Leapfrogging Kelvin waves
Fluid Dynamics
2016-12-14 v2 Other Condensed Matter
Abstract
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 simpified model that provides an analytical approximation developed for nearly parallel vortices. Our results are also relevant to thin-cored helical vortices in classical fluids.
Cite
@article{arxiv.1603.06403,
title = {Leapfrogging Kelvin waves},
author = {N. Hietala and R. Hänninen and H. Salman and C. F. Barenghi},
journal= {arXiv preprint arXiv:1603.06403},
year = {2016}
}