中国沙漠 ›› 2006, Vol. 26 ›› Issue (2): 184-188.

• 研究论文 • 上一篇    下一篇


郑晓静1,2, 王 萍1,2   

  1. 1.西部灾害与环境力学教育部重点实验室 甘肃 兰州 730000; 2.兰州大学 力学系, 甘肃 兰州 730000
  • 收稿日期:2004-11-30 修回日期:2004-12-20 出版日期:2006-03-20 发布日期:2006-03-20

Numerical Simulation on Stochastic Movement of Sandsin Wind-blown Sand

ZHENG Xiao-jing1,2, WANG Ping1,2   

  1. 1.Key Laboratory of Mechanics on Western Disaster and Environment, Ministry of Education, Lanzhou 730000, China; 2.Department of Mechanics, Lanzhou University, Lanzhou 730000, China
  • Received:2004-11-30 Revised:2004-12-20 Online:2006-03-20 Published:2006-03-20

摘要: 通过对描述沙粒垂向运动速度脉动分量的随机微分方程的直接求解,获得了风沙流中沙粒运动的随机轨迹。结果表明,由于沙粒垂向脉动速度的影响,沙粒的轨迹与不考虑其垂向脉动速度的情形存在明显不同。在此基础上,通过对大量轨迹的统计计算,得到了沙粒浓度的分布规律。

关键词: 风沙流, 湍流影响, 随机轨迹, 浓度分布, 数值模拟

Abstract: Stochastic sand trajectories in wind-blown sand were obtained by solving the differential equation which describes the vertical fluctuating velocity of sand grains. The results show that because of the effect of account of vertical fluctuating velocity, the trajectories of sand grain involving the effect are differ obviously from that not involving the effect. And then, the concentration profiles were presented based on statistical analysis of ensemble of such stochastic trajectories.

Key words: wind-blown sand, turbulent effect, stochastic trajectory, concentration profile, numerical simulation