Scattering of Line-Ring Vortices in a Superfluid

Alberto Villois, Hayder Salman, Davide Proment

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Abstract

We study the scattering of vortex rings by a superfluid line vortex using the Gross-Pitaevskii equation in a parameter regime where a hydrodynamic description based on a vortex filament approximation is applicable. By using a vortex extraction algorithm, we are able to track the location of the vortex ring as a function of time. Using this, we show that the scattering of the vortex ring in our Gross-Pitaevskii simulations is well captured by the local induction approximation of a vortex filament model for a wide range of impact parameters. The scattering of a vortex ring by a line vortex is characterised by the initial offset of the centre of the ring from the axis of the vortex. We find that a strong asymmetry exists in the scattering of a ring as a function of this initial scattering parameter.
Original languageEnglish
Pages (from-to)68-81
JournalJournal of Low Temperature Physics
Volume180
Issue number1-2
Early online date6 May 2015
DOIs
Publication statusPublished - 2015

Keywords

  • physics.flu-dyn
  • cond-mat.other

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