upper Su polynomial
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polynomial SuPolyU_;
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//- Temperature correction exponent
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scalar Texp_;
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//- Pressure correction exponent
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scalar pexp_;
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//- Lower Ma polynomial
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polynomial MaPolyL_;
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//- Upper Ma polynomial
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polynomial MaPolyU_;
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// Private member functions
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//- Polynomial evaluated from the given equivalence ratio
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// and polynomial coefficients
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static inline scalar polyPhi(scalar phi, const polynomial& a);
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//- Laminar flame speed evaluated from the given equivalence ratio
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// at the reference temperature and pressure
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inline scalar SuRef(scalar phi) const;
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//- Markstein evaluated from the given equivalence ratio
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inline scalar Ma(scalar phi) const;
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//- Laminar flame speed evaluated from the given equivalence ratio
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// corrected for temperature and pressure dependence
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inline scalar Su0pTphi(scalar p, scalar Tu, scalar phi) const;
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//- Laminar flame speed evaluated from the given uniform
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// equivalence ratio corrected for temperature and pressure dependence
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tmp<volScalarField> Su0pTphi
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(
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const volScalarField& p,
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const volScalarField& Tu,
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scalar phi
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) const;
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//- Laminar flame speed evaluated from the given equivalence ratio
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// distribution corrected for temperature and pressure dependence
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tmp<volScalarField> Su0pTphi
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(
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const volScalarField& p,
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const volScalarField& Tu,
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const volScalarField& phi
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) const;
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//- Return the Markstein number
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// evaluated from the given equivalence ratio
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tmp<volScalarField> Ma(const volScalarField& phi) const;
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//- Construct as copy (not implemented)
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SCOPE(const SCOPE&);
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void operator=(const SCOPE&);
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public:
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//- Runtime type information
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TypeName("SCOPE");
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// Constructors
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//- Construct from dictionary and hhuCombustionThermo
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SCOPE
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(
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const dictionary&,
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const hhuCombustionThermo&
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);
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// Destructor
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~SCOPE();
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// Member functions
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//- Return the Markstein number
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tmp<volScalarField> Ma() const;
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//- Return the laminar flame speed [m/s]
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tmp<volScalarField> operator()() const;
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};
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End laminarFlameSpeedModels
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} // End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************************************************************* //
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