Abstract
We bring new results in the study of the asymptotic behavior of shrinking vortex pairs obtained by maximization of the kinetic energy in a 2-dimensional lake over a class of rearrangements. After improving recent results obtained for the first order asymptotic behavior of such pairs, we focus on second order asymptotic properties. We show that among all points of maximal depth, the vortex locates according to an adaptation of the Kirchoff--Routh function, and we study the asymptotic shape of optimal vortices. We also explore a relaxed maximization problem with uniform constraints, for which we prove that the distribution consists of two vortex patches.
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