Abstract
In the present paper the coherent structures in the outer region of turbulent boundary layer were investigated experimentally and analytically. From the observation of the flow field over smooth wall, rough wall and sand wave wall, it was found that the direct effect of wall on the flow structure can reachy +1≈100, and both lateral and vertical vortices exist in the outer region, but the coherent structures in the outer region are mainly the formation, development and decay of the large-scale lateral vortices. By experimental and dynamical analysis, some influence factors and their relations associated with the dynamical process of lateral vortices were deduced.
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References
Toninaga A, Nezu I, Ezaki K, Nakagawa H. Three-dimensional turbulent structure in straight open channel flows.J Hydraulic Research, 1989, 27(1): 149–173
Robinson SK. Coherent motion in the turbulent boundary layer. Annu Rev Fluid Mech, 1991, 32: 601–639
Jackson R. Sedimentological and fluid-dynamic implications of the turbulent bursting phenomenon in geophysical flows.J Fluid Mech, 1976, 77: 536–560
Lian QX. A visual study of the coherent structure of the turbulent boundary layer in flow with adverse pressure gradient.J Fluid Mech, 1990, 215: 101–124
Utami T, Ueno T. Experimental study on the coherent structure of turbulent open-channel flow using visualization and picture processing.J Fluid Mech, 1987, 174: 399–440
Liang ZC, Liu SH. Properties of mean flow and turbulent structures in the wall region of turbulent boundary layer. In: Zhuang Fenggan ed. Proceedings of the Second International Conference on Fluid Mechanics. Beijing: Peking University, 1993: 115–120
Chu China-Chou, Wang Chi-Tzung Hsien Chang-Shyue. An experimental investigation of vortex motions near surfaces.Phys Fluids, 1993, A5 (3): 662–676
Liang ZC, Zhang DH. Dynamical characteristics of the lateral vortices in the outer region of turbulent boundary layer. In: Chew YT, Tso CP eds. Proc of the Sixth Asian Conf on Fluid Mech. Singapore, 1995. 326–329
Hussian AKM. Coherent Structure—Reality and Myth.Phys Fluid, 1983, 26(10)
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The project supported by the National Natural Science Foundation of China
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Zaichao, L. Dynamical characteristics of coherent structure in the outer region of turbulence boundary layer. Acta Mech Sinica 12, 289–295 (1996). https://doi.org/10.1007/BF02487795
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DOI: https://doi.org/10.1007/BF02487795