Public Member Functions | List of all members
activeBaffleVelocityFvPatchVectorField Class Reference

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...

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Public Member Functions

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

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

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

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


Patch 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:

    myPatch
    {
        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 161 of file activeBaffleVelocityFvPatchVectorField.H.

Constructor & Destructor Documentation

Construct from patch and internal field.

Definition at line 36 of file activeBaffleVelocityFvPatchVectorField.C.

Referenced by activeBaffleVelocityFvPatchVectorField::activeBaffleVelocityFvPatchVectorField(), and activeBaffleVelocityFvPatchVectorField::clone().

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

Construct from patch, internal field and dictionary.

Definition at line 82 of file activeBaffleVelocityFvPatchVectorField.C.

References activeBaffleVelocityFvPatchVectorField::activeBaffleVelocityFvPatchVectorField().

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Construct by mapping given activeBaffleVelocityFvPatchVectorField.

onto a new patch

Definition at line 58 of file activeBaffleVelocityFvPatchVectorField.C.

References activeBaffleVelocityFvPatchVectorField::activeBaffleVelocityFvPatchVectorField().

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Construct as copy.

Definition at line 113 of file activeBaffleVelocityFvPatchVectorField.C.

References activeBaffleVelocityFvPatchVectorField::activeBaffleVelocityFvPatchVectorField().

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Construct as copy setting internal field reference.

Definition at line 134 of file activeBaffleVelocityFvPatchVectorField.C.

References activeBaffleVelocityFvPatchVectorField::autoMap().

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Member Function Documentation

TypeName ( "activeBaffleVelocity"  )

Runtime type information.

virtual tmp<fvPatchVectorField> clone ( ) const
inlinevirtual

Construct and return a clone.

Definition at line 244 of file activeBaffleVelocityFvPatchVectorField.H.

References activeBaffleVelocityFvPatchVectorField::activeBaffleVelocityFvPatchVectorField().

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virtual tmp<fvPatchVectorField> clone ( const DimensionedField< vector, volMesh > &  iF) const
inlinevirtual
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 157 of file activeBaffleVelocityFvPatchVectorField.C.

Referenced by activeBaffleVelocityFvPatchVectorField::activeBaffleVelocityFvPatchVectorField(), and activeBaffleVelocityFvPatchVectorField::clone().

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

Reverse map the given fvPatchField onto this fvPatchField.

Definition at line 186 of file activeBaffleVelocityFvPatchVectorField.C.

Referenced by activeBaffleVelocityFvPatchVectorField::clone().

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void updateCoeffs ( )
virtual

Update the coefficients associated with the patch field.

Definition at line 210 of file activeBaffleVelocityFvPatchVectorField.C.

Referenced by activeBaffleVelocityFvPatchVectorField::clone().

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void write ( Ostream os) const
virtual

Write.

Definition at line 292 of file activeBaffleVelocityFvPatchVectorField.C.

Referenced by activeBaffleVelocityFvPatchVectorField::clone().

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