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Discrete element models for the BODY package #962
This PR contains the implementation of the discrete element models (DEM) for polygons and polyhedra following the models proposed by Langston and coworkers (Fraige et al., Particuology 2008, 6, 455-466, and Wang et al., Granular Matter 2011, 13, 1-12). In these DEM, the polygons and polyhedra are rounded at their vertices and edges by a specified diameter. The interaction between any pair of polygons and polyhedra is determined from a multiple contact model, as described in the mentioned references. The models (including the new atom styles, pair styles and related fixes) are part of the BODY package.
Trung Nguyen (Vietnam Academy of Science and Technology, now at Northwestern) - through discussion with, and suggestion by, Steve Plimpton.
The current models do not take into account the contact history for friction forces as done in the mentioned references.
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@sjplimp this needs some more work in the documentation. there are two issues:
from the jenkins output at https://ci.lammps.org/job/lammps/job/pull-requests/job/build-docs-pr/1397/console