期刊
JOURNAL OF FLUID MECHANICS
卷 804, 期 -, 页码 513-530出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2016.565
关键词
turbulent boundary layers; turbulent flows; wakes
资金
- European Research Council (ERC) [277472]
- Engineering and Physical Sciences Research Council of the United Kingdom (EPSRC) [EP/1037717/1]
- Leverhulme Trust
- Natural Sciences and Engineering Research Council of Canada (NSERC)
The influence of turbulence on the flow around a wall-mounted cube immersed in a turbulent boundary layer is investigated experimentally with particle image velocimetry and hot-wire anemometry. Free-stream turbulence is used to generate turbulent boundary layer profiles where the normalised shear at the cube height is fixed, but the turbulence intensity at the cube height is adjustable. The free-stream turbulence is generated with an active grid and the turbulent boundary layer is formed on an artificial floor in a wind tunnel. The boundary layer development Reynolds number (Re-x) and the ratio of the cube height (h) to the boundary layer thickness (delta) are held constant at Re-x = 1.8 x 10(6) and h/delta = 0.47. It is demonstrated that the stagnation point on the upstream side of the cube and the reattachment length in the wake of the cube are independent of the incoming profile for the conditions investigated here. In contrast, the wake length monotonically decreases for increasing turbulence intensity but fixed normalised shear - both quantities measured at the cube height. The wake shortening is a result of heightened turbulence levels promoting wake recovery from high local velocities and the reduction in strength of a dominant shedding frequency.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据