Abstract
We consider the equations of motion of n vortices of equal circulation in the plane, in a disk and on a sphere. The vortices form a polygonal equilibrium in a rotating frame of reference. We use numerical continuation in a boundary value setting to determine the Lyapunov families of periodic orbits that arise from the polygonal relative equilibrium. When the frequency of a Lyapunov orbit and the frequency of the rotating frame have a rational relationship, the orbit is also periodic in the inertial frame. A dense set of Lyapunov orbits, with frequencies satisfying a Diophantine equation, corresponds to choreographies of n vortices. We include numerical results for all cases, for various values of n, and we provide key details on the computational approach.
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Calleja, R.C., Doedel, E.J. & García-Azpeitia, C. Choreographies in the n-vortex Problem. Regul. Chaot. Dyn. 23, 595–612 (2018). https://doi.org/10.1134/S156035471805009X
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DOI: https://doi.org/10.1134/S156035471805009X