Research paper
A kind of fast changing coherent structure in a turbulent boundary layer
Qixiang Lian
Institute of Fluid Mechanics, Beijing Univ. of Aero. & Astro, Beijing 100083, China
Abstract Coherent structures of a turbulent boundary layer were investigated
by hydrogen bubble method. A kind of fast changing structure was observed. That
is a spot in which all the hydrogen bubbles vanish much faster than in other regions.
This investigation verified that dark-spot is formed by a strong sweep from outer
layer. Inside a dark-spot the local instantaneous flow speed might be four times of
its neighboring high-speed streaks. Comparing with the low/high speed streaks, both
dark-spot and the vortical structures around it are changing very fast. Around dark-
spot intensive shear layers are formed and indications of the generation of small-scale
structures could be observed.
Keywords
turbulent boundary layer, coherent structure, small-scale structure
Received: 25 April 2008
Cite this article:
Qixiang Lian. A kind of fast changing coherent structure in a turbulent boundary layer[J]. Acta Mechanica Sinica, 1999, 15(3): 193-200.
trendmd
[1]
Zhan-Qi Tang, Nan Jiang, Andreas Schröder, Reinhard Geisler. Tomographic PIV investigation of coherent structures in a turbulent boundary layer flow
[2]
Jia-Ning Tang, Chien-Chou Tseng, Ning-Fei Wang. Lagrangian-based investigation of multiphase flows by finite-timeLyapunov exponents
[3]
X.T. Shi J. Chen W.T. Bi C.W. Shu Z.S. She. Numerical simulations of compressible mixing layers with a discontinuous Galerkin method
[4]
Mingzhou Yu Jianzhong Lin Tatleung Chan. Large eddy simulation of a planar jet flow with nanoparticle coagulation
[5]
Xiongping Luo; Shiyi Chen. Transport of particles in an atmospheric turbulent boundary layer
[6]
Xilin Xie; Weiwei Ma; Huiliang Zhou. Coherent structures in countercurrent axisymmetric shear flows
[7]
Jianzhong Lin. WAVELET ANALYSIS OF COHERENT STRUCTURES IN A THREE-DIMENSIONAL MIXING LAYER
[8]
Hanzhong Zhao Yeo Khoon Seng. A theoretical mode for the instability of turbulent boundary layer over compliant surface
[9]
Shuangfeng Wang Fu Jia. Some characteristics of low-speed streaks under sheared air-water interfaces
[10]
Shuangfeng Wang Fu Jia Zhennan Niu Zhangzhi Wu. An experimental study on turbulent coherent structures near a sheared air-water interface
[11]
Zaichao Liang. Dynamical characteristics of coherent structure in the outer region of turbulence boundary layer
[12]
Guocan Ling Zuobing Wu. Three-dimensional evolution of vortices and early features of coherent structure in the turbulent wake behind a 2-d circular cylinder
[13]
Daozeng Wang. Effects of turbulent coherent structure on plume diffusion in atmosphere boundary layer
[14]
Shifen Wang Qingquan Li. Nature of the surface heat transfer fluctuation in a hypersonic separated turbulent flow
[15]
Wei Shu Weiming Liu. The effect of compliant coatings on coherent structure in turbulent boundary layers
E-mail Alert 
RSS 
