This velocity boundary condition simulates the opening of a baffle due to local flow conditions, by merging the behaviours of wall and cyclic conditions. The baffle joins two mesh regions, where the open fraction determines the interpolation weights applied to each cyclic- and neighbour-patch contribution. More...

#include <activeBaffleVelocityFvPatchVectorField.H>

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Public Member Functions
	TypeName ("activeBaffleVelocity")
	Runtime type information.
	activeBaffleVelocityFvPatchVectorField (const fvPatch &, const DimensionedField< vector, volMesh > &)
	Construct from patch and internal field.
	activeBaffleVelocityFvPatchVectorField (const fvPatch &, const DimensionedField< vector, volMesh > &, const dictionary &)
	Construct from patch, internal field and dictionary.
	activeBaffleVelocityFvPatchVectorField (const activeBaffleVelocityFvPatchVectorField &, const fvPatch &, const DimensionedField< vector, volMesh > &, const fvPatchFieldMapper &)
	Construct by mapping given activeBaffleVelocityFvPatchVectorField.
	activeBaffleVelocityFvPatchVectorField (const activeBaffleVelocityFvPatchVectorField &)
	Construct as copy.
	activeBaffleVelocityFvPatchVectorField (const activeBaffleVelocityFvPatchVectorField &, const DimensionedField< vector, volMesh > &)
	Construct as copy setting internal field reference.
virtual tmp< fvPatchField< vector > >	clone () const
	Return a clone.
virtual tmp< fvPatchField< vector > >	clone (const DimensionedField< vector, volMesh > &iF) const
	Clone with an internal field reference.
virtual void	autoMap (const fvPatchFieldMapper &)
	Map (and resize as needed) from self given a mapping object.
virtual void	rmap (const fvPatchVectorField &, const labelList &)
	Reverse map the given fvPatchField onto this fvPatchField.
virtual void	updateCoeffs ()
	Update the coefficients associated with the patch field.
virtual void	write (Ostream &) const
	Write.

Detailed Description

This velocity boundary condition simulates the opening of a baffle due to local flow conditions, by merging the behaviours of wall and cyclic conditions. The baffle joins two mesh regions, where the open fraction determines the interpolation weights applied to each cyclic- and neighbour-patch contribution.

We determine whether the baffle is opening or closing from the sign of the net force across the baffle, from which the baffle open fraction is updated using:

$\‍[ x = x_{old} + sign(F_{net})\frac{dt}{DT} \‍]$

where

	=	baffle open fraction [0-1]
$x_{old}$	=	baffle open fraction on previous evaluation
	=	simulation time step
	=	time taken to open the baffle
$F_{net}$	=	net force across the baffle

The open fraction is then applied to scale the patch areas.

Usage

Property	Description	Required	Default value
`p`	pressure field name	no	p
`cyclicPatch`	cylclic patch name	yes
`orientation`	1 or -1 used to switch flow direction	yes
`openFraction`	current opatch open fraction [0-1]	yes
`openingTime`	time taken to open the baffle	yes
`maxOpenFractionDelta`	max open fraction change per timestep	yes

Example of the boundary condition specification:

    <patchName>
    {
        type            activeBaffleVelocity;
        p               p;
        cyclicPatch     cyclic1;
        orientation     1;
        openFraction    0.2;
        openingTime     5.0;
        maxOpenFractionDelta 0.1;
    }

See also: Foam::fixedValueFvPatchField Foam::cyclicFvPatchField

Source files

Definition at line 158 of file activeBaffleVelocityFvPatchVectorField.H.

Constructor & Destructor Documentation

◆ activeBaffleVelocityFvPatchVectorField() [1/5]

activeBaffleVelocityFvPatchVectorField	(	const fvPatch &	p,
		const DimensionedField< vector, volMesh > &	iF )

Construct from patch and internal field.

Definition at line 30 of file activeBaffleVelocityFvPatchVectorField.C.

References p.

Referenced by activeBaffleVelocityFvPatchVectorField(), activeBaffleVelocityFvPatchVectorField(), activeBaffleVelocityFvPatchVectorField(), and TypeName().

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◆ activeBaffleVelocityFvPatchVectorField() [2/5]

activeBaffleVelocityFvPatchVectorField	(	const fvPatch &	p,
		const DimensionedField< vector, volMesh > &	iF,
		const dictionary &	dict )

Construct from patch, internal field and dictionary.

Definition at line 76 of file activeBaffleVelocityFvPatchVectorField.C.

References dict, fvPatchField< vector >::operator=(), p, Foam::refCast(), and Foam::Zero.

