Abstract
The development of the separated shear flows about rectangular and circular cylinders is investigated in the Reynolds number range 3000 less than 9000 by means of flow visualisation with hydrogen bubbles and velocity measurement with a hot-film anemometer. The results elucidate some interesting features of the three-dimensional flow in the nonlinear stage of the transition to turbulence. The small-scale spanwise vortices formed in the separated flow undergo strong distortion and merge into a large-scale Strouhal vortex. The interaction between spanwise vortices is closely associated with the spectral properties of velocity fluctuations. The pair of the counter-rotation streamwise vortices are detected between the large-scale spanwise vortices in the near wake of the cylinder.
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