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From coherent shocklets to giant collective incoherent shock waves in nonlocal turbulent flows

Abstract : Understanding turbulent flows arising from random dispersive waves that interact strongly through nonlinearities is a challenging issue in physics. Here we report the observation of a characteristic transition: strengthening the nonlocal character of the nonlinear response drives the system from a fully turbulent regime, featuring a sea of coherent small-scale dispersive shock waves (shocklets) towards the unexpected emergence of a giant collective incoherent shock wave. The front of such global incoherent shock carries most of the stochastic fluctuations and is responsible for a peculiar folding of the local spectrum. Nonlinear optics experiments performed in a solution of graphene nano-flakes clearly highlight this remarkable transition. Our observations shed new light on the role of long-range interactions in strongly nonlinear wave systems operating far from thermodynamic equilibrium, which reveals analogies with, for example, gravitational systems, and establishes a new scenario that can be common to many turbulent flows in photonic quantum fluids, hydrodynamics and Bose–Einstein condensates.
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https://hal.archives-ouvertes.fr/hal-01263734
Contributor : Serena Benassù <>
Submitted on : Thursday, January 28, 2016 - 10:49:26 AM
Last modification on : Friday, March 27, 2020 - 3:01:47 AM

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G. Xu, D. Vocke, D. Faccio, J. Garnier, T. Roger, et al.. From coherent shocklets to giant collective incoherent shock waves in nonlocal turbulent flows. Nature Communications, Nature Publishing Group, 2015, 6, n°8131 - 10 p. ⟨10.1038/ncomms9