Dynamical characteristics of coherent structure in the outer region of turbulence boundary layer
- 8 Downloads
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 Wordsouter region of turbulence boundary layer coherent structure lateral vortices
Unable to display preview. Download preview PDF.
- 6.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: 115–120Google Scholar
- 8.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. 326–329Google Scholar
- 9.Hussian AKM. Coherent Structure—Reality and Myth.Phys Fluid, 1983, 26(10)Google Scholar