Base-class for all Xi models used by the b-Xi combustion model. See Technical Report SH/RE/01R for details on the PDR modelling. More...

#include <XiModel.H>

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Public Member Functions
	TypeName ("XiModel")
	Runtime type information.
	declareRunTimeSelectionTable (autoPtr, XiModel, dictionary,(const dictionary &XiProperties, const psiuReactionThermo &thermo, const compressible::RASModel &turbulence, const volScalarField &Su, const volScalarField &rho, const volScalarField &b, const surfaceScalarField &phi),(XiProperties, thermo, turbulence, Su, rho, b, phi))
	XiModel (const dictionary &XiProperties, const psiuReactionThermo &thermo, const compressible::RASModel &turbulence, const volScalarField &Su, const volScalarField &rho, const volScalarField &b, const surfaceScalarField &phi)
	Construct from components.
virtual	~XiModel ()
	Destructor.
virtual const volScalarField &	Xi () const
	Return the flame-wrinkling Xi.
virtual tmp< volScalarField >	Db () const
	Return the flame diffusivity.
virtual void	addXi (multivariateSurfaceInterpolationScheme< scalar >::fieldTable &)
	Add Xi to the multivariateSurfaceInterpolationScheme table.
virtual void	correct ()=0
	Correct the flame-wrinkling Xi.
virtual void	correct (const fv::convectionScheme< scalar > &)
	Correct the flame-wrinkling Xi using the given convection scheme.
virtual bool	read (const dictionary &XiProperties)=0
	Update properties from given dictionary.
virtual void	writeFields ()=0
	Write fields related to Xi model.

Static Public Member Functions
static autoPtr< XiModel >	New (const dictionary &XiProperties, const psiuReactionThermo &thermo, const compressible::RASModel &turbulence, const volScalarField &Su, const volScalarField &rho, const volScalarField &b, const surfaceScalarField &phi)
	Return a reference to the selected Xi model.

Protected Attributes
dictionary	XiModelCoeffs_
const psiuReactionThermo &	thermo_
const compressible::RASModel &	turbulence_
const volScalarField &	Su_
const volScalarField &	rho_
const volScalarField &	b_
const surfaceScalarField &	phi_
volScalarField	Xi_
	Flame wrinkling field.

Detailed Description

Base-class for all Xi models used by the b-Xi combustion model. See Technical Report SH/RE/01R for details on the PDR modelling.

Xi is given through an algebraic expression (algebraic.H), by solving a transport equation (transport.H) or a fixed value (fixed.H).

See report TR/HGW/10 for details on the Weller two equations model.

In the algebraic and transport methods $\Xi_{eq}$ is calculated in similar way. In the algebraic approach, $\Xi_{eq}$ is the value used in the $ b $ transport equation.

$\Xi_{eq}$ is calculated as follows:

$\Xi_{eq} = 1 + (1 + 2\Xi_{coeff}(0.5 - \dwea{b}))(\Xi^* - 1)$

where:

$\dwea{b}$ is the regress variable.

$\Xi_{coeff}$ is a model constant.

$\Xi^*$ is the total equilibrium wrinkling combining the effects of the flame inestability and turbulence interaction and is given by

$\‍[ \Xi^* = \frac {R}{R - G_\eta - G_{in}} \‍]$

where:

$G_\eta$ is the generation rate of wrinkling due to turbulence interaction.

$G_{in} = \kappa \rho_{u}/\rho_{b}$ is the generation rate due to the flame inestability.

By adding the removal rates of the two effects:

$\‍[ R = G_\eta \frac{\Xi_{\eta_{eq}}}{\Xi_{\eta_{eq}} - 1} + G_{in} \frac{\Xi_{{in}_{eq}}}{\Xi_{{in}_{eq}} - 1} \‍]$

where:

$ R $ is the total removal.

$G_\eta$ is a model constant.

$\Xi_{\eta_{eq}}$ is the flame wrinkling due to turbulence.

$\Xi_{{in}_{eq}}$ is the equilibrium level of the flame wrinkling generated by inestability. It is a constant (default 2.5).

Source files

Definition at line 106 of file XiModel.H.

Constructor & Destructor Documentation

◆ XiModel()

XiModel	(	const dictionary &	XiProperties,
		const psiuReactionThermo &	thermo,
		const compressible::RASModel &	turbulence,
		const volScalarField &	Su,
		const volScalarField &	rho,
		const volScalarField &	b,
		const surfaceScalarField &	phi )

Construct from components.

