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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.
OpenFOAM Configuration
The main OpenFOAM settings are located in the parent etc/ directory. The bash and csh shells are supported and to configure OpenFOAM source etc/bashrc or etc/cshrc respectively which source the following files in the config.sh or config.csh respectively:
settings: core settingsaliases: aliases for interactive shellsunset: sourced to clear as many OpenFOAM environment settings as possiblempi: MPI communications library settingsensight: application settings for EnSightparaview: application settings for ParaViewscotch: application settings for compiling against scotchmetis: application settings for compiling against metis 5
The config.*/example directories contains various example configuration files for the corresponding shell:
compiler: an example of fine tuning ThirdParty compiler settingsopenmpi: an example of fine tuning openmpi settings for OpenFOAMparaview: an example of chaining to the standard config/paraview with a different ParaView_VERSIONprefs: an example of supplying alternative site-defined settings