ASYMMETRIC VORTEX PAIR IN THE WAKE OF A CIRCULAR-CYLINDER

Stationary configurations of two asymmetric point vortices in the wake of an infinite circular cylinder, spinning or not about its axis, are analytically investigated using an ideal fluid approximation. Four di fferent vortex configurations (patterns) in the wake of a spinning cyl inder are found in the case when vortex asymmetry is weak; each config uration is associated with a certain direction of the Magnus force. Th e qualitative relation between a pattern and a direction of the Magnus force is in agreement with experimental data. Also obtained are asymm etrical vortex configurations in the wake of a nonspinning cylinder.