计算物理 ›› 2006, Vol. 23 ›› Issue (2): 171-176.

• 研究论文 • 上一篇    下一篇

微尺度后台阶流动的Monte Carlo直接模拟

秦丰华, 孙德军, 尹协远   

  1. 中国科技大学 力学与机械工程系, 安徽 合肥 230027
  • 收稿日期:2004-10-22 修回日期:2005-04-18 出版日期:2006-03-25 发布日期:2006-03-25
  • 作者简介:泰丰华(1975-),男,湖北秭归,博士生,从事微尺度流动研究,合肥中国科技大学五系230027.
  • 基金资助:
    中国科学院创新项目(KJCX2-SW-L2);中国科技大学青年基金(19702017)资助项目

Direct Monte Carlo Simulation of a Microscale Backward-facing Flow

Qin Feng-hua, Sun De-jun, Yin Xie-yuan   

  1. Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China
  • Received:2004-10-22 Revised:2005-04-18 Online:2006-03-25 Published:2006-03-25

摘要: 对DSMC方法中压力边界条件的实现给出了一种改进的方法,并分区模拟了微尺度后台阶气体流动,得到了其流动的一般典型结构.计算结果表明经典后台阶流动中的回流区在一定参数范围内仍然存在,但上壁面的分离区消失.讨论了流动参数对流动结构的影响,并给出了再附长度与流动参数的关系.

关键词: DSMC, 压力边界条件, 分区, 微尺度后台阶流动, 再附长度

Abstract: A modified treatment for pressure boundary conditions in DSMC is shown, The microscale backward-facing gas flow is computed by a partitioned domain DSMC method and a general flow construction is obtained. It is shown that the recirculating flow region attached to the backward-facing step exists in the microscale flow with proper conditions while the region of separation on upper side does not. A discussion about the effect of flow parameters is given and a relationship between reattachment length and Reynolds number is obtained.

Key words: DSMC, pressure boundary condition, microscale backward-facing, reattachment length

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