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Séminaire Michael Benzaquen

6 mars 2015

Waves and wakes

Michael Benzaquen - Laboratoire Gulliver UMR CNRS 7083, ESPCI ParisTech PSL Research University

Mercredi 8 Avril à 16 h 00 - Amphithéâtre Nougaro

Résumé :

Simply by looking at a duck swimming in a pond or a cargo ship moving on a calm sea, one can clearly tell that there is something common about their wake. Indeed, they both display a familiar V-shaped pattern which only differ from one another by their dimensions. In 1887, Lord Kelvin was able to provide a theory to explain the ship-wave pattern. His most popular achievement was to prove that the wake created by a disturbance moving at a uniform pace is always delimited by a straight wedge with half-angle 19.5 degrees, independent of the velocity of the disturbance. Recently, Kelvin’s century old and well accepted theory was challenged [1], by that drawing the attention of the fluid dynamics community [2,3]…

[1] M. Rabaud and F. Moisy, Phys. Rev. Lett. 110 (2013) 214503
[2] A. Darmon, M. Benzaquen and E. Raphael, J. Fluid Mech. 738 (2014) R3
[3] M. Benzaquen, A.Darmon and E. Raphael, Physics of Fluids 26 (2014) 092106

Séminaire du groupe Interface