| 肋片对后台阶湍流流动影响的数值模拟 |
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| 引用本文： | 王小华,何钟怡. 肋片对后台阶湍流流动影响的数值模拟[J]. 计算物理, 2005, 22(4): 344-350 |
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| 作者姓名： | 王小华 何钟怡 |
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| 作者单位： | 浙江大学机械能源学院流体工程研究所,浙江,杭州,310027;哈尔滨工业大学市政环境工程学院,黑龙江,哈尔滨,150090;哈尔滨工业大学市政环境工程学院,黑龙江,哈尔滨,150090 |
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| 摘 要： | 采用二阶全展开ETG有限元方法作为大涡模拟空间离散格式,计算了Reynolds数为47625条件下的后台阶湍流流动,结果与相关实验资料符合良好,在此基础上分析了附加肋片高度和肋距对后台阶湍流流动的影响.计算结果表明,不同肋高和肋距对台阶下游流动具有较大的影响,相应条件下台阶下游的涡系及其时变过程都发生了很大的变化,计算给出了台阶回流段长度随肋高和随肋距变化的曲线,并指出,在台阶下游附加肋片可以作为后台阶湍流流动一种简单有效的被动控制方式.
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| 关 键 词： | 后台阶湍流流动 肋片 有限元 大涡模拟 被动控制 |
| 文章编号： | 1001-246X（2005）04-0344-07 |
| 收稿时间： | 2004-04-09 |
| 修稿时间： | 2004-11-25 |
Influence of a Ripplet on the Turbulent Flow Behind a Backward Facing Step |
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| Wang Xiao-hua,HE Zhong-yi. Influence of a Ripplet on the Turbulent Flow Behind a Backward Facing Step[J]. Chinese Journal of Computational Physics, 2005, 22(4): 344-350 |
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| Authors: | Wang Xiao-hua HE Zhong-yi |
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| Affiliation: | 1. Institute of Fluid Engineering, College of Mechanical and Energy Engineering, Zhejiang University, Hangzhou 310012, China;2. Harbin Institute of Technology, Harbin 150090, China |
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| Abstract: | With the second order Euler-Taylor-Galerkin (ETG) finite element method, a large eddy simulation (LES) is used to simulate turbulent flows over a backward-facing step at Re=47 625. The simulation agrees well with Armaly's experiments.The influence of a ripplet on the turbulent flow is calculated. It is shown that large scale eddies and corresponding reattachment lengths change greatly with the ripplet height and its distance to the step. We argue that adding a ripplet could be a simple and effective passive control to the turbulent flow over a backward-facing step. |
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| Keywords: | turbulent flow over a backward-facing step ripplet finite element method large eddy simulation passive control method |
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