用局部平均速度结构函数检测湍流边界层多尺度相干结构

刘建华; 姜楠; 王振东; 舒玮

用局部平均速度结构函数检测湍流边界层多尺度相干结构

天津大学力学系,天津 300072

基金项目: 国家自然科学基金资助项目(10472081;10232020)

详细信息

作者简介:
刘建华(1980- ),硕士(E-mail:liujianhua-1980@163.com);姜楠(1968- ),教授,博士生导师,主要从事湍流实验研究(联系人.Tel:+86-22-27403574;Fax:+86-22-27407025;E-mail:nanj@tju.edu.cn).

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出版历程
- 收稿日期: 2004-02-25
- 修回日期: 2004-12-24
- 刊出日期: 2005-04-15

Multi-Scale Coherent Structures in Turbulent Boundary Layer Detected by Locally Averaged Velocity Structure Functions

Department of Mechanics, Tianjin University, Tianjin 300072, P. R. China

摘要

摘要: 测量风洞中平板湍流边界层不同法向位置的流向速度时间序列信号，提出了基于局部多尺度平均意义的湍流多尺度局部平均结构函数的概念，以描述湍流多尺度结构的伸缩变形和相对运动；基于多尺度局部平均结构函数的概念与Harr子波变换的一致性，提出了用湍流多尺度局部平均结构函数的平坦因子检测湍流边界层多尺度相干结构及其间歇性的检测方法，提取近壁区域不同法向位置处多尺度相干结构的条件相位平均波形，以研究多尺度相干结构猝发的动力学过程及其对湍流统计性质的影响．
- 湍流边界层 /
- 相干结构 /
- 平坦因子 /
- 间歇性 /
- 局部平均速度结构函数
Abstract: Abstract:The time sequence of longitudinal velocity component at different vertical locations in turbulent boundary layer was finely measured in a wind tunnel.The concept of coarse-grained velocity structure functions,which describes the relative motions of straining and compressing for multi-scale eddy structures in turbulent flows,was put forward based on the theory of locally multi-scale average.Based on the consistency between coarse-grained velocity structure function and Harr wavelet transformation,detecting method was presented,by which the coherent structures and their intermittency was identified by multi-scale flatness factor calculated by locally average structure function. Phase-averaged evolution course for multi-scale coherent eddy structures in wall turbulence were extracted by this conditional sampling to educe scheme.The dynamics course of multi-scale coherent eddy structures and their effects on statistics of turbulent flows were studied.
- turbulent boundary layer /
- coherent structure /
- flatness factor /
- intermittency /
- locally averaged velocity structure function

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参考文献(14)

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用局部平均速度结构函数检测湍流边界层多尺度相干结构

作者简介:
刘建华(1980- ),硕士(E-mail:liujianhua-1980@163.com);姜楠(1968- ),教授,博士生导师,主要从事湍流实验研究(联系人.Tel:+86-22-27403574;Fax:+86-22-27407025;E-mail:nanj@tju.edu.cn).

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Multi-Scale Coherent Structures in Turbulent Boundary Layer Detected by Locally Averaged Velocity Structure Functions

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用局部平均速度结构函数检测湍流边界层多尺度相干结构

作者简介: 刘建华(1980- ),硕士(E-mail:liujianhua-1980@163.com);姜楠(1968- ),教授,博士生导师,主要从事湍流实验研究(联系人.Tel:+86-22-27403574;Fax:+86-22-27407025;E-mail:nanj@tju.edu.cn).

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出版历程

Multi-Scale Coherent Structures in Turbulent Boundary Layer Detected by Locally Averaged Velocity Structure Functions

计量

出版历程

目录

作者简介:
刘建华(1980- ),硕士(E-mail:liujianhua-1980@163.com);姜楠(1968- ),教授,博士生导师,主要从事湍流实验研究(联系人.Tel:+86-22-27403574;Fax:+86-22-27407025;E-mail:nanj@tju.edu.cn).