Convection and correlation of coherent structure in turbulent boundary layer using tomographic particle image velocimetry

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	Convection and correlation of coherent structure in turbulent boundary layer using tomographic particle image velocimetry
	Wang W(王维); Guan XL(管新蕾); Jiang N(姜楠); Jiang, N (reprint author), Tianjin Univ, Dept Mech, Tianjin 300072, Peoples R China.
刊名	Chinese Physics B
	2014-10
卷号	23 期号:10 页码:104703
关键词	Turbulent Boundary Layer Tomographic Particle Image Velocimetry Space-time Correlation Elliptic Model
ISSN号	1674-1056
产权排序	[Wang Wei; Guan Xin-Lei; Jiang Nan] Tianjin Univ, Dept Mech, Tianjin 300072, Peoples R China; [Jiang Nan] Tianjin Key Lab Modern Engn Mech, Tianjin 300072, Peoples R China; [Jiang Nan] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
文献子类	Article
英文摘要	The present experimental work focuses on a new model for space-time correlation and the scale-dependencies of convection velocity and sweep velocity in turbulent boundary layer over a flat wall. A turbulent boundary layer flow at Re-theta = 2460 is measured by tomographic particle image velocimetry (tomographic PIV). It is demonstrated that arch, cane, and hairpin vortices are dominant in the logarithmic layer. Hairpins and hairpin packets are responsible for the elongated low-momentum zones observed in the instantaneous flow field. The conditionally-averaged coherent structures systemically illustrate the key roles of hairpin vortice in the turbulence dynamic events, such as ejection and sweep events and energy transport. The space-time correlations of instantaneous streamwise fluctuation velocity are calculated and confirm the new elliptic model for the space-time correlation instead of Taylor hypothesis. The convection velocities derived from the space-time correlation and conditionally-averaged method both suggest the scaling with the local mean velocity in the logarithmic layer. Convection velocity result based on Fourier decomposition (FD) shows stronger scale-dependency in the spanwise direction than in streamwise direction. Compared with FD, the proper orthogonal decomposition (POD) has a distinct distribution of convection velocity for the large-and small-scales which are separated in light of their contributions of turbulent kinetic energy.
学科主题	Physics
分类号	二类/Q2
URL标识	查看原文
语种	英语
WOS记录号	WOS:000344057600052
资助机构	Project supported by the National Natural Science Foundation of China (Grant Nos. 11332006 and 11272233) and the National Key Basic Research and Development Program of China (Grant No. 2012CB720101).
公开日期	2014-11-27
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/49310]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Jiang, N (reprint author), Tianjin Univ, Dept Mech, Tianjin 300072, Peoples R China.
推荐引用方式 GB/T 7714	Wang W,Guan XL,Jiang N,et al. Convection and correlation of coherent structure in turbulent boundary layer using tomographic particle image velocimetry[J]. Chinese Physics B,2014,23(10):104703.
APA	Wang W,Guan XL,Jiang N,&Jiang, N .(2014).Convection and correlation of coherent structure in turbulent boundary layer using tomographic particle image velocimetry.Chinese Physics B,23(10),104703.
MLA	Wang W,et al."Convection and correlation of coherent structure in turbulent boundary layer using tomographic particle image velocimetry".Chinese Physics B 23.10(2014):104703.