LIGGGHTS
LIGGGHTS is an open source Discrete Element Method particle simulation tool for modeling particulate materials, with a focus on industrial granular and granular heat-transfer simulations. LIGGGHTS stands for “LAMMPS improved for general granular and granular heat transfer simulations,” and it builds on the LAMMPS molecular dynamics platform to extend DEM capabilities toward practical industrial applications. It can be used to simulate systems where material behavior emerges from the motion, collision, friction, cohesion, heat transfer, and interaction of individual particles. It is suitable for analyzing powders, grains, bulk solids, particulate flows, packed beds, conveying systems, mixing processes, hopper discharge, material handling, and other granular systems where particle-scale behavior matters. LIGGGHTS is currently used by research institutions and companies worldwide for the simulation of particulate materials, especially where open source flexibility.
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GROMACS
GROMACS is a free and open source suite for high-performance molecular dynamics and output analysis. It is a versatile package for simulating the Newtonian equations of motion for systems with hundreds to millions of particles, with a strong focus on materials modeling, biomolecular simulation, and particle-based systems. GROMACS is primarily designed for biochemical molecules such as proteins, lipids, and nucleic acids, which involve many complicated bonded interactions, but its speed in calculating nonbonded interactions also makes it useful for non-biological systems such as polymers and other materials. It can model ensembles of particles in liquid, solid, or gaseous states and supports a wide range of molecular dynamics workflows, from basic energy minimization and equilibration to production simulations and detailed trajectory analysis.
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LAMMPS
LAMMPS, the Large-scale Atomic/Molecular Massively Parallel Simulator, is a classical molecular dynamics code with a focus on materials modeling. It models ensembles of particles in liquid, solid, or gaseous states and can simulate atomic, polymeric, biological, solid-state, granular, coarse-grained, mesoscopic, or macroscopic systems using many interatomic potentials, force fields, and boundary conditions. LAMMPS can model systems in two or three dimensions, from only a few particles up to billions, and is designed to run efficiently on parallel computers while remaining easy to extend and modify. It includes potentials for solid-state materials such as metals and semiconductors, soft matter such as biomolecules and polymers, and coarse-grained or mesoscopic systems. It can be used to model atoms or, more generally, as a parallel particle simulator at atomic, meso, or continuum scale.
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NAMD
NAMD is a parallel molecular dynamics code designed for high-performance simulation of large biomolecular systems. Based on Charm++ parallel objects, it scales from desktop and laptop computers to high-end parallel platforms, hundreds of cores for typical simulations, and beyond 500,000 cores for the largest simulations. NAMD is built for researchers who need to simulate large molecular systems efficiently while preserving compatibility with widely used molecular modeling workflows. It uses the popular molecular graphics program VMD for simulation setup and trajectory analysis, and it is file-compatible with AMBER, CHARMM, and X-PLOR. It is designed to support biomolecular simulations involving proteins, membranes, nucleic acids, solvents, ions, and other molecular systems where atomic interactions and time-dependent motion need to be studied in detail.
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