diffusionMulticomponent.H

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License
    This file is part of OpenFOAM.
 
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    the Free Software Foundation, either version 3 of the License, or
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Class
    Foam::combustionModels::diffusionMulticomponent
 
Description
 
    Diffusion based turbulent combustion model for multicomponent species.
 
    The model calculates the laminar finite rate source terms based on
    the kinetic for each reaction in order to begin the combustion and
    evaluates the minimum between this and the cross diffusion rate term
    defined as D*prob*muEff*mag(grad(Yi)*grad(Yj)) if laminarIgn is true.
 
    where:
 
    D :     is a model dynamic constant defined as C*f02 where:
            C is a model constant
            f02 = 1  + sqr(O2/oxidantRes), oxidantRes is an user input
 
    muEff : is the effective turbulent viscosity
    prob :  is a normalized Gaussian shaped distribution around the stoichiometric
            value of each reaction. The distribtion is controled by 'sigma'
            for standard deviation and ftCorr for correction of the stoichiometric
            value.
 
    In the combustion properties dictionary:
 
    diffusionMulticomponentCoeffs
    {
        Ci          (1.0 1.0);      // Default to 1
        fuels       (CH4 CO);
        oxidants    (O2 O2);
        YoxStream   (0.23 0.23);    // Default to 0.23
        YfStream    (1.0 1.0);      // Default to 1.0
        sigma       (0.02 0.02);    // Default to 0.02
        oxidantRes  (0.025 0.005);
        ftCorr      (0.0 0.0);      // Default to 0.0
        laminarIgn  false;          // Default false
    }
 
 
SourceFiles
    diffusionMulticomponent.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef diffusionMulticomponent_H
#define diffusionMulticomponent_H
 
#include "scalarList.H"
#include "tmp.H"
#include "Reaction.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace combustionModels
{
 
/*---------------------------------------------------------------------------*\
                    Class diffusionMulticomponent Declaration
\*---------------------------------------------------------------------------*/
 
template<class CombThermoType, class ThermoType>
class diffusionMulticomponent
:
    public CombThermoType
{
    // Private data
 
        //- Reactions
        const PtrList<Reaction<ThermoType> >& reactions_;
 
        //- Thermodynamic data of the species
        const PtrList<ThermoType>& specieThermo_;
 
        //- Pointer list of source terms
        PtrList<volScalarField> RijPtr_;
 
        //- Model constants
        scalarList Ci_;
 
        //- List of fuels for each reaction
        wordList fuelNames_;
 
        //- List of oxidants for each reaction
        wordList oxidantNames_;
 
        //- Heat of combustion [J/Kg]
        scalarList qFuel_;
 
        //- Stoichiometric air-fuel mass ratio
        scalarList stoicRatio_;
 
        //- Stoichiometric oxygen-fuel mass ratio
        scalarList s_;
 
        //- Oxydaser sream mass concentrations
        scalarList YoxStream_;
 
        //- Fuel stream mass concentrations
        scalarList YfStream_;
 
        //- Mean distribution for gaussian probabililty
        scalarList sigma_;
 
        //- Residual oxydaser
        scalarList oxidantRes_;
 
        //- ft stochiometric correction
        scalarList ftCorr_;
 
        //- Relaxatnio factor on total source
        scalar alpha_;
 
        //- Switch on to laminar combustion for ignition
        bool laminarIgn_;
 
 
    // Private Member Functions
 
        //- Return the chemical time scale
        tmp<volScalarField> tc() const;
 
        //- Initialize
        void init();
 
        //- Disallow copy construct
        diffusionMulticomponent(const diffusionMulticomponent&);
 
        //- Disallow default bitwise assignment
        void operator=(const diffusionMulticomponent&);
 
 
public:
 
    //- Runtime type information
    TypeName("diffusionMulticomponent");
 
 
    // Constructors
 
        //- Construct from components
        diffusionMulticomponent
        (
            const word& modelType,
            const fvMesh& mesh,
            const word& phaseName
        );
 
 
    //- Destructor
    virtual ~diffusionMulticomponent();
 
 
    // Member Functions
 
        // Evolution
 
            //- Correct combustion rate
            virtual void correct();
 
            //- Fuel consumption rate matrix.
            virtual tmp<fvScalarMatrix> R(volScalarField& Y) const;
 
            //- Heat release rate calculated from fuel consumption rate matrix
            virtual tmp<volScalarField> dQ() const;
 
            //-  Return source for enthalpy equation [kg/m/s3]
            virtual tmp<volScalarField> Sh() const;
 
 
    // IO
 
            //- Update properties from given dictionary
            virtual bool read();
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace combustionModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
#   include "diffusionMulticomponent.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //