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A simple demonstration of shear-flow instability

Physics Education 2021-01-06 v3 Atmospheric and Oceanic Physics Fluid Dynamics

Abstract

We describe a simple classroom demonstration of a fluid-dynamic instability. The demonstration requires only a bucket of water, a piece of string and some used tealeaves or coffee grounds. We argue that the mechanism for the instability, at least in its later stages, is two-dimensional barotropic (shear-flow) instability and we present evidence in support of this. We show results of an equivalent basic two-dimensional numerical non-linear model, which simulates behavior comparable to that observed in the bucket demonstration. Modified simulations show that the instability does not depend on the curvature of the domain, but rather on the velocity profile.

Keywords

Cite

@article{arxiv.2003.13252,
  title  = {A simple demonstration of shear-flow instability},
  author = {Tom Howard and Ana Barbosa Aguiar},
  journal= {arXiv preprint arXiv:2003.13252},
  year   = {2021}
}

Comments

22 pages, 8 figures. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in American Journal of Physics 88, Issue 12, 1041 (2020) and may be found at https://doi.org/10.1119/10.0002438

R2 v1 2026-06-23T14:31:26.940Z