科研之友
微信
新浪微博
Facebook
分享链接
摘要
The transition to turbulence in the incompressible flow around a NACA0012 wing at high incidence is studied by DNS in the Reynolds number range 800-10000. Two main routes are identified for the two-dimensional transition mechanisms: that to aperiodicity beyond the von Karman mode via a period-doubling scenario and the development of a shear-layer instability, forced by the fundamental oscillation of the separation point downstream of the leading edge. The evolution of the global parameters as well as the variation law of the shear-layer instability wavelength are quantified. The history of the three-dimensional transition mechanisms from a nominally two-dimensional flow structure is identified beyond the first bifurcation, as well as the preferred spanwise wavelengths.
- 出版日期2003-12-10
