Advective outflow boundary condition based on solving DDt(psi, U) = 0 at the boundary. More...

#include <finiteVolume/advectiveFvPatchField.H>

Detailed Description

template<class Type>
class Foam::advectiveFvPatchField< Type >

Advective outflow boundary condition based on solving DDt(psi, U) = 0 at the boundary.

The standard (Euler, backward, CrankNicholson) time schemes are supported. Additionally an optional mechanism to relax the value at the boundary to a specified far-field value is provided which is switched on by specifying the relaxation length-scale lInf and the far-field value fieldInf.

The flow/wave speed at the outlet is provided by the virtual function advectionSpeed() the default implementation of which requires the name of flux field a the outlet (phi) and optionally the density (rho) if the mass-flux rather than the volumetric-flux is given.

outlet
{
typeadvective;
phi phi;
// rho  rho; // Not needed, phi volumetric
// fieldInf 1e5; // Optional
// lInf 0.1; // Optional
}

The flow/wave speed at the outlet can be changed by deriving a specialised BC fron this class and overriding advectionSpeed() e.g. in waveTransmissiveFvPatchField the advectionSpeed() calculates and returns the flow-speed plus the acoustic wave speed creating an acoustic wave transmissive boundary condition.

Source files

Definition at line 78 of file advectiveFvPatchField.H.

Inheritance diagram for advectiveFvPatchField< Type >:

Collaboration diagram for advectiveFvPatchField< Type >:

List of all members.

Public Member Functions
	TypeName ("advective")
	Runtime type information.
	advectiveFvPatchField (const fvPatch &, const DimensionedField< Type, volMesh > &)
	Construct from patch and internal field.
	advectiveFvPatchField (const fvPatch &, const DimensionedField< Type, volMesh > &, const dictionary &)
	Construct from patch, internal field and dictionary.
	advectiveFvPatchField (const advectiveFvPatchField< Type > &, const fvPatch &, const DimensionedField< Type, volMesh > &, const fvPatchFieldMapper &)
	Construct by mapping given advectiveFvPatchField.
	advectiveFvPatchField (const advectiveFvPatchField &)
	Construct as copy.
virtual tmp< fvPatchField< Type > >	clone () const
	Construct and return a clone.
	advectiveFvPatchField (const advectiveFvPatchField &, const DimensionedField< Type, volMesh > &)
	Construct as copy setting internal field reference.
virtual tmp< fvPatchField< Type > >	clone (const DimensionedField< Type, volMesh > &iF) const
	Construct and return a clone setting internal field reference.
const Type &	fieldInf () const
	Return the field at infinity.
Type &	fieldInf ()
	Return reference to the field at infinity to allow adjustment.
scalar	lInf () const
	Return the relaxation length-scale.
scalar &	lInf ()
	Return reference to the relaxation length-scale.
virtual tmp< scalarField >	advectionSpeed () const
	Calculate and return the advection speed at the boundary.
virtual void	updateCoeffs ()
	Update the coefficients associated with the patch field.
virtual void	write (Ostream &) const
	Write.
Protected Attributes
word	phiName_
	Name of the flux transporting the field.
word	rhoName_
	Name of the density field used to normalise the mass flux.
Type	fieldInf_
	Field value of the far-field.
scalar	lInf_
	Relaxation length-scale.