Dynamical characteristics of coherent structure in the outer region of turbulence boundary layer |
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Authors: | Liang Zaichao |
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Institution: | (1) Wuhan University of Hydraulic and Electric Engineering, 430072 Wuhan, China |
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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.
The project supported by the National Natural Science Foundation of China |
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Keywords: | outer region of turbulence boundary layer coherent structure lateral vortices |
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