Flame Surface Dennsity (FDS) combustion model. More...

Inheritance diagram for FSD< CombThermoType, ThermoType >:

Collaboration diagram for FSD< CombThermoType, ThermoType >:

[legend]

Public Member Functions
	TypeName ("FSD")
	Runtime type information. More...

	FSD (const word &modelType, const fvMesh &mesh, const word &phaseName)
	Construct from components. More...

virtual	~FSD ()

virtual void	correct ()
	Correct combustion rate. More...

virtual bool	read ()
	Update properties. More...

Public Member Functions inherited from singleStepCombustion< CombThermoType, ThermoType >
	singleStepCombustion (const word &modelType, const fvMesh &mesh, const word &phaseName)
	Construct from components. More...

virtual	~singleStepCombustion ()
	Destructor. More...

virtual tmp< fvScalarMatrix >	R (volScalarField &Y) const
	Fuel consumption rate matrix. More...

virtual tmp< volScalarField >	dQ () const
	Heat release rate calculated from fuel consumption rate matrix. More...

virtual tmp< volScalarField >	Sh () const
	Sensible enthalpy source term. More...

Private Member Functions
void	calculateSourceNorm ()
	Calculate the normalised fuel source term. More...

	FSD (const FSD &)
	Disallow copy construct. More...

void	operator= (const FSD &)
	Disallow default bitwise assignment. More...

Private Attributes
autoPtr< reactionRateFlameArea >	reactionRateFlameArea_
	Auto pointer to consumption speed per unit of flame area model. More...

volScalarField	ft_
	Mixture fraction. More...

dimensionedScalar	YFuelFuelStream_
	Fuel mass concentration on the fuel stream. More...

dimensionedScalar	YO2OxiStream_
	Oxygen mass concentration on the oxydizer stream. More...

scalar	Cv_
	Similarity constant for the sub-grid ft fluctuations. More...

scalar	C_
	Model constant. More...

scalar	ftMin_
	Lower flammability limit. More...

scalar	ftMax_
	Upper flammability limit. More...

scalar	ftDim_
	Dimension of the ft space. Used to integrate the beta-pdf. More...

scalar	ftVarMin_
	Minimum mixture freaction variance to calculate pdf. More...

Additional Inherited Members
Protected Attributes inherited from singleStepCombustion< CombThermoType, ThermoType >
singleStepReactingMixture< ThermoType > *	singleMixturePtr_
	Pointer to singleStepReactingMixture mixture. More...

volScalarField	wFuel_
	Fuel consumption rate. More...

bool	semiImplicit_
	Semi-implicit (true) or explicit (false) treatment. More...

Detailed Description

template<class CombThermoType, class ThermoType>
class Foam::combustionModels::FSD< CombThermoType, ThermoType >

Flame Surface Dennsity (FDS) combustion model.

The fuel source term is given by mgft*pc*omegaFuelBar.

where: mgft: filtered flame area. pc: probability of the combustion progress. omegaFuelBar: filtered consumption speed per unit of flame area.

pc is considered from the IFC solution. omegaFuelBar is calculated solving a relaxation equation which tends to omegaEq. This omegaEq is obtained from the flamelet solution for different strain rates and fit using a expential distribution.

The spacial distribution of the consumption speed (omega) is obtained also from a strained flamelet solution and it is assumed to have a guassian distribution.

If the grid resolution is not enough to resolve the flame, the consumption speed distribution is linearly thickened conserving the overall heat release.

If the turbulent fluctuation of the mixture fraction at the sub-grid level is large (>1e-04) then a beta pdf is used for filtering.

At the moment the flame area combustion model is only fit to work in a LES frame work. In RAS the subgrid fluctuation has to be solved by an extra transport equation.

Source files

FSD.H
FSD.C

Definition at line 80 of file FSD.H.

Constructor & Destructor Documentation

◆ FSD() [1/2]

FSD ( const FSD< CombThermoType, ThermoType > & )

private

Disallow copy construct.

