Abstract
Experimental study was carried out under a constant Reynolds number (Red = 2×104). The minimum clearance, where the vortex shedding from the cylinder disappeared, was fount not to be affected by the thickness of the turbulent boundary layer. As the boundary layer became thicker, the vortex shedding frequency (f) became highly dependent on the clearance between the cylinder and the flat plate, while there appeared to be a region where f = const. The positions of separation or reattachment were accurately decided, and thus the flows were classified into four types. It was made clear that the recirculation zone and its scale correlated to the mechanism of separation at the flat surface just behind the cylinder, and that the discrete change in this separation position occurred at the minimum clearance where the vortex shedding disappeared.
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