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◆ activeBaffleVelocityFvPatchVectorField() [3/5]

activeBaffleVelocityFvPatchVectorField	(	const activeBaffleVelocityFvPatchVectorField &	ptf,
		const fvPatch &	p,
		const DimensionedField< vector, volMesh > &	iF,
		const fvPatchFieldMapper &	mapper )

Construct by mapping given activeBaffleVelocityFvPatchVectorField.

onto a new patch

Definition at line 52 of file activeBaffleVelocityFvPatchVectorField.C.

References activeBaffleVelocityFvPatchVectorField(), and p.

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◆ activeBaffleVelocityFvPatchVectorField() [4/5]

activeBaffleVelocityFvPatchVectorField ( const activeBaffleVelocityFvPatchVectorField & ptf )

Construct as copy.

Definition at line 108 of file activeBaffleVelocityFvPatchVectorField.C.

References activeBaffleVelocityFvPatchVectorField().

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◆ activeBaffleVelocityFvPatchVectorField() [5/5]

activeBaffleVelocityFvPatchVectorField	(	const activeBaffleVelocityFvPatchVectorField &	ptf,
		const DimensionedField< vector, volMesh > &	iF )

Construct as copy setting internal field reference.

Definition at line 129 of file activeBaffleVelocityFvPatchVectorField.C.

References activeBaffleVelocityFvPatchVectorField().

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Member Function Documentation

◆ TypeName()

TypeName ( "activeBaffleVelocity" )

Runtime type information.

References activeBaffleVelocityFvPatchVectorField().

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◆ clone() [1/2]

virtual tmp< fvPatchField< vector > > clone ( ) const

inlinevirtual

Return a clone.

Definition at line 286 of file activeBaffleVelocityFvPatchVectorField.H.

References fvPatchField< Type >::Clone().

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◆ clone() [2/2]

virtual tmp< fvPatchField< vector > > clone ( const DimensionedField< vector, volMesh > & iF ) const

inlinevirtual

Clone with an internal field reference.

Definition at line 294 of file activeBaffleVelocityFvPatchVectorField.H.

References fvPatchField< Type >::Clone().

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◆ autoMap()

void autoMap ( const fvPatchFieldMapper & m )

virtual

Map (and resize as needed) from self given a mapping object.

Note: cannot map field from cyclic patch anyway so just recalculate

Areas should be consistent when doing autoMap except in case of topo changes. Note: we don't want to use Sf here since triggers rebuilding of fvMesh::S() which will give problems when mapped (since already on new mesh)

Definition at line 153 of file activeBaffleVelocityFvPatchVectorField.C.

References Foam::refCast().

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◆ rmap()

void rmap	(	const fvPatchVectorField &	ptf,
		const labelList &	addr )

virtual

Reverse map the given fvPatchField onto this fvPatchField.

Definition at line 185 of file activeBaffleVelocityFvPatchVectorField.C.

References Foam::refCast().

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◆ updateCoeffs()

void updateCoeffs ( )

virtual

Update the coefficients associated with the patch field.

Definition at line 210 of file activeBaffleVelocityFvPatchVectorField.C.

References Foam::clamp(), e, Foam::endl(), polyPatch::faceCells(), forAll, Foam::Info, Foam::mag(), fvPatch::magSf(), Foam::min(), p, fvPatch::patch(), Foam::refCast(), fvPatch::Sf(), Foam::sign(), and timeIndex.

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◆ write()

void write ( Ostream & os ) const

virtual

Write.

Definition at line 288 of file activeBaffleVelocityFvPatchVectorField.C.

References os(), fvPatchField< Type >::write(), and fvPatchField< Type >::writeValueEntry().

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

src/finiteVolume/fields/fvPatchFields/derived/activeBaffleVelocity/activeBaffleVelocityFvPatchVectorField.H
src/finiteVolume/fields/fvPatchFields/derived/activeBaffleVelocity/activeBaffleVelocityFvPatchVectorField.C

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ activeBaffleVelocityFvPatchVectorField() [1/5]

◆ activeBaffleVelocityFvPatchVectorField() [2/5]

◆ activeBaffleVelocityFvPatchVectorField() [3/5]

◆ activeBaffleVelocityFvPatchVectorField() [4/5]

◆ activeBaffleVelocityFvPatchVectorField() [5/5]

Member Function Documentation

◆ TypeName()

◆ clone() [1/2]

◆ clone() [2/2]

◆ autoMap()

◆ rmap()

◆ updateCoeffs()

◆ write()