Zc. Liang, DYNAMICAL CHARACTERISTICS OF COHERENT STRUCTURE IN THE OUTER REGION OF TURBULENCE BOUNDARY-LAYER, Acta Mechanica Sinica, 12(4), 1996, pp. 289-295
In the present paper the coherent structures in the outer region of tu
rbulent boundary layer were investigated experimentally and analytical
ly. From the observation of the how field over smooth wall, rough wall
and sand wave wall, it was found that the direct effect of wall on th
e flow structure can reach y(+1) approximate to 100, and both lateral
and vertical vortices exist in the outer region, but the coherent stru
ctures in the outer region are mainly the formation, development and d
ecay of the large-scale lateral vortices. By experimental and dynamica
l analysis, some influence factors and their relations associated with
the dynamical process of lateral vortices were deduced.