Abstract
A formation mechanism of alternating vortices behind a circular cylinder has been examined experimentally at a Reynolds number of 1.7 × 10 5 (based on the diameter of the cylinder) and at a Mach number of 0.391, and has been proposed on the basis of the present results as well as on existing knowledge. Asymmetry of the vortex pair with respect to the wake axis behind the cylinder and the cross-flow through the axis are necessary precursors for alternate vortex shedding. These result in an unstable vortex system consisting of three vortices in the vortex formation region, so that another stable vortex system of a new vortex pair is formed by shedding one of the three vortices downstream. However, the vortex pair is unstable for the asymmetrical disturbances, and thus cross-flow through the wake axis is again induced. It is inferred that this cyclic process maintains the alternate vortex shedding behind the cylinder.
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