Public Member Functions | List of all members
BirdCarreau Class Reference

Bird-Carreau generalised Newtonian viscosity model. More...

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Public Member Functions

 TypeName ("BirdCarreau")
 Runtime type information. More...
 
 BirdCarreau (const dictionary &viscosityProperties)
 Construct from components. More...
 
virtual ~BirdCarreau ()
 Destructor. More...
 
virtual bool read (const dictionary &viscosityProperties)
 Read transportProperties dictionary. More...
 
virtual tmp< volScalarField > nu (const volScalarField &nu0, const volScalarField &strainRate) const
 Return the laminar viscosity. More...
 
- Public Member Functions inherited from generalisedNewtonianViscosityModel
 TypeName ("generalisedNewtonianViscosityModel")
 Runtime type information. More...
 
 declareRunTimeSelectionTable (autoPtr, generalisedNewtonianViscosityModel, dictionary,(const dictionary &viscosityProperties),(viscosityProperties))
 
 generalisedNewtonianViscosityModel (const dictionary &viscosityProperties)
 Construct from components. More...
 
 generalisedNewtonianViscosityModel (const generalisedNewtonianViscosityModel &)
 Disallow default bitwise copy construction. More...
 
virtual ~generalisedNewtonianViscosityModel ()
 Destructor. More...
 
const dictionary & viscosityProperties () const
 Return the phase transport properties dictionary. More...
 
void operator= (const generalisedNewtonianViscosityModel &)=delete
 Disallow default bitwise assignment. More...
 

Additional Inherited Members

- Static Public Member Functions inherited from generalisedNewtonianViscosityModel
static autoPtr< generalisedNewtonianViscosityModel > New (const dictionary &viscosityProperties)
 Return a reference to the selected viscosity model. More...
 
- Protected Attributes inherited from generalisedNewtonianViscosityModel
dictionary viscosityProperties_
 

Detailed Description

Bird-Carreau generalised Newtonian viscosity model.

The Bird-Carreau-Yasuda form is also supported if the optional a coefficient is specified. a defaults to 2 for the Bird-Carreau model.

The strain rate coefficient can be specified either as the constant k or the critical stress level at the transition to shear thinning tauStar if tauStar is provided:

Kinematic viscosity [m^2/s]

\[ \nu = \nu_\infty\, + (\nu_0 - \nu_\infty)\, \left(1 + (k\gamma)^a \right)^{(n - 1)/a} \]

or

\[ \nu = \nu_\infty + (\nu_0 - \nu_\infty) \left(1 + (\frac{\nu_0\gamma}{\tau^*} )^a \right)^{(n - 1)/a} \]

Example specification for a polymer: 

     viscosityModel BirdCarreau;

     nuInf       0;
     tauStar     90;
     n           0.5;
Source files

Definition at line 85 of file BirdCarreau.H.

Constructor & Destructor Documentation

◆ BirdCarreau()

BirdCarreau ( const dictionary &  viscosityProperties)

Construct from components.

Definition at line 54 of file BirdCarreau.C.

References Foam::read(), and BirdCarreau::read().

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◆ ~BirdCarreau()

virtual ~BirdCarreau ( )
inlinevirtual

Destructor.

Definition at line 111 of file BirdCarreau.H.

References BirdCarreau::nu(), and BirdCarreau::read().

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Member Function Documentation

◆ TypeName()

TypeName ( "BirdCarreau"  )

Runtime type information.

◆ read()

bool read ( const dictionary &  viscosityProperties)
virtual

Read transportProperties dictionary.

Implements generalisedNewtonianViscosityModel.

Definition at line 73 of file BirdCarreau.C.

References Foam::dimless, dictionary::found(), dictionary::lookup(), dictionary::lookupOrDefault(), BirdCarreau::nu(), dictionary::optionalSubDict(), and generalisedNewtonianViscosityModel::read().

Referenced by BirdCarreau::BirdCarreau(), and BirdCarreau::~BirdCarreau().

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◆ nu()

Foam::tmp< Foam::volScalarField > nu ( const volScalarField &  nu0,
const volScalarField &  strainRate 
) const
virtual

Return the laminar viscosity.

Implements generalisedNewtonianViscosityModel.

Definition at line 108 of file BirdCarreau.C.

References Foam::pow().

Referenced by BirdCarreau::read(), and BirdCarreau::~BirdCarreau().

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