The conditions for the appearance of instabilities in systems of helical vortices constitute an intriguing problem that still remains partly unsolved. The experimental study of Felli, Camussi & Di Felice (J. Fluid Mech., this issue, vol. 682, 2011, pp. 5-53) has shed new light on some of the basic mechanisms governing the instability mechanisms.
Bibliographical note© Cambridge University Press 2011
- Vortex instability