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Aspherix® is available under commercial license and combines DCS’s learnings from the development of LIGGGHTS® and a large set of new, cutting edge features. For more information, please visit https://www.aspherix-dem.com/.

Cronology of the development:

• LAMMPS: core development by Sandia Corporation since 2003
• LIGGGHTS® core development by DCS Computing GmbH and JKU Linz since 2009
• Aspherix®: core development by DCS Computing GmbH since 2019

LIGGGHTS®-PUBLIC is an Open Source Discrete Element Method Particle Simulation Software, distributed by DCS Computing GmbH, Linz, Austria. LIGGGHTS® is a registered trade marks of DCS Computing GmbH, the producer of the LIGGGHTS® software; see http://www.cfdem.com/terms-trademark-policy for details.

LIGGGHTS®-PUBLIC is open-source, distributed under the terms of the GNU Public License, version 2 or later. LIGGGHTS®-PUBLIC is part of CFDEM(R)project: www.liggghts.com | www.cfdem.com Core developer and main author: Christoph Kloss, [email protected]

All LIGGGHTS® versions are based on a specific version of LIGGGHTS®, as printed in the file src/version.h. LIGGGHTS® versions are identidied by a version number (e.g. ‘3.0’), a branch name (which is ‘LIGGGHTS®-PUBLIC’ for your release of LIGGGHTS), compilation info (date / time stamp and user name), and a LAMMPS version number (which is the LAMMPS version that the LIGGGHTS®-PUBLIC release is based on). The LAMMPS “version” is the date when it was released, such as 1 May 2010.

If you browse the HTML doc pages on the LIGGGHTS®-PUBLIC website (https://www.cfdem.com/media/DEM/docu/Manual.html), they always describe the most current version of LIGGGHTS®-PUBLIC. If you browse the HTML doc pages included in your tarball, they describe the version you have.

Some parts of LIGGGHTS® are based on LAMMPS. LAMMPS stands for Large-scale Atomic/Molecular Massively Parallel Simulator. LAMMPS is Copyright (2003) Sandia Corporation. Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains certain rights in this software. This software is distributed under the GNU General Public License.

LAMMPS is a classical molecular dynamics simulation code designed to run efficiently on parallel computers. It was developed at Sandia National Laboratories, a US Department of Energy facility, with funding from the DOE. It is an open-source code, distributed freely under the terms of the GNU Public License (GPL).

The primary author of LAMMPS is Steve Plimpton, who can be emailed at [email protected]. The LAMMPS WWW Site at lammps.sandia.gov has more information about the code and its uses.

The LIGGGHTS® distribution includes the following files and directories:

• README: this file
• LICENSE: the GNU General Public License (GPL)
• doc: documentation
• examples: simple example simulation setups
• lib: libraries LIGGGHTS® can be linked with
• python: Python wrapper on LIGGGHTS® as a library
• src: source files

Point your browser at any of these files to get started:

• doc/Manual.html: the manual
• doc/Section_intro.html: hi-level introduction
• doc/Section_start.html: how to build and use

• Copyright 2012-now: DCS Computing GmbH, Linz
• Copyright 2009-2015: JKU Linz Some parts of LIGGGHTS® are based on LAMMPS and Copyright on these parts is held by Sandia Corporation and other parties. Info on LAMMPS below Some parts of LIGGGHTS® are contributied by other parties, which are holding the Copyright. This is listed in each file of the distribution.

If you are using PhasicFlow in your research or industrial work, cite the following article:

@article{kloss2012models,
  title={Models, algorithms and validation for opensource DEM and CFD--DEM},
  author={Kloss, Christoph and Goniva, Christoph and Hager, Alice and Amberger, Stefan and Pirker, Stefan},
  journal={Progress in Computational Fluid Dynamics, an International Journal},
  volume={12},
  number={2-3},
  pages={140--152},
  year={2012},
  publisher={Inderscience Publishers}
}