Stochastic return-to-isotropy model. More...

Inheritance diagram for Stochastic< CloudType >:

Collaboration diagram for Stochastic< CloudType >:

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

	Stochastic (const dictionary &dict, CloudType &owner)
	Construct from components. More...

	Stochastic (const Stochastic< CloudType > &cm)
	Construct copy. More...

virtual autoPtr< IsotropyModel< CloudType > >	clone () const
	Construct and return a clone. More...

virtual	~Stochastic ()
	Destructor. More...

virtual void	calculate ()
	Member Functions. More...

Public Member Functions inherited from IsotropyModel< CloudType >
	TypeName ("isotropyModel")
	Runtime type information. More...

	declareRunTimeSelectionTable (autoPtr, IsotropyModel, dictionary,(const dictionary &dict, CloudType &owner),(dict, owner))
	Declare runtime constructor selection table. More...

	IsotropyModel (CloudType &owner)
	Construct null from owner. More...

	IsotropyModel (const dictionary &dict, CloudType &owner, const word &type)
	Construct from components. More...

	IsotropyModel (const IsotropyModel< CloudType > &cm)
	Construct a copy. More...

virtual autoPtr< IsotropyModel< CloudType > >	clone () const=0
	Construct and return a clone. More...

virtual	~IsotropyModel ()
	Destructor. More...

Private Member Functions
scalar	sampleGauss ()
	Sample a gaussian distribution using the Box-Muller method. More...

Additional Inherited Members
Static Public Member Functions inherited from IsotropyModel< CloudType >
static autoPtr< IsotropyModel< CloudType > >	New (const dictionary &dict, CloudType &owner)
	Selector. More...

Protected Attributes inherited from IsotropyModel< CloudType >
autoPtr< TimeScaleModel >	timeScaleModel_
	Time scale model. More...

Detailed Description

template<class CloudType>
class Foam::IsotropyModels::Stochastic< CloudType >

Stochastic return-to-isotropy model.

Particle velocities are modified by sampling a gaussian-plus-delta distribution, which depends on a time-scale. This randomises some particle velocities whilst leaving others unchanged. The lower the value of the time-scale, the greater the proportion of particle velocities affected.

A correction step is performed at the end to ensure that the model conserves both momentum and granular temperature.

Reference:

    "Inclusion of collisional return-to-isotropy in the MP-PIC method"
    P O'Rourke and D Snider
    Chemical Engineering Science
    Volume 80, Issue 0, Pages 39-54, December 2012

Source files

Definition at line 67 of file Stochastic.H.

Constructor & Destructor Documentation

◆ Stochastic() [1/2]

Stochastic	(	const dictionary &	dict,
		CloudType &	owner
	)

Construct from components.

Definition at line 32 of file Stochastic.C.

◆ Stochastic() [2/2]

Stochastic ( const Stochastic< CloudType > & cm )

Construct copy.

Definition at line 43 of file Stochastic.C.

◆ ~Stochastic()

~Stochastic

virtual

Destructor.

Definition at line 54 of file Stochastic.C.

Member Function Documentation

◆ sampleGauss()

Foam::scalar sampleGauss

private

Sample a gaussian distribution using the Box-Muller method.

Definition at line 61 of file Stochastic.C.

References f(), Foam::log(), rndGen(), DSMCCloud< ParcelType >::rndGen(), Foam::sqrt(), x, and y.

Here is the call graph for this function:

◆ TypeName()

TypeName ( "stochastic" )

Runtime type information.

◆ clone()

virtual autoPtr<IsotropyModel<CloudType> > clone ( ) const

inlinevirtual

Construct and return a clone.

Definition at line 93 of file Stochastic.H.

◆ calculate()

void calculate

virtual

Member Functions.

Calculate velocities

Implements IsotropyModel< CloudType >.

Definition at line 97 of file Stochastic.C.

References AveragingMethod::add(), AveragingMethod::average(), dict, Foam::exp(), forAllIter, AveragingMethod::interpolate(), Foam::magSqr(), Foam::max(), mesh, DSMCCloud< ParcelType >::mesh(), Foam::name(), p, rndGen(), DSMCCloud< ParcelType >::rndGen(), Foam::sqrt(), timeName, and x.