Collision of almost parallel vortex filaments

Abstract : We investigate the occurrence of collisions in the evolution of vortex filaments through a system introduced by Klein, Majda and Damodaran [KMD95] and Zakharov [Z88, Z99]. We first establish rigorously the existence of a pair of almost parallel vortex filaments, with opposite circulation, colliding at some point in finite time. The collision mechanism is based on the one of the self-similar solutions of the model, described in [BFM14]. In the second part of this paper we extend this construction to the case of an arbitrary number of filaments, with poly-gonial symmetry, that are perturbations of a configuration of parallel vortex filaments forming a polygon, with or without its center, rotating with constant angular velocity.
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Submitted on : Thursday, July 2, 2015 - 3:12:01 PM
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Valeria Banica, Erwan Faou, Evelyne Miot. Collision of almost parallel vortex filaments. Communications on Pure and Applied Mathematics, Wiley, 2017, 70 (2), pp.378-405. ⟨10.1002/cpa.21637⟩. ⟨hal-01170929⟩

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