Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session P39: Francois Frenkiel Award Talk |
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Chair: Nathalie Vriend, University of Cambridge Room: Georgia World Congress Center Thomas Murphy Ballroom 3/4 |
Tuesday, November 20, 2018 11:20AM - 11:40AM |
P39.00001: Francois Frenkiel Award Talk: Universal and nonuniversal aspects of vortex reconnections in superfluids Invited Speaker: Alberto Villois Vortex reconnections play a fundamental role in fluid dynamics: understanding this mechanism sheds new light on how energy is transferred through scales and how topological fluid dynamical properties are modified. In superfluids, vortices are topological defects with quantised values of circulation. Despite the lack of dissipation, quantised vortices do reconnect in superfluids because the fluid density vanishes at the vortex core. We will explain how reconnection events occur in the Gross—Pitaevskii equation, a general model of superfluid, studying different vortex configurations. Through asymptotic theory and numerical simulations we will demonstrate what are the universal and non-universal aspects of superfluid vortex reconnections. Finally, we will present some recent results on how vortex energy is dissipated into sound excitations during a reconnection event. |
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