basic Class Reference

Basic sub-grid obstacle drag model. Details supplied by J Puttock 2/7/06. More...

Inheritance diagram for basic:

Collaboration diagram for basic:


Public Member Functions
	TypeName ("basic")
	Runtime type information.
	basic (const dictionary &PDRProperties, const compressible::RASModel &turbulence, const volScalarField &rho, const volVectorField &U, const surfaceScalarField &phi)
	Construct from components.
virtual	~basic ()
virtual tmp< volSymmTensorField >	Dcu () const
	Return the momentum drag coefficient.
virtual tmp< volScalarField >	Gk () const
	Return the momentum drag turbulence generation rate.
virtual bool	read (const dictionary &PDRProperties)
	Update properties from given dictionary.

Detailed Description

Basic sub-grid obstacle drag model. Details supplied by J Puttock 2/7/06.

Sub-grid drag term

The resistance term (force per unit of volume) is given by:

$R = -\frac{1}{2} \rho \vert \dwea{\vec{U}} \vert \dwea{\vec{U}}.D$

where:

$ D $ is the tensor field "CR" in $m^{-1}$

This is term is treated implicitly in UEqn.H

Sub-grid turbulence generation

The turbulence source term $G_{R}$ occurring in the $\kappa-\epsilon$ equations for the generation of turbulence due to interaction with unresolved obstacles :

$G_{R} = C_{s}\beta_{\nu} \mu_{eff} A_{w}^{2}(\dwea{\vec{U}}-\dwea{\vec{U}_{s}})^2 + \frac{1}{2} \rho \vert \dwea{\vec{U}} \vert \dwea{\vec{U}}.T.\dwea{\vec{U}}$

where:

$C_{s}$ = 1

$\beta_{\nu}$ is the volume porosity (file "betav").

$\mu_{eff}$ is the effective viscosity.

$A_{w}^{2}$ is the obstacle surface area per unit of volume (file "Aw").

$\dwea{\vec{U}_{s}}$ is the slip velocity and is considered $\frac{1}{2}. \dwea{\vec{U}}$ .

$ T $ is a tensor in the file CT.

The term $G_{R}$ is treated explicitly in the $\kappa-\epsilon$ Eqs in the PDRkEpsilon.C file.

Source files

Definition at line 91 of file basic.H.

Constructor & Destructor Documentation

basic	(	const dictionary &	PDRProperties,
		const compressible::RASModel &	turbulence,
		const volScalarField &	rho,
		const volVectorField &	U,
		const surfaceScalarField &	phi
	)

Construct from components.

virtual ~basic ( ) [virtual]

Member Function Documentation

TypeName ( "basic" )

Runtime type information.

virtual tmp<volSymmTensorField> Dcu ( ) const [virtual]

Return the momentum drag coefficient.

Implements PDRDragModel.

virtual tmp<volScalarField> Gk ( ) const [virtual]

Return the momentum drag turbulence generation rate.

Implements PDRDragModel.

virtual bool read ( const dictionary & PDRProperties ) [virtual]

Update properties from given dictionary.

Implements PDRDragModel.

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

applications/solvers/combustion/PDRFoam/PDRModels/dragModels/basic/basic.H

basic Class Reference

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation