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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.
343 lines
8.3 KiB
C++
343 lines
8.3 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 2011-2017 OpenFOAM Foundation
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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Class
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Foam::trackedParticle
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Description
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Particle class that marks cells it passes through. Used to mark cells
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visited by feature edges.
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SourceFiles
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trackedParticle.C
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\*---------------------------------------------------------------------------*/
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#ifndef trackedParticle_H
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#define trackedParticle_H
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#include "particle.H"
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#include "autoPtr.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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class trackedParticleCloud;
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// Forward declaration of friend functions and operators
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class trackedParticle;
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Ostream& operator<<(Ostream&, const trackedParticle&);
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/*---------------------------------------------------------------------------*\
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Class trackedParticle Declaration
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\*---------------------------------------------------------------------------*/
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class trackedParticle
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:
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public particle
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{
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// Private data
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//- Start point to track from
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point start_;
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//- End point to track to
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point end_;
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//- Level of this particle
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label level_;
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//- Passive label (used to store feature edge mesh)
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label i_;
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//- Passive label (used to store feature edge point)
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label j_;
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//- Passive label (used to store feature edge label)
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label k_;
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public:
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friend class Cloud<trackedParticle>;
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//- Class used to pass tracking data to the trackToFace function
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class trackingData
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:
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public particle::TrackingData<Cloud<trackedParticle>>
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{
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public:
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labelList& maxLevel_;
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List<PackedBoolList>& featureEdgeVisited_;
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// Constructors
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trackingData
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(
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Cloud<trackedParticle>& cloud,
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labelList& maxLevel,
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List<PackedBoolList>& featureEdgeVisited
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)
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:
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particle::TrackingData<Cloud<trackedParticle>>(cloud),
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maxLevel_(maxLevel),
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featureEdgeVisited_(featureEdgeVisited)
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{}
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};
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// Constructors
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//- Construct from components
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trackedParticle
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(
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const polyMesh& mesh,
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const barycentric& coordinates,
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const label celli,
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const label tetFacei,
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const label tetPtI,
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const point& end,
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const label level,
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const label i,
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const label j,
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const label k
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);
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//- Construct from a position and a cell, searching for the rest of the
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// required topology
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trackedParticle
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(
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const polyMesh& mesh,
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const vector& position,
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const label celli,
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const point& end,
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const label level,
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const label i,
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const label j,
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const label k
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);
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//- Construct from Istream
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trackedParticle
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(
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const polyMesh& mesh,
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Istream& is,
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bool readFields = true
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);
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//- Construct and return a clone
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autoPtr<particle> clone() const
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{
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return autoPtr<particle>(new trackedParticle(*this));
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}
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//- Factory class to read-construct particles used for
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// parallel transfer
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class iNew
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{
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const polyMesh& mesh_;
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public:
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iNew(const polyMesh& mesh)
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:
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mesh_(mesh)
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{}
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autoPtr<trackedParticle> operator()(Istream& is) const
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{
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return autoPtr<trackedParticle>
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(
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new trackedParticle(mesh_, is, true)
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);
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}
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};
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// Member Functions
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//- Point to track from
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point& start()
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{
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return start_;
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}
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//- Point to track to
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point& end()
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{
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return end_;
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}
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//- Transported label
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label i() const
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{
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return i_;
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}
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//- Transported label
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label& i()
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{
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return i_;
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}
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//- Transported label
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label j() const
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{
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return j_;
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}
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//- Transported label
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label& j()
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{
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return j_;
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}
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//- Transported label
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label k() const
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{
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return k_;
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}
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//- Transported label
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label& k()
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{
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return k_;
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}
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// Tracking
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//- Track all particles to their end point
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bool move(trackingData&, const scalar);
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//- Overridable function to handle the particle hitting a patch
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// Executed before other patch-hitting functions
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bool hitPatch
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const polyPatch&,
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trackingData& td,
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const label patchi,
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const scalar trackFraction,
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const tetIndices& tetIs
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);
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//- Overridable function to handle the particle hitting a wedge
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void hitWedgePatch
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(
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const wedgePolyPatch&,
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trackingData& td
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);
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//- Overridable function to handle the particle hitting a
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// symmetry plane
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void hitSymmetryPlanePatch
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(
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const symmetryPlanePolyPatch&,
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trackingData& td
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);
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//- Overridable function to handle the particle hitting a
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// symmetry patch
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void hitSymmetryPatch
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(
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const symmetryPolyPatch&,
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trackingData& td
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);
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//- Overridable function to handle the particle hitting a cyclic
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void hitCyclicPatch
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(
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const cyclicPolyPatch&,
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trackingData& td
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);
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//- Overridable function to handle the particle hitting a
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//- processorPatch
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void hitProcessorPatch
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(
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const processorPolyPatch&,
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trackingData& td
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);
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//- Overridable function to handle the particle hitting a wallPatch
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void hitWallPatch
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(
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const wallPolyPatch&,
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trackingData& td,
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const tetIndices&
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);
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//- Overridable function to handle the particle hitting a polyPatch
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void hitPatch
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(
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const polyPatch&,
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trackingData& td
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);
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//- Convert processor patch addressing to the global equivalents
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// and set the celli to the face-neighbour
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void correctAfterParallelTransfer(const label, trackingData&);
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// Ostream Operator
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friend Ostream& operator<<(Ostream&, const trackedParticle&);
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};
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template<>
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inline bool contiguous<trackedParticle>()
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{
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return true;
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}
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//template<>
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//void Cloud<trackedParticle>::readFields();
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//
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//template<>
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//void Cloud<trackedParticle>::writeFields() const;
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************************************************************* //
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