Two vortex rings can form a localized configuration whereby they continually pass through one another in an alternating fashion. This phenomenon is called leapfrogging. Using parameters suitable for superfluid helium-4, we describe a recurrence phenomenon that is similar to leapfrogging, which occurs for two coaxial straight vortex filaments with the same Kelvin wave mode. For small-amplitude Kelvin waves we demonstrate that our full Biot-Savart simulations closely follow predictions obtained from a simplified model that provides an analytical approximation developed for nearly parallel vortices. Our results are also relevant to thin-cored helical vortices in classical fluids.
|Journal||Physical Review Fluids|
|Publication status||Published - 5 Dec 2016|
- School of Mathematics - Associate Professor in Applied Mathematics
- Centre for Photonics and Quantum Science - Member
- Quantum Fluids - Member
Person: Research Group Member, Academic, Teaching & Research