计算物理 ›› 2006, Vol. 23 ›› Issue (5): 559-563.

• 论文 • 上一篇    下一篇

两种不同尺度的颗粒在水平振动容器内分离规律的模拟

周迪文, 陈十一, 蔡庆东   

  1. 北京大学力学与工程科学系, 湍流与复杂系统国家重点实验室, 北京 100871
  • 收稿日期:2005-05-17 修回日期:2005-09-12 出版日期:2006-09-25 发布日期:2006-09-25
  • 作者简介:周迪文(1980-),男,浙江杭州,硕士生,从事计算流体力学方面的研究.
  • 基金资助:
    国家自然科学基金(No.10128204)资助项目

Simulation of Size Segregation of Granulars with Two Sizes in a Horizontal Vibrating Container

ZHOU Di-wen, CHEN Shi-yi, CAI Qing-dong   

  1. LTCS, Department of Mechanics and Engineering Science, Peking University, Beijing 100871, China
  • Received:2005-05-17 Revised:2005-09-12 Online:2006-09-25 Published:2006-09-25

摘要: 用分子动力学方法模拟二维颗粒系统在水平振动下的分离现象.通过数值模拟发现,在固定的振幅下,存在使得分离效率最佳的振动频率,在固定的振动频率下,也存在一个使得分离效率最佳的振幅.根据模拟结果,给出了最佳振幅对振动频率的经验公式.同时,还指出了存在两种不同的分离机制,当振动的加速度过大时,处于垂直边界附近的大粒子会通过容器的边界直接被抛到最顶部.

关键词: 颗粒流动, 尺度分离, 分子动力学模拟

Abstract: The size segregation of grains is studied with two-dimensional molecular dynamic simulations for dissipative particles under horizontal vibration.A series of segregation that induced by horizontal vibrations at different amplitudes and frequencies are reported and the relationship between these two aspects is analyzed.A standard is given to scale the speed of the segregation.It is found that an optimal amplitude exists at a given frequency.An empiristic formula is obtained for this amplitude.It shows that another segregation mechanism exists at a large amplitude and frequency,in which the big particles are thrown directly to the top by the side wall.

Key words: granular flow, size segregation, molecular dynamic simulation

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