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- W4308343459 abstract "The $m$-waves of Kelvin are uniformly rotating patch solutions of the 2D Euler equations with $m$-fold rotational symmetry for $mgeq 2$. For Kelvin waves sufficiently close to the disc, we prove a nonlinear stability result up to an arbitrarily long time in the $L^1$ norm of the vorticity, for $m$-fold symmetric perturbations. To obtain this result, we first prove that the Kelvin wave is a strict local maximizer of the energy functional in some admissible class of patches, which had been claimed by Wan in 1986. This gives an orbital stability result with a support condition on the evolution of perturbations, but using a Lagrangian bootstrap argument which traces the particle trajectories of the perturbation, we are able to drop the condition on the evolution. Based on this unconditional stability result, we establish that long time filamentation, or formation of long arms, occurs near the Kelvin waves, which have been observed in various numerical simulations. Additionally, we discuss stability of annular patches in the same variational framework." @default.
- W4308343459 created "2022-11-11" @default.
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- W4308343459 date "2022-04-07" @default.
- W4308343459 modified "2023-09-30" @default.
- W4308343459 title "Stability and instability of Kelvin waves" @default.
- W4308343459 doi "https://doi.org/10.48550/arxiv.2204.03199" @default.
- W4308343459 hasPublicationYear "2022" @default.
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