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Lagrangian: Rewrite of the particle tracking algorithm to function in

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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.
This commit is contained in:
Will Bainbridge
2017-04-28 08:03:44 +01:00
parent d2a62df7c4
commit 371762757d
99 changed files with 3081 additions and 5741 deletions
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1
tutorials/incompressible/simpleFoam/motorBike/system/controlDict
View File

@ -47,7 +47,6 @@ runTimeModifiable true;
functions
{
#include "streamLines"
#include "wallBoundedStreamLines"
#include "cuttingPlane"
#include "forceCoeffs"
}

100
tutorials/incompressible/simpleFoam/motorBike/system/wallBoundedStreamLines
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@ -1,100 +0,0 @@
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: dev |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
// Interpolate U to create near-wall UNear
near
{
// Where to load it from
libs ("libfieldFunctionObjects.so");
type nearWallFields;
// Output every
writeControl writeTime;
// Calculate every
executeControl writeTime;
// Fields to be sampled. Per field original name and mapped field to
// create.
// Note: fields only get updated when writing!
fields
(
(U UNear)
);
// Patches/groups to sample (regular expressions)
patches (motorBikeGroup);
// Distance to sample
distance 0.001;
}
// Use UNear to track along wall
wallBoundedStreamLines
{
// Where to load it from (if not already in solver)
libs ("libfieldFunctionObjects.so");
type wallBoundedStreamLine;
// Output every
writeControl writeTime;
setFormat vtk; //gnuplot; //xmgr; //raw; //jplot;
// Velocity field to use for tracking.
U UNear;
// Interpolation method. Default is cellPoint.
// interpolationScheme pointMVC;
// Tracked forwards (+U) or backwards (-U)
trackForward true;
interpolationScheme cellPoint;
// Names of fields to sample. Should contain above velocity field!
fields (p U k UNear);
// Steps particles can travel before being removed
lifeTime 100;
// Cloud name to use
cloudName wallBoundedParticleTracks;
// Seeding method.
seedSampleSet
{
type patchSeed;
uniformCoeffs
{
axis x; //distance;
start (0.0035 0.0999 0.0001);
end (0.0035 0.0999 0.0099);
nPoints 20;
}
cloudCoeffs
{
axis x; //distance;
points ((0.351516548679288 -0.0116085375585099 1.24));
}
patchSeedCoeffs
{
patches (motorBikeGroup);
axis x; //distance;
maxPoints 20000;
}
}
}
// ************************************************************************* //