Public Member Functions | List of all members
Lun Class Reference

Inter-particle stress model of Lun et al. More...

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Public Member Functions

 TypeName ("Lun")
 Runtime type information. More...
 
 Lun (const dictionary &dict)
 Constructors. More...
 
 Lun (const Lun &hc)
 Construct copy. More...
 
virtual autoPtr< ParticleStressModelclone () const
 Clone. More...
 
virtual ~Lun ()
 Destructor. More...
 
tmp< Field< scalar > > tau (const Field< scalar > &alpha, const Field< scalar > &rho, const Field< scalar > &uRms) const
 Member Functions. More...
 
tmp< Field< scalar > > dTaudTheta (const Field< scalar > &alpha, const Field< scalar > &rho, const Field< scalar > &uRms) const
 Collision stress derivaive w.r.t. the volume fraction. More...
 
- Public Member Functions inherited from ParticleStressModel
 TypeName ("particleStressModel")
 Runtime type information. More...
 
 declareRunTimeSelectionTable (autoPtr, ParticleStressModel, dictionary,(const dictionary &dict),(dict))
 Declare runtime constructor selection table. More...
 
 ParticleStressModel (const dictionary &dict)
 Constructors. More...
 
 ParticleStressModel (const ParticleStressModel &sm)
 Construct a copy. More...
 
virtual ~ParticleStressModel ()
 Destructor. More...
 
scalar alphaPacked () const
 Member Functions. More...
 
tmp< FieldField< Field, scalar > > tau (const FieldField< Field, scalar > &alpha, const FieldField< Field, scalar > &rho, const FieldField< Field, scalar > &uRms) const
 Collision stress using FieldFields. More...
 

Additional Inherited Members

- Static Public Member Functions inherited from ParticleStressModel
static autoPtr< ParticleStressModelNew (const dictionary &dict)
 Selector. More...
 
- Protected Attributes inherited from ParticleStressModel
scalar alphaPacked_
 Close pack volume fraction. More...
 

Detailed Description

Inter-particle stress model of Lun et al.

The stress value takes the following form:

\[ \left( \alpha \rho + \alpha^2 \rho (1 + e) \frac{3}{5} \left( 1 - \left( \frac{\alpha}{\alpha_{pack}} \right)^\frac{1}{3} \right) \right) \frac{1}{3} \sigma^2 \]

Here, $\alpha$ is the volume fraction of the dispersed phase, $\rho$ is the density of the dispersed phase, $e$ is a coefficient of restitution, and $\sigma$ is the RMS velocity fluctuation.

Reference:

    "Kinetic theories for granular flow: inelastic particles in Couette
    flow and slightly inelastic particles in a general flowfield"
    C Lun, S Savage, G Jeffrey, N Chepurniy
    Journal of Fluid Mechanics
    Volume 140, Pages 223-256, 1984
Source files

Definition at line 69 of file Lun.H.

Constructor & Destructor Documentation

Lun ( const dictionary dict)

Constructors.

Construct from components

Definition at line 50 of file Lun.C.

Referenced by Lun::clone().

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Lun ( const Lun hc)

Construct copy.

Definition at line 61 of file Lun.C.

~Lun ( )
virtual

Destructor.

Definition at line 73 of file Lun.C.

References Lun::tau().

Referenced by Lun::clone().

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Member Function Documentation

TypeName ( "Lun"  )

Runtime type information.

virtual autoPtr<ParticleStressModel> clone ( ) const
inlinevirtual

Clone.

Implements ParticleStressModel.

Definition at line 97 of file Lun.H.

References Foam::constant::atomic::alpha, Lun::dTaudTheta(), Lun::Lun(), rho, Lun::tau(), and Lun::~Lun().

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Foam::tmp< Foam::Field< Foam::scalar > > tau ( const Field< scalar > &  alpha,
const Field< scalar > &  rho,
const Field< scalar > &  uRms 
) const
virtual

Member Functions.

Collision stress

Implements ParticleStressModel.

Definition at line 81 of file Lun.C.

References Lun::dTaudTheta(), Foam::max(), and Foam::pow().

Referenced by Lun::clone(), and Lun::~Lun().

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Foam::tmp< Foam::Field< Foam::scalar > > dTaudTheta ( const Field< scalar > &  alpha,
const Field< scalar > &  rho,
const Field< scalar > &  uRms 
) const
virtual

Collision stress derivaive w.r.t. the volume fraction.

Implements ParticleStressModel.

Definition at line 105 of file Lun.C.

References notImplemented.

Referenced by Lun::clone(), and Lun::tau().

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