小天体探测是当今太阳系探测的一大热点,对小行星演化的研究有助于人们了解太阳系的起源.演化研究的一项重要内容是小天体结构的演化,即小天体在多种力学机制作用下自身形状与结构的演化.在小天体碎石堆结构的假设之下,一种比较常见的模拟小天体结构演化的方法是离散元仿真算法(Discrete Element Method,DEM),目前国内外有数个团队开发了相关算法软件.本文介绍了团队开发的《基于DEM仿真算法的多粒子系统模拟软件》的基础理论、实现方法以及加速算法,并使用二体接触模型、声速传播仿真、小行星内部压强、小行星旋转稳定性仿真算例验证了算法的可靠性.
Discrete Element Method Simulation System for Asteroid
Asteroid detection is now a hot spot of solar system exploration.The understanding of the evolution of asteroids has a great benefit on researches to the origin of the solar system.An important topic of the evolution research is the evolution of inner structures of asteroids,in other words,asteroids'evolution of shapes and structures under multiple mechanisms.A common method to simulate the dy-namical evolution of asteroids is Discrete Element Method(DEM)under the assumption that asteroids are in rubble-pile structures.Some teams have developed several kinds of softwares for DEM simulations.The basics,realization,algorithms of our software"Multi-particle system simulation software based on DEM algorithm"are introduced in this article and the software is verified using two body collision,sound wave propagation,inner stress of asteroid,and asteroid spin disruption setups.
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