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).

中图分类号: O357
计量
- 文章访问数: 2741
- HTML全文浏览量: 150
- PDF下载量: 788
- 被引次数: 0
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

HTML全文

参考文献(14)

[1]	Kolmogorov A N.Dissipation of energy in the locally isotropic turbulence[J].Dokl Akad Nauk SSSR,1941,32(1):19—21.
[2]	Kline S J, Reynolds W C, Schraub F H,et al.The structure of turbulent boundary layer[J].Journal of Fluid Mechanics,1967,30(4):741—774. doi: 10.1017/S0022112067001740
[3]	王振东.湍流研究的进展[J].物理通报，1992，12(12)：1—4.
[4]	黄永念.湍流与混沌之间关系的发展近况[A].见：黄永念主编.第三届全国湍流与流动稳定性学术会议论文集[C].第三届全国湍流与流动稳定性学术会议，天津，1991，1—6.
[5]	Douady S, Couder Y,Brachet M E.Direct observation of intermittency of intense vorticity filaments in turbulence[J].Physics Review Letter,1991,67(8):983—986. doi: 10.1103/PhysRevLett.67.983
[6]	Siggia E D.Numerical study of small-scale intermittency in 3-dimensional turbulence[J].Journal of Fluid Mechanics,1981,107:375—406. doi: 10.1017/S002211208100181X
[7]	Vincent A，Meneguzzi M.The spatial structure and statistical properties of homogeneous turbulence[J].Journal of Fluid Mechanics,1991,225:1—20. doi: 10.1017/S0022112091001957
[8]	SHE Zhen-su,Jackson E,Orszag S A.Intermittent vortex structures in homogeneous isotropic turbulence[J].Nature,1990,344(62/63):226—228. doi: 10.1038/344226a0
[9]	Chavarria G Ruiz,Ciliberto S,Baudet C,et al.Scaling properties of the streamwise component of velocity in a turbulent boundary layer[J].Physica D,2000,141(3):183—198. doi: 10.1016/S0167-2789(00)00028-2
[10]	Toschi F,Amati G,Succi S,et al.Intermittency and structure functions in channel flow turbulence[J].Physics Review Letter,1999,82(25):5044—5047. doi: 10.1103/PhysRevLett.82.5044
[11]	Toschi F,Leveque E,Chavarria G Ruiz.Shear effects in non-homogeneous turbulence[J].Physics Review Letter,2000,85(7):1436—1439. doi: 10.1103/PhysRevLett.85.1436
[12]	Camussi R,Guj G.Orthonormal wavelet decomposition of turbulent flows: intermittency and coherent structures[J].Journal of Fluid Mechanics,348:177—199.
[13]	Onorato Miguel,Camussi Roberto,Iuso Gaetano.Small scale intermittency and bursting in a turbulent channel flow[J].Physical Review E,61(2):1447—1454.
[14]	舒玮，姜楠.湍流中涡的尺度分析[J].空气动力学报，2000，18(supp)：89—95.

施引文献

资源附件(0)

访问统计

计量

文章访问数: 2741
HTML全文浏览量: 150
PDF下载量: 788
被引次数: 0

姓名
邮箱
手机号码
标题
留言内容
验证码

留言板

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).

计量

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

计量

目录

留言板

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).

计量

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).