稳定分层流动中湍流统计特性和输运特性的数值研究

邱翔; 黄永祥; 卢志明; 刘宇陆

稳定分层流动中湍流统计特性和输运特性的数值研究

1.
上海大学上海市应用数学和力学研究所上海 200072;2.上海大学理学院数学系上海 200444

基金项目: 国家自然科学基金资助项目(10772110;10742005);上海市浦江计划资助项目

详细信息

作者简介:
邱翔(1978- ),男,山东临沂人,博士(E-mail:qiux@shu.edu.cn);刘宇陆,教授,博士(联系人.Tel:+86-21-56332507;E-mail:ylliu@staff.shu.edu.cn).

中图分类号: O357.5
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出版历程
- 收稿日期: 2008-06-25
- 修回日期: 2008-11-14
- 刊出日期: 2009-02-15

Large Eddy Simulation of Turbulent Statistical and Transport Properties in Stably Stratified Flows

1.
Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, P. R. China;

摘要

摘要: 采用大涡模拟方法研究了上下两层温度不同的稳定分层湍流，主要对其中的湍流尺度特性、统计特性和湍流输运特性，以及标量场的时空演化进行了分析研究．研究结果表明：浮力尺度沿流动方向先增加然后趋于某个稳定值，剪切越强，浮力尺度越大；翻转尺度沿流向也是逐渐增大，剪切越强，翻转尺度越大；统计特性的分析发现，在较大的区域内温度脉动的平坦因子都偏离Gauss分布，强分层条件下温度脉动的统计特性与速度脉动的统计特性有较明显差别；湍流混合的过程开始于小尺度运动，最后扩展到大尺度运动．
- 分层湍流 /
- 湍流混合 /
- 湍流输运 /
- 湍流结构
Abstract: Three dimensional large eddy simulation (LES) was performed in the investigation of stably stratified turbulence with a sharp thermal interface. Main results are focused on the turbulent characteristic scale, statistical properties, transport properties, and temporal and spatial evolution of the scalar field. Results show that the buoyancy scale increases first, and then goes to a certain constant value. The stronger the mean shear, the larger the buoyancy scale. The overturning scale increases with the flow, and the mean shear improves the overturning scale. The flatness factor of temperature departs from the Gaussian distribution in a fairly large region, and its statistical properties are clearly different from those of the veloaty fluctuations in a strong stratified case. Turbulent mixing starts from small scale motions, and then extends to large scale motions.
- stratified turbulence /
- turbulent mixing /
- turbulent transport /
- turbulence structure

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参考文献(19)

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稳定分层流动中湍流统计特性和输运特性的数值研究

作者简介:
邱翔(1978- ),男,山东临沂人,博士(E-mail:qiux@shu.edu.cn);刘宇陆,教授,博士(联系人.Tel:+86-21-56332507;E-mail:ylliu@staff.shu.edu.cn).

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Large Eddy Simulation of Turbulent Statistical and Transport Properties in Stably Stratified Flows

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稳定分层流动中湍流统计特性和输运特性的数值研究

作者简介: 邱翔(1978- ),男,山东临沂人,博士(E-mail:qiux@shu.edu.cn);刘宇陆,教授,博士(联系人.Tel:+86-21-56332507;E-mail:ylliu@staff.shu.edu.cn).

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出版历程

Large Eddy Simulation of Turbulent Statistical and Transport Properties in Stably Stratified Flows

计量

出版历程

目录

作者简介:
邱翔(1978- ),男,山东临沂人,博士(E-mail:qiux@shu.edu.cn);刘宇陆,教授,博士(联系人.Tel:+86-21-56332507;E-mail:ylliu@staff.shu.edu.cn).