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Faraday pilot-wave dynamics in a circular corral

Published online by Cambridge University Press:  18 March 2020

Matthew Durey*
Affiliation:
Department of Mathematical Sciences, University of Bath, BathBA2 7AY, UK Department of Mathematics, Massachusetts Institute of Technology, Cambridge, MA02139, USA
Paul A. Milewski
Affiliation:
Department of Mathematical Sciences, University of Bath, BathBA2 7AY, UK
Zhan Wang
Affiliation:
Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing100190, PR China
*
Email address for correspondence: mdurey@mit.edu

Abstract

A millimetric droplet of silicone oil may bounce and self-propel on the free surface of a vertically vibrating fluid bath due to the droplet’s interaction with its accompanying Faraday wave field. This hydrodynamic pilot-wave system exhibits many dynamics that were previously thought to be peculiar to the quantum realm. When the droplet is confined to a circular cavity, referred to as a ‘corral’, a range of dynamics may occur depending on the details of the geometry and the decay time of the subcritical Faraday waves. We herein present a theoretical investigation into the behaviour of subcritical Faraday waves in this geometry and explore the accompanying pilot-wave dynamics. By computing the Dirichlet-to-Neumann map for the velocity potential in the corral geometry, we can evolve the quasi-potential flow between successive droplet impacts, which, when coupled with a simplified model for the droplet’s vertical motion, allows us to derive and implement a highly efficient discrete-time iterative map for the pilot-wave system. We study the onset of the Faraday instability, the emergence and quantisation of circular orbits and simulate the exotic dynamics that arises in smaller corrals.

Type
JFM Papers
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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