Abstract
Vortex shedding from a transversely oscillating circular cylinder in a uniform flow is studied by numerical solutions of the two-dimensional unsteady Navier-Stokes equations with a primitive-variable formulation. As the frequency of excitation of the cylinder is increased relative to the inherent vortex formation frequency, the initially formed concentration of vorticity moves closer to the cylinder until a limiting position is reached; at this point, the vorticity concentration abruptly switches to the opposite side of the cylinder. This process induces distinct changes of the topology of the corresponding streamline patterns. In addition, the influence of this vorticity-switching on forces acting on the cylinder is also investigated.
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