References b, phi, rho, and Foam::Su().

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◆ ~XiModel()

virtual ~XiModel ( )

virtual

Destructor.

Member Function Documentation

◆ TypeName()

TypeName ( "XiModel" )

Runtime type information.

◆ declareRunTimeSelectionTable()

declareRunTimeSelectionTable	(	autoPtr	,
		XiModel	,
		dictionary	,
		(const dictionary &XiProperties, const psiuReactionThermo &thermo, const compressible::RASModel &turbulence, const volScalarField &Su, const volScalarField &rho, const volScalarField &b, const surfaceScalarField &phi)	,
		(XiProperties, thermo, turbulence, Su, rho, b, phi)	)

References b, phi, rho, and Foam::Su().

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◆ New()

autoPtr< XiModel > New	(	const dictionary &	XiProperties,
		const psiuReactionThermo &	thermo,
		const compressible::RASModel &	turbulence,
		const volScalarField &	Su,
		const volScalarField &	rho,
		const volScalarField &	b,
		const surfaceScalarField &	phi )

static

Return a reference to the selected Xi model.

References b, phi, rho, and Foam::Su().

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◆ Xi()

virtual const volScalarField & Xi ( ) const

inlinevirtual

Return the flame-wrinkling Xi.

Definition at line 224 of file XiModel.H.

References Xi_.

◆ Db()

virtual tmp< volScalarField > Db ( ) const

inlinevirtual

Return the flame diffusivity.

Reimplemented in algebraic, and transport.

Definition at line 232 of file XiModel.H.

References turbulence_.

◆ addXi()

virtual void addXi ( multivariateSurfaceInterpolationScheme< scalar >::fieldTable & )

inlinevirtual

Add Xi to the multivariateSurfaceInterpolationScheme table.

if required

Reimplemented in transport.

Definition at line 242 of file XiModel.H.

◆ correct() [1/2]

virtual void correct ( )

pure virtual

Correct the flame-wrinkling Xi.

Implemented in algebraic, fixed, and transport.

Referenced by correct().

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◆ correct() [2/2]

virtual void correct ( const fv::convectionScheme< scalar > & )

inlinevirtual

Correct the flame-wrinkling Xi using the given convection scheme.

Reimplemented in transport.

Definition at line 256 of file XiModel.H.

References correct().

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◆ read()

virtual bool read ( const dictionary & XiProperties )

pure virtual

Update properties from given dictionary.

Implemented in algebraic, fixed, and transport.

◆ writeFields()

virtual void writeFields ( )

pure virtual

Write fields related to Xi model.

Implemented in algebraic, fixed, and transport.

Member Data Documentation

◆ XiModelCoeffs_

dictionary XiModelCoeffs_

protected

Definition at line 113 of file XiModel.H.

◆ thermo_

const psiuReactionThermo& thermo_

protected

Definition at line 115 of file XiModel.H.

◆ turbulence_

const compressible::RASModel& turbulence_

protected

Definition at line 116 of file XiModel.H.

Referenced by Db().

◆ Su_

const volScalarField& Su_

protected

Definition at line 117 of file XiModel.H.

◆ rho_

const volScalarField& rho_

protected

Definition at line 118 of file XiModel.H.

◆ b_

const volScalarField& b_

protected

Definition at line 119 of file XiModel.H.

◆ phi_

const surfaceScalarField& phi_

protected

Definition at line 120 of file XiModel.H.

◆ Xi_

volScalarField Xi_

protected

Flame wrinkling field.

Definition at line 125 of file XiModel.H.

Referenced by transport::addXi(), and Xi().

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

applications/solvers/combustion/PDRFoam/XiModels/XiModel/XiModel.H

Public Member Functions

Static Public Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ XiModel()

◆ ~XiModel()

Member Function Documentation

◆ TypeName()

◆ declareRunTimeSelectionTable()

◆ New()

◆ Xi()

◆ Db()

◆ addXi()

◆ correct() [1/2]

◆ correct() [2/2]

◆ read()

◆ writeFields()

Member Data Documentation

◆ XiModelCoeffs_

◆ thermo_

◆ turbulence_

◆ Su_

◆ rho_

◆ b_

◆ phi_

◆ Xi_