Acta Mechanica Sinica

, Volume 12, Issue 4, pp 289–295 | Cite as

Dynamical characteristics of coherent structure in the outer region of turbulence boundary layer

  • Liang Zaichao
Article

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.

Key Words

outer region of turbulence boundary layer coherent structure lateral vortices 

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Copyright information

© Chinese Society of Theoretical and Applied Mechanics 1996

Authors and Affiliations

  • Liang Zaichao
    • 1
  1. 1.Wuhan University of Hydraulic and Electric EngineeringWuhanChina

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