◆ FSD() [2/2]

FSD	(	const word &	modelType,
		const fvMesh &	mesh,
		const word &	phaseName
	)

Construct from components.

Definition at line 41 of file FSD.C.

◆ ~FSD()

~FSD

virtual

Definition at line 89 of file FSD.C.

Member Function Documentation

◆ calculateSourceNorm()

void calculateSourceNorm

private

Calculate the normalised fuel source term.

Definition at line 96 of file FSD.C.

References Foam::constant::physicoChemical::b, Foam::constant::universal::c, delta, Foam::dimLength, Foam::dimless, Foam::fvc::div(), Foam::e, Foam::exp(), forAll, Foam::fvc::grad(), IOobject::groupName(), Foam::mag(), Foam::max(), mesh, Foam::min(), IOobject::NO_READ, IOobject::NO_WRITE, Foam::pow(), s(), Foam::constant::physicoChemical::sigma, Foam::sqr(), turbulence, and U.

Here is the call graph for this function:

◆ operator=()

void operator= ( const FSD< CombThermoType, ThermoType > & )

private

Disallow default bitwise assignment.

◆ TypeName()

TypeName ( "FSD< CombThermoType, ThermoType >" )

Runtime type information.

◆ correct()

void correct

virtual

Correct combustion rate.

Definition at line 333 of file FSD.C.

References Foam::dimLength, Foam::dimMass, Foam::dimTime, and Foam::pow3().

Here is the call graph for this function:

◆ read()

bool read

virtual

Update properties.

Reimplemented from singleStepCombustion< CombThermoType, ThermoType >.

Definition at line 346 of file FSD.C.

Field Documentation

◆ reactionRateFlameArea_

autoPtr<reactionRateFlameArea> reactionRateFlameArea_

private

Auto pointer to consumption speed per unit of flame area model.

Definition at line 87 of file FSD.H.

◆ ft_

volScalarField ft_

private

Mixture fraction.

Definition at line 90 of file FSD.H.

◆ YFuelFuelStream_

dimensionedScalar YFuelFuelStream_

private

Fuel mass concentration on the fuel stream.

Definition at line 93 of file FSD.H.

◆ YO2OxiStream_

dimensionedScalar YO2OxiStream_

private

Oxygen mass concentration on the oxydizer stream.

Definition at line 96 of file FSD.H.

◆ Cv_

scalar Cv_

private

Similarity constant for the sub-grid ft fluctuations.

Definition at line 99 of file FSD.H.

◆ C_

scalar C_

private

Model constant.

Definition at line 102 of file FSD.H.

◆ ftMin_

scalar ftMin_

private

Lower flammability limit.

Definition at line 105 of file FSD.H.

◆ ftMax_

scalar ftMax_

private

Upper flammability limit.

Definition at line 108 of file FSD.H.

◆ ftDim_

scalar ftDim_

private

Dimension of the ft space. Used to integrate the beta-pdf.

Definition at line 111 of file FSD.H.

◆ ftVarMin_

scalar ftVarMin_

private

Minimum mixture freaction variance to calculate pdf.

Definition at line 114 of file FSD.H.

The documentation for this class was generated from the following files:

src/combustionModels/FSD/FSD.H
src/combustionModels/FSD/FSD.C

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

template<class CombThermoType, class ThermoType> class Foam::combustionModels::FSD< CombThermoType, ThermoType >

Constructor & Destructor Documentation

◆ FSD() [1/2]

◆ FSD() [2/2]

◆ ~FSD()

Member Function Documentation

◆ calculateSourceNorm()

◆ operator=()

◆ TypeName()

◆ correct()

◆ read()

Field Documentation

◆ reactionRateFlameArea_

◆ ft_

◆ YFuelFuelStream_

◆ YO2OxiStream_

◆ Cv_

◆ C_

◆ ftMin_

◆ ftMax_

◆ ftDim_

◆ ftVarMin_

template<class CombThermoType, class ThermoType>
class Foam::combustionModels::FSD< CombThermoType, ThermoType >