计算物理 ›› 2013, Vol. 30 ›› Issue (1): 11-18.

• 论文 • 上一篇    下一篇

旋转体系中湍流的LBM模拟

聂德明1, 林建忠1,2, 黄利忠2   

  1. 1. 中国计量学院 计量测试工程学院, 浙江 杭州 310018;
    2. 浙江大学 力学系, 浙江 杭州 310027
  • 收稿日期:2012-04-27 修回日期:2012-08-01 出版日期:2013-01-25 发布日期:2013-01-25
  • 作者简介:聂德明(1979-),男,博士,副教授,研究方向为多相流、湍流,E-mail:nieinhz@cjlu.edu.cn
  • 基金资助:
    国家自然科学基金重点项目(11132008);浙江省高等学校优秀青年教师资助计划项目

Lattice-Boitzmann Investigation of Rotating Turbulence

NIE Deming1, LIN Jianzhong1,2, HUANG Lizhong2   

  1. 1. College of Metrology and Technology Engineering, China Jiliang University, Hangzhou 310018, China;
    2. Department of Mechanics, Zhejiang University, Hangzhou 310027, China
  • Received:2012-04-27 Revised:2012-08-01 Online:2013-01-25 Published:2013-01-25

摘要: 采用基于多松弛时间因子的格子Boltzmann方法对旋转体系中的湍流进行数值研究,考察Rossby数和Ekman数对湍流的影响,包括湍流能量及其耗散率、速度、涡结构及湍流的耗散尺度即Kolmorogov尺度和积分尺度等.研究表明,系统的旋转延缓了湍流能量的衰减速率,逐步破坏初始涡结构的均匀性,与旋转方向相反的涡逐步被抑制,并最终形成若干与旋转同向的涡柱.结果还表明,系统旋转越快,湍流的耗散尺度越小而积分尺度越大.

关键词: 格子Boltzmann方法, 旋转体系, 湍流

Abstract: Turbulence in the presence of rotation is numerically investigated with MRT-lattice Bohzmann method. Influence of rotation (Rossby number and Ekman number) on turbulence is studied in detail. Numerical results include turbulence energy, dissipation rate, iso-surface of velocity, vortex structure, dissipation length and integral length and so on. It shows that rotation slows down turbulence energy decaying rate. Moreover, the initial homogeneity of turbulence is broken down in the presence of rotation. Vortices rotating in opposite direction of the system are suppressed gradually and columnar vortices appear rotating in the same direction of the system eventually. In addition, it was found that Kolmogorov length decreases as rotation increases while integral length increases.

Key words: lattice-Boltzmann method, rotation system, turbulence

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