| /*---------------------------------------------------------------------------*\ | |
| ========= | | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | |
| \\ / O peration | Website: https://openfoam.org | |
| \\ / A nd | Copyright (C) 2017-2026 OpenFOAM Foundation | |
| \\/ 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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| 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/>. | |
| Class | |
| Foam::reactionModels::EDC | |
| Description | |
| Eddy Dissipation Concept (EDC) turbulent reaction model. | |
| This model considers that the reaction occurs in the regions of the flow | |
| where the dissipation of turbulence kinetic energy takes place (fine | |
| structures). The mass fraction of the fine structures and the mean residence | |
| time are provided by an energy cascade model. | |
| There are many versions and developments of the EDC model, 4 of which are | |
| currently supported in this implementation: v1981, v1996, v2005 and | |
| v2016. The model variant is selected using the optional \c version entry in | |
| the \c EDC dictionary | |
| \verbatim | |
| EDC | |
| { | |
| version v2016; | |
| } | |
| \endverbatim | |
| The default version is \c v2005 if the \c version entry is not specified. | |
| Model versions and references: | |
| \verbatim | |
| Version v2005: | |
| Cgamma = 2.1377 | |
| Ctau = 0.4083 | |
| kappa = gammaL^exp1 / (1 - gammaL^exp2), | |
| where exp1 = 2, and exp2 = 2. | |
| Magnussen, B. F. (2005, June). | |
| The Eddy Dissipation Concept - | |
| A Bridge Between Science and Technology. | |
| In ECCOMAS thematic conference on computational combustion | |
| (pp. 21-24). | |
| Version v1981: | |
| Changes coefficients exp1 = 3 and exp2 = 3 | |
| Magnussen, B. (1981, January). | |
| On the structure of turbulence and a generalised | |
| eddy dissipation concept for chemical reaction in turbulent flow. | |
| In 19th Aerospace Sciences Meeting (p. 42). | |
| Version v1996: | |
| Changes coefficients exp1 = 2 and exp2 = 3 | |
| Gran, I. R., & Magnussen, B. F. (1996). | |
| A numerical study of a bluff-body stabilised diffusion flame. | |
| Part 2. Influence of combustion modeling and finite-rate chemistry. | |
| Combustion Science and Technology, 119(1-6), 191-217. | |
| Version v2016: | |
| Use local constants computed from the turbulent Da and Re numbers. | |
| Parente, A., Malik, M. R., Contino, F., Cuoci, A., & Dally, B. B. | |
| (2016). | |
| Extension of the Eddy Dissipation Concept for | |
| turbulence/chemistry interactions to MILD combustion. | |
| Fuel, 163, 98-111. | |
| \endverbatim | |
| SourceFiles | |
| EDC.C | |
| \*---------------------------------------------------------------------------*/ | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| namespace Foam | |
| { | |
| namespace reactionModels | |
| { | |
| //- EDC model versions | |
| enum class EDCversions | |
| { | |
| v1981, | |
| v1996, | |
| v2005, | |
| v2016 | |
| }; | |
| extern const NamedEnum<EDCversions, 4> EDCversionNames; | |
| extern const EDCversions EDCdefaultVersion; | |
| const scalar EDCexp1[] = {3, 2, 2, 2}; | |
| const scalar EDCexp2[] = {3, 3, 2, 2}; | |
| /*---------------------------------------------------------------------------*\ | |
| Class EDC Declaration | |
| \*---------------------------------------------------------------------------*/ | |
| class EDC | |
| : | |
| public reactionModel | |
| { | |
| // Private Data | |
| //- The selected model version | |
| EDCversions version_; | |
| //- Model constant | |
| scalar C1_; | |
| //- Model constant | |
| scalar C2_; | |
| //- Model constant | |
| scalar Cgamma_; | |
| //- Model constant | |
| scalar Ctau_; | |
| //- Model constant | |
| scalar exp1_; | |
| //- Model constant | |
| scalar exp2_; | |
| //- Mixing parameter | |
| volScalarField kappa_; | |
| //- Run chemistry correction on every outer iteration. Default true. | |
| bool outerCorrect_; | |
| //- The time index of the last correction | |
| label timeIndex_; | |
| //- Pointer to chemistry model | |
| autoPtr<chemistryModel> chemistryPtr_; | |
| public: | |
| //- Runtime type information | |
| TypeName("EDC"); | |
| // Constructors | |
| //- Construct from components | |
| EDC | |
| ( | |
| const word& modelType, | |
| const fluidMulticomponentThermo& type, | |
| const compressibleMomentumTransportModel& turb, | |
| const word& reactionProperties | |
| ); | |
| //- Disallow default bitwise copy construction | |
| EDC(const EDC&) = delete; | |
| //- Destructor | |
| virtual ~EDC(); | |
| // Member Functions | |
| //- Correct reaction rate | |
| virtual void correct(); | |
| //- Specie consumption rate field | |
| virtual tmp<volInternalScalarField> R(const label speciei) const; | |
| //- Specie consumption rate matrix | |
| virtual tmp<fvScalarMatrix> R(volScalarField& Y) const; | |
| //- Heat release rate [kg/m/s^3] | |
| virtual tmp<volInternalScalarField> Qdot() const; | |
| //- Update properties from given dictionary | |
| virtual bool read(); | |
| // Member Operators | |
| //- Disallow default bitwise assignment | |
| void operator=(const EDC&) = delete; | |
| }; | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| } // End namespace reactionModels | |
| } // End namespace Foam | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| // ************************************************************************* // | |