FreeFOAM The Cross-Platform CFD Toolkit
Hosted by SourceForge:
Get FreeFOAM at SourceForge.net. Fast, secure and Free Open Source software downloads
Public Member Functions

DeardorffDiffStress Class Reference

Differential SGS Stress Equation Model for incompressible flows. More...

#include <incompressibleLESModels/DeardorffDiffStress.H>

Detailed Description

Differential SGS Stress Equation Model for incompressible flows.

The DSEM uses a model version of the full balance equation for the SGS stress tensor to simulate the behaviour of B. Thus, 

d/dt(B) + div(U*B) - div(nuSgs*grad(B))
=
P - c1*epsilon/k*B - 0.667*(1 - c1)*epsilon*I - c2*(P - 0.333*trP*I)

where

k = 0.5*tr(B),
epsilon = ce*k^3/2/delta,
epsilon/k = ce*k^1/2/delta
P = -(B'L + L'B)
nuSgs = ck*sqrt(k)*delta
nuEff = nuSgs + nu
Source files

Definition at line 71 of file DeardorffDiffStress.H.

Inheritance diagram for DeardorffDiffStress:
Collaboration diagram for DeardorffDiffStress:

List of all members.

Public Member Functions

 TypeName ("DeardorffDiffStress")
 Runtime type information.
 DeardorffDiffStress (const volVectorField &U, const surfaceScalarField &phi, transportModel &transport)
 Construct from components.
virtual  ~DeardorffDiffStress ()
 Destructor.
tmp< volScalarField >  DBEff () const
 Return the effective diffusivity for B.
virtual void  correct (const tmp< volTensorField > &gradU)
 Correct Eddy-Viscosity and related properties.
virtual bool  read ()
 Read LESProperties dictionary.

Constructor & Destructor Documentation

DeardorffDiffStress ( const volVectorField &   U,
const surfaceScalarField &   phi,
transportModel &   transport  
)

Construct from components.

Definition at line 55 of file DeardorffDiffStress.C.

References Foam::tr().

virtual ~DeardorffDiffStress (  ) [inline, virtual]

Destructor.

Definition at line 108 of file DeardorffDiffStress.H.

Member Function Documentation

TypeName ( "DeardorffDiffStress"    )

Runtime type information.

tmp<volScalarField> DBEff (  ) const [inline]

Return the effective diffusivity for B.

Definition at line 115 of file DeardorffDiffStress.H.

References incompressible::turbulenceModel::nu(), and GenSGSStress::nuSgs_.

Referenced by DeardorffDiffStress::correct().

void correct ( const tmp< volTensorField > &   gradU  ) [virtual]

Correct Eddy-Viscosity and related properties.

Reimplemented from incompressible::LESModel.

Definition at line 91 of file DeardorffDiffStress.C.

References GenSGSStress::B_, Foam::bound(), GenSGSStress::ce_, Foam::component(), GeometricField< Type, PatchField, GeoMesh >::component(), incompressible::LESModel::correct(), DeardorffDiffStress::DBEff(), Foam::fvm::ddt(), incompressible::LESModel::delta(), Foam::fvm::div(), forAll, Foam::I, incompressible::LESModel::k0(), Foam::fvm::laplacian(), Foam::magSqr(), Foam::max(), incompressible::LESModel::nuEff(), incompressible::turbulenceModel::phi(), fvMatrix< Type >::relax(), fvMatrix< Type >::solve(), Foam::fvm::Sp(), Foam::sqrt(), Foam::symm(), Foam::tr(), Foam::twoSymm(), SymmTensor< Cmpt >::XX, SymmTensor< Cmpt >::YY, and SymmTensor< Cmpt >::ZZ.

bool read (  ) [virtual]

Read LESProperties dictionary.

Reimplemented from GenSGSStress.

Definition at line 138 of file DeardorffDiffStress.C.

References incompressible::LESModel::coeffDict(), GenSGSStress::read(), and dimensioned< Type >::readIfPresent().

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