Drag model for non-spherical particles. More...

Inheritance diagram for NonSphereDragForce< CloudType >:

Collaboration diagram for NonSphereDragForce< CloudType >:

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

	NonSphereDragForce (CloudType &owner, const fvMesh &mesh, const dictionary &dict)
	Construct from mesh. More...

	NonSphereDragForce (const NonSphereDragForce< CloudType > &df)
	Construct copy. More...

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

virtual	~NonSphereDragForce ()
	Destructor. More...

virtual forceSuSp	calcCoupled (const typename CloudType::parcelType &p, const scalar dt, const scalar mass, const scalar Re, const scalar muc) const
	Calculate the non-coupled force. More...

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

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

	ParticleForce (CloudType &owner, const fvMesh &mesh, const dictionary &dict, const word &forceType, const bool readCoeffs)
	Construct from mesh. More...

	ParticleForce (const ParticleForce &pf)
	Construct copy. More...

virtual	~ParticleForce ()
	Destructor. More...

const CloudType &	owner () const
	Return const access to the cloud owner. More...

CloudType &	owner ()
	Return refernce to the cloud owner. More...

const fvMesh &	mesh () const
	Return the mesh database. More...

const dictionary &	coeffs () const
	Return the force coefficients dictionary. More...

virtual void	cacheFields (const bool store)
	Cache fields. More...

virtual forceSuSp	calcNonCoupled (const typename CloudType::parcelType &p, const scalar dt, const scalar mass, const scalar Re, const scalar muc) const
	Calculate the non-coupled force. More...

virtual scalar	massAdd (const typename CloudType::parcelType &p, const scalar mass) const
	Return the added mass. More...

Protected Member Functions
scalar	CdRe (const scalar Re) const
	Drag coefficient multiplied by Reynolds number. More...

Protected Attributes
scalar	phi_
	Ratio of surface of sphere having same volume as particle to. More...

scalar	a_

scalar	b_

scalar	c_

scalar	d_

Additional Inherited Members
Public Types inherited from ParticleForce< CloudType >
typedef VectorSpace< Vector< vector >, vector, 2 >	returnType
	Convenience typedef for return type. More...

Static Public Member Functions inherited from ParticleForce< CloudType >
static autoPtr< ParticleForce< CloudType > >	New (CloudType &owner, const fvMesh &mesh, const dictionary &dict, const word &forceType)
	Selector. More...

Detailed Description

template<class CloudType>
class Foam::NonSphereDragForce< CloudType >

Drag model for non-spherical particles.

Takes the form of

24.0/Re*(1.0 + a_*pow(Re, b_)) + Re*c_/(Re + d_);

Where a(phi), b(phi), c(phi) and d(phi) are model coefficients, with phi defined as:

area of sphere with same volume as particle phi = ——————————————- actual particle area

Equation used is Eqn (11) of reference below - good to within 2 to 4 % of RMS values from experiment.

H and L also give a simplified model with greater error compared to results from experiment - Eqn 12 - but since phi is presumed constant, it offers little benefit.

Reference:

    "Drag coefficient and terminal velocity of spherical and nonspherical
    particles"
    A. Haider and O. Levenspiel,
    Powder Technology
    Volume 58, Issue 1, May 1989, Pages 63-70

Definition at line 73 of file NonSphereDragForce.H.

Constructor & Destructor Documentation

NonSphereDragForce	(	CloudType &	owner,
		const fvMesh &	mesh,
		const dictionary &	dict
	)

Construct from mesh.

Definition at line 41 of file NonSphereDragForce.C.

References Foam::exit(), Foam::FatalError, and FatalErrorInFunction.

Referenced by NonSphereDragForce< CloudType >::CdRe().

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NonSphereDragForce ( const NonSphereDragForce< CloudType > & df )

Construct copy.

Definition at line 66 of file NonSphereDragForce.C.

~NonSphereDragForce ( )

virtual

Destructor.

Definition at line 82 of file NonSphereDragForce.C.

References NonSphereDragForce< CloudType >::calcCoupled().

Referenced by NonSphereDragForce< CloudType >::clone().

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Member Function Documentation

Foam::scalar CdRe ( const scalar Re ) const

protected

Drag coefficient multiplied by Reynolds number.

Definition at line 31 of file NonSphereDragForce.C.

References NonSphereDragForce< CloudType >::NonSphereDragForce(), and Foam::pow().

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TypeName ( "nonSphereDrag" )

Runtime type information.

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

inlinevirtual

Construct and return a clone.

Reimplemented from ParticleForce< CloudType >.

Definition at line 123 of file NonSphereDragForce.H.

References NonSphereDragForce< CloudType >::calcCoupled(), p, Foam::Re(), and NonSphereDragForce< CloudType >::~NonSphereDragForce().

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Foam::forceSuSp calcCoupled	(	const typename CloudType::parcelType &	p,
		const scalar	dt,
		const scalar	mass,
		const scalar	Re,
		const scalar	muc
	)		const

virtual

Calculate the non-coupled force.

Reimplemented from ParticleForce< CloudType >.

Definition at line 90 of file NonSphereDragForce.C.

References forceSuSp::Sp(), Foam::sqr(), and Foam::Zero.

Referenced by NonSphereDragForce< CloudType >::clone(), and NonSphereDragForce< CloudType >::~NonSphereDragForce().

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Member Data Documentation

scalar phi_

protected

Ratio of surface of sphere having same volume as particle to.

actual surface area of particle (0 < phi <= 1)

Definition at line 83 of file NonSphereDragForce.H.

scalar a_

protected

Definition at line 88 of file NonSphereDragForce.H.

scalar b_

protected

Definition at line 90 of file NonSphereDragForce.H.

scalar c_

protected

Definition at line 92 of file NonSphereDragForce.H.

scalar d_

protected

Definition at line 94 of file NonSphereDragForce.H.

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

src/lagrangian/intermediate/submodels/Kinematic/ParticleForces/Drag/NonSphereDrag/NonSphereDragForce.H
src/lagrangian/intermediate/submodels/Kinematic/ParticleForces/Drag/NonSphereDrag/NonSphereDragForce.C

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

template<class CloudType> class Foam::NonSphereDragForce< CloudType >

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation

template<class CloudType>
class Foam::NonSphereDragForce< CloudType >