/
activeBaffleVelocityFvPatchVectorField.H
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activeBaffleVelocityFvPatchVectorField.H
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/*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2011-2016 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
OpenFOAM is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
Class
Foam::activeBaffleVelocityFvPatchVectorField
Group
grpCoupledBoundaryConditions
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:
\f[
x = x_{old} + sign(F_{net})\frac{dt}{DT}
\f]
where
\vartable
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
\endvartable
The open fraction is then applied to scale the patch areas.
Usage
\table
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 |
\endtable
Example of the boundary condition specification:
\verbatim
<patchName>
{
type activeBaffleVelocity;
p p;
cyclicPatch cyclic1;
orientation 1;
openFraction 0.2;
openingTime 5.0;
maxOpenFractionDelta 0.1;
}
\endverbatim
See also
Foam::fixedValueFvPatchField
Foam::cyclicFvPatchField
SourceFiles
activeBaffleVelocityFvPatchVectorField.C
\*---------------------------------------------------------------------------*/
#ifndef activeBaffleVelocityFvPatchVectorField_H
#define activeBaffleVelocityFvPatchVectorField_H
#include "fvPatchFields.H"
#include "fixedValueFvPatchFields.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
/*---------------------------------------------------------------------------*\
Class activeBaffleVelocityFvPatchVectorField Declaration
\*---------------------------------------------------------------------------*/
class activeBaffleVelocityFvPatchVectorField
:
public fixedValueFvPatchVectorField
{
// Private data
//- Name of the pressure field used to calculate the force
// on the active baffle
word pName_;
//- Name of the cyclic patch used when the active baffle is open
word cyclicPatchName_;
//- Index of the cyclic patch used when the active baffle is open
label cyclicPatchLabel_;
//- Orientation (1 or -1) of the active baffle patch.
// Used to change the direction of opening without the need for
// reordering the patch faces
label orientation_;
//- Initial wall patch areas
vectorField initWallSf_;
//- Initial this-side cyclic patch areas
vectorField initCyclicSf_;
//- Initial neighbour-side cyclic patch areas
vectorField nbrCyclicSf_;
//- Current fraction of the active baffle which is open
scalar openFraction_;
//- Time taken for the active baffle to open
scalar openingTime_;
//- Maximum fractional change to the active baffle openness
// per time-step
scalar maxOpenFractionDelta_;
label curTimeIndex_;
public:
//- Runtime type information
TypeName("activeBaffleVelocity");
// Constructors
//- Construct from patch and internal field
activeBaffleVelocityFvPatchVectorField
(
const fvPatch&,
const DimensionedField<vector, volMesh>&
);
//- Construct from patch, internal field and dictionary
activeBaffleVelocityFvPatchVectorField
(
const fvPatch&,
const DimensionedField<vector, volMesh>&,
const dictionary&
);
//- Construct by mapping given activeBaffleVelocityFvPatchVectorField
// onto a new patch
activeBaffleVelocityFvPatchVectorField
(
const activeBaffleVelocityFvPatchVectorField&,
const fvPatch&,
const DimensionedField<vector, volMesh>&,
const fvPatchFieldMapper&
);
//- Construct as copy
activeBaffleVelocityFvPatchVectorField
(
const activeBaffleVelocityFvPatchVectorField&
);
//- Construct and return a clone
virtual tmp<fvPatchVectorField> clone() const
{
return tmp<fvPatchVectorField>
(
new activeBaffleVelocityFvPatchVectorField(*this)
);
}
//- Construct as copy setting internal field reference
activeBaffleVelocityFvPatchVectorField
(
const activeBaffleVelocityFvPatchVectorField&,
const DimensionedField<vector, volMesh>&
);
//- Construct and return a clone setting internal field reference
virtual tmp<fvPatchVectorField> clone
(
const DimensionedField<vector, volMesh>& iF
) const
{
return tmp<fvPatchVectorField>
(
new activeBaffleVelocityFvPatchVectorField(*this, iF)
);
}
// Member functions
// Mapping functions
//- Map (and resize as needed) from self given a mapping object
virtual void autoMap(const fvPatchFieldMapper&);
//- Reverse map the given fvPatchField onto this fvPatchField
virtual void rmap(const fvPatchVectorField&, const labelList&);
//- Update the coefficients associated with the patch field
virtual void updateCoeffs();
//- Write
virtual void write(Ostream&) const;
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //