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

Inheritance diagram for BirdCarreau:

Collaboration diagram for BirdCarreau:

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

	BirdCarreau (const dictionary &viscosityProperties, const Foam::viscosity &viscosity, const volVectorField &U)
	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 strainRateViscosityModel
	TypeName ("strainRateViscosityModel")
	Runtime type information. More...

	strainRateViscosityModel (const dictionary &viscosityProperties, const viscosity &viscosity, const volVectorField &U)
	Construct from components. More...

	strainRateViscosityModel (const strainRateViscosityModel &)=delete
	Disallow default bitwise copy construction. More...

virtual	~strainRateViscosityModel ()
	Destructor. More...

virtual tmp< volScalarField >	nu () const
	Return the laminar viscosity. More...

virtual tmp< scalarField >	nu (const label patchi) const
	Return the laminar viscosity for patch. More...

virtual void	correct ()
	Correct the laminar viscosity. More...

void	operator= (const strainRateViscosityModel &)=delete
	Disallow default bitwise assignment. More...

Public Member Functions inherited from generalisedNewtonianViscosityModel
	TypeName ("generalisedNewtonianViscosityModel")
	Runtime type information. More...

	declareRunTimeSelectionTable (autoPtr, generalisedNewtonianViscosityModel, dictionary,(const dictionary &viscosityProperties, const viscosity &viscosity, const volVectorField &U),(viscosityProperties, viscosity, U))

	generalisedNewtonianViscosityModel (const dictionary &viscosityProperties, const viscosity &viscosity, const volVectorField &U)
	Construct from components. More...

	generalisedNewtonianViscosityModel (const generalisedNewtonianViscosityModel &)=delete
	Disallow default bitwise copy construction. More...

virtual	~generalisedNewtonianViscosityModel ()
	Destructor. More...

void	operator= (const generalisedNewtonianViscosityModel &)=delete
	Disallow default bitwise assignment. More...

Public Member Functions inherited from viscosity
	TypeName ("viscosity")
	Runtime type information. More...

	viscosity ()
	Construct. More...

	viscosity (const viscosity &)=delete
	Disallow default bitwise copy construction. More...

virtual	~viscosity ()
	Destructor. More...

void	operator= (const viscosity &)=delete
	Disallow default bitwise assignment. More...

Additional Inherited Members
Static Public Member Functions inherited from generalisedNewtonianViscosityModel
static autoPtr< generalisedNewtonianViscosityModel >	New (const dictionary &viscosityProperties, const viscosity &viscosity, const volVectorField &U)
	Return a reference to the selected viscosity model. More...

Protected Member Functions inherited from strainRateViscosityModel
virtual tmp< volScalarField >	strainRate () const
	Return the strain-rate obtained from the velocity field. More...

Protected Attributes inherited from generalisedNewtonianViscosityModel
const viscosity &	viscosity_
	Reference to the fluid Newtonian viscosity. More...

const volVectorField &	U_
	Reference to the velocity field. More...

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 coefficient applied to strain rate $\gamma$ 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 paint using the first form of the model:

     viscosityModel BirdCarreau;

     nuInf       1e-5;
     k           10;
     n           0.5;

Example specification for a polymer using the second form of the model:

     viscosityModel BirdCarreau;

     nuInf       0;
     tauStar     90;
     n           0.5;

Note the viscosity nu0 at zero strain rate is a physical property, generally specified in the physicalProperties file.

Source files

Definition at line 96 of file BirdCarreau.H.

Constructor & Destructor Documentation

◆ BirdCarreau()

BirdCarreau	(	const dictionary &	viscosityProperties,
		const Foam::viscosity &	viscosity,
		const volVectorField &	U
	)

Construct from components.

Definition at line 51 of file BirdCarreau.C.

References strainRateViscosityModel::correct(), and BirdCarreau::read().

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◆ ~BirdCarreau()

virtual ~BirdCarreau ( )

inlinevirtual

Destructor.

Definition at line 127 of file BirdCarreau.H.

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 dictionary::found(), dictionary::optionalSubDict(), generalisedNewtonianViscosityModel::read(), and dictionary::read().

Referenced by 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 strainRateViscosityModel.

Definition at line 103 of file BirdCarreau.C.

References Foam::pow().

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

src/MomentumTransportModels/momentumTransportModels/laminar/generalisedNewtonian/generalisedNewtonianViscosityModels/strainRateViscosityModels/BirdCarreau/BirdCarreau.H
src/MomentumTransportModels/momentumTransportModels/laminar/generalisedNewtonian/generalisedNewtonianViscosityModels/strainRateViscosityModels/BirdCarreau/BirdCarreau.C

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ BirdCarreau()

◆ ~BirdCarreau()

Member Function Documentation

◆ TypeName()

◆ read()

◆ nu()