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License
This file is part of OpenFOAM.
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under the terms of the GNU General Public License as published by
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(at your option) any later version.
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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
\*---------------------------------------------------------------------------*/
#ifndef EDC_H
#define EDC_H
#include "autoPtr.H"
#include "reactionModel.H"
#include "chemistryModel.H"
#include "NamedEnum.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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