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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.
Source PublicationChinese Physics B
2014-10
Volume23Issue:10Pages:104703
ISSN1674-1056
AbstractThe 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.
KeywordTurbulent Boundary Layer Tomographic Particle Image Velocimetry Space-time Correlation Elliptic Model
Subject AreaPhysics
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Indexed BySCI ; EI ; CSCD
Language英语
WOS IDWOS:000344057600052
Funding OrganizationProject 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).
Classification二类/Q2
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/49310
Collection非线性力学国家重点实验室
Corresponding AuthorJiang, N (reprint author), Tianjin Univ, Dept Mech, Tianjin 300072, Peoples R China.
Recommended Citation
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.
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