Files
openfoam/src/mesh/snappyHexMesh/trackedParticle/trackedParticle.H
Will Bainbridge 743dea87d2 Lagrangian: Rewrite of the particle tracking algorithm to function in
terms of the local barycentric coordinates of the current tetrahedron,
rather than the global coordinate system.

Barycentric tracking works on any mesh, irrespective of mesh quality.
Particles do not get "lost", and tracking does not require ad-hoc
"corrections" or "rescues" to function robustly, because the calculation
of particle-face intersections is unambiguous and reproducible, even at
small angles of incidence.

Each particle position is defined by topology (i.e. the decomposed tet
cell it is in) and geometry (i.e. where it is in the cell). No search
operations are needed on restart or reconstruct, unlike when particle
positions are stored in the global coordinate system.

The particle positions file now contains particles' local coordinates
and topology, rather than the global coordinates and cell. This change
to the output format is not backwards compatible. Existing cases with
Lagrangian data will not restart, but they will still run from time
zero without any modification. This change was necessary in order to
guarantee that the loaded particle is valid, and therefore
fundamentally prevent "loss" and "search-failure" type bugs (e.g.,
2517, 2442, 2286, 1836, 1461, 1341, 1097).

The tracking functions have also been converted to function in terms
of displacement, rather than end position. This helps remove floating
point error issues, particularly towards the end of a tracking step.

Wall bounded streamlines have been removed. The implementation proved
incompatible with the new tracking algorithm. ParaView has a surface
LIC plugin which provides equivalent, or better, functionality.

Additionally, bug report <https://bugs.openfoam.org/view.php?id=2517>
is resolved by this change.
2017-04-28 08:03:44 +01:00

343 lines
8.3 KiB
C++

/*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2011-2017 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.
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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::trackedParticle
Description
Particle class that marks cells it passes through. Used to mark cells
visited by feature edges.
SourceFiles
trackedParticle.C
\*---------------------------------------------------------------------------*/
#ifndef trackedParticle_H
#define trackedParticle_H
#include "particle.H"
#include "autoPtr.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
class trackedParticleCloud;
// Forward declaration of friend functions and operators
class trackedParticle;
Ostream& operator<<(Ostream&, const trackedParticle&);
/*---------------------------------------------------------------------------*\
Class trackedParticle Declaration
\*---------------------------------------------------------------------------*/
class trackedParticle
:
public particle
{
// Private data
//- Start point to track from
point start_;
//- End point to track to
point end_;
//- Level of this particle
label level_;
//- Passive label (used to store feature edge mesh)
label i_;
//- Passive label (used to store feature edge point)
label j_;
//- Passive label (used to store feature edge label)
label k_;
public:
friend class Cloud<trackedParticle>;
//- Class used to pass tracking data to the trackToFace function
class trackingData
:
public particle::TrackingData<Cloud<trackedParticle>>
{
public:
labelList& maxLevel_;
List<PackedBoolList>& featureEdgeVisited_;
// Constructors
trackingData
(
Cloud<trackedParticle>& cloud,
labelList& maxLevel,
List<PackedBoolList>& featureEdgeVisited
)
:
particle::TrackingData<Cloud<trackedParticle>>(cloud),
maxLevel_(maxLevel),
featureEdgeVisited_(featureEdgeVisited)
{}
};
// Constructors
//- Construct from components
trackedParticle
(
const polyMesh& mesh,
const barycentric& coordinates,
const label celli,
const label tetFacei,
const label tetPtI,
const point& end,
const label level,
const label i,
const label j,
const label k
);
//- Construct from a position and a cell, searching for the rest of the
// required topology
trackedParticle
(
const polyMesh& mesh,
const vector& position,
const label celli,
const point& end,
const label level,
const label i,
const label j,
const label k
);
//- Construct from Istream
trackedParticle
(
const polyMesh& mesh,
Istream& is,
bool readFields = true
);
//- Construct and return a clone
autoPtr<particle> clone() const
{
return autoPtr<particle>(new trackedParticle(*this));
}
//- Factory class to read-construct particles used for
// parallel transfer
class iNew
{
const polyMesh& mesh_;
public:
iNew(const polyMesh& mesh)
:
mesh_(mesh)
{}
autoPtr<trackedParticle> operator()(Istream& is) const
{
return autoPtr<trackedParticle>
(
new trackedParticle(mesh_, is, true)
);
}
};
// Member Functions
//- Point to track from
point& start()
{
return start_;
}
//- Point to track to
point& end()
{
return end_;
}
//- Transported label
label i() const
{
return i_;
}
//- Transported label
label& i()
{
return i_;
}
//- Transported label
label j() const
{
return j_;
}
//- Transported label
label& j()
{
return j_;
}
//- Transported label
label k() const
{
return k_;
}
//- Transported label
label& k()
{
return k_;
}
// Tracking
//- Track all particles to their end point
bool move(trackingData&, const scalar);
//- Overridable function to handle the particle hitting a patch
// Executed before other patch-hitting functions
bool hitPatch
(
const polyPatch&,
trackingData& td,
const label patchi,
const scalar trackFraction,
const tetIndices& tetIs
);
//- Overridable function to handle the particle hitting a wedge
void hitWedgePatch
(
const wedgePolyPatch&,
trackingData& td
);
//- Overridable function to handle the particle hitting a
// symmetry plane
void hitSymmetryPlanePatch
(
const symmetryPlanePolyPatch&,
trackingData& td
);
//- Overridable function to handle the particle hitting a
// symmetry patch
void hitSymmetryPatch
(
const symmetryPolyPatch&,
trackingData& td
);
//- Overridable function to handle the particle hitting a cyclic
void hitCyclicPatch
(
const cyclicPolyPatch&,
trackingData& td
);
//- Overridable function to handle the particle hitting a
//- processorPatch
void hitProcessorPatch
(
const processorPolyPatch&,
trackingData& td
);
//- Overridable function to handle the particle hitting a wallPatch
void hitWallPatch
(
const wallPolyPatch&,
trackingData& td,
const tetIndices&
);
//- Overridable function to handle the particle hitting a polyPatch
void hitPatch
(
const polyPatch&,
trackingData& td
);
//- Convert processor patch addressing to the global equivalents
// and set the celli to the face-neighbour
void correctAfterParallelTransfer(const label, trackingData&);
// Ostream Operator
friend Ostream& operator<<(Ostream&, const trackedParticle&);
};
template<>
inline bool contiguous<trackedParticle>()
{
return true;
}
//template<>
//void Cloud<trackedParticle>::readFields();
//
//template<>
//void Cloud<trackedParticle>::writeFields() const;
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //