期刊
ICARUS
卷 212, 期 1, 页码 427-437出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.icarus.2010.11.030
关键词
Asteroids, Surfaces; Collisional physics; Geological processes; Regoliths
资金
- National Aeronautics and Space Administration [NNX08AM39G]
- National Science Foundation [AST0524875]
- Observatoire de la Cote d'Azur (OCA)
- French Programme National de Planetologie
- Thales Alenia Space
- The Open University
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1009579] Funding Source: National Science Foundation
We present a new particle-based (discrete element) numerical method for the simulation of granular dynamics, with application to motions of particles on small solar system body and planetary surfaces. The method employs the parallel N-body tree code pkdgrav to search for collisions and compute particle trajectories. Collisions are treated as instantaneous point-contact events between rigid spheres. Particle confinement is achieved by combining arbitrary combinations of four provided wall primitives, namely infinite plane, finite disk, infinite cylinder, and finite cylinder, and degenerate cases of these. Various wall movements, including translation, oscillation, and rotation, are supported. We provide full derivations of collision prediction and resolution equations for all geometries and motions. Several tests of the method are described, including a model granular atmosphere that achieves correct energy equipartition, and a series of tumbler simulations that show the expected transition from tumbling to centrifuging as a function of rotation rate. (C) 2010 Elsevier Inc. All rights reserved.
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