activePressureForceBaffleVelocityFvPatchVectorField Class Reference

This boundary condition is applied to the flow velocity, to simulate the opening or closure of a baffle due to local pressure or force changes, by merging the behaviours of wall and cyclic conditions. More...

Inheritance diagram for activePressureForceBaffleVelocityFvPatchVectorField:
Collaboration diagram for activePressureForceBaffleVelocityFvPatchVectorField:

Public Member Functions

 TypeName ("activePressureForceBaffleVelocity")
 Runtime type information. More...
 
 activePressureForceBaffleVelocityFvPatchVectorField (const fvPatch &, const DimensionedField< vector, volMesh > &, const dictionary &)
 Construct from patch, internal field and dictionary. More...
 
 activePressureForceBaffleVelocityFvPatchVectorField (const activePressureForceBaffleVelocityFvPatchVectorField &, const fvPatch &, const DimensionedField< vector, volMesh > &, const fvPatchFieldMapper &)
 Construct by mapping given. More...
 
 activePressureForceBaffleVelocityFvPatchVectorField (const activePressureForceBaffleVelocityFvPatchVectorField &)=delete
 Disallow copy without setting internal field reference. More...
 
 activePressureForceBaffleVelocityFvPatchVectorField (const activePressureForceBaffleVelocityFvPatchVectorField &, const DimensionedField< vector, volMesh > &)
 Copy constructor 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 map (const fvPatchVectorField &, const fvPatchFieldMapper &)
 Map the given fvPatchField onto this fvPatchField. More...
 
virtual void reset (const fvPatchVectorField &)
 Reset the fvPatchField to the given fvPatchField. More...
 
virtual void updateCoeffs ()
 Update the coefficients associated with the patch field. More...
 
virtual void write (Ostream &) const
 Write. More...
 

Detailed Description

This boundary condition is applied to the flow velocity, to simulate the opening or closure of a baffle due to local pressure or force changes, 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. This means that this is boundary condition is meant to be used in an extra wall beyond an existing cyclic patch pair. See PDRMesh for more details.

Once the threshold is crossed, this condition activated and continues to open or close at a fixed rate using

\[ x = x_{old} + s \times \frac{dt}{DT} \]

where

$ x $ = baffle open fraction [0-1]
$ x_{old} $ = baffle open fraction on previous evaluation
$ s $ = sign for orientation: 1 to open or -1 to close
$ dt $ = simulation time step
$ DT $ = time taken to open 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 cyclic patch name yes
orientation 1 to open or -1 to close yes
openFraction current open fraction [0-1] yes
openingTime time taken to open or close the baffle yes
maxOpenFractionDelta max fraction change per timestep yes
minThresholdValue minimum absolute pressure or
force difference for activation yes
forceBased force (true) or pressure-based (false) activation yes

Example of the boundary condition specification:

    <patchName>
    {
        type            activePressureForceBaffleVelocity;
        p               p;
        cyclicPatch     cyclic1;
        orientation     1;
        openFraction    0.2;
        openingTime     5.0;
        maxOpenFractionDelta 0.1;
        minThresholdValue 0.01;
        forceBased      false;
    }
Source files

Definition at line 173 of file activePressureForceBaffleVelocityFvPatchVectorField.H.

Constructor & Destructor Documentation

◆ activePressureForceBaffleVelocityFvPatchVectorField() [1/4]

Construct from patch, internal field and dictionary.

Definition at line 34 of file activePressureForceBaffleVelocityFvPatchVectorField.C.

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

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◆ activePressureForceBaffleVelocityFvPatchVectorField() [2/4]

◆ activePressureForceBaffleVelocityFvPatchVectorField() [3/4]

Disallow copy without setting internal field reference.

◆ activePressureForceBaffleVelocityFvPatchVectorField() [4/4]

Copy constructor setting internal field reference.

Definition at line 104 of file activePressureForceBaffleVelocityFvPatchVectorField.C.

Member Function Documentation

◆ TypeName()

TypeName ( "activePressureForceBaffleVelocity"  )

Runtime type information.

◆ clone()

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

Construct and return a clone setting internal field reference.

Definition at line 265 of file activePressureForceBaffleVelocityFvPatchVectorField.H.

◆ map()

void map ( const fvPatchVectorField ptf,
const fvPatchFieldMapper mapper 
)
virtual

Map the given fvPatchField onto this fvPatchField.

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

Areas should be consistent when doing map 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 131 of file activePressureForceBaffleVelocityFvPatchVectorField.C.

◆ reset()

void reset ( const fvPatchVectorField ptf)
virtual

Reset the fvPatchField to the given fvPatchField.

Used for mesh to mesh mapping

Definition at line 162 of file activePressureForceBaffleVelocityFvPatchVectorField.C.

◆ updateCoeffs()

void updateCoeffs ( )
virtual

Update the coefficients associated with the patch field.

Definition at line 186 of file activePressureForceBaffleVelocityFvPatchVectorField.C.

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

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◆ write()

void write ( Ostream os) const
virtual

Write.

Definition at line 296 of file activePressureForceBaffleVelocityFvPatchVectorField.C.

References fvPatchField< Type >::write(), and Foam::writeEntry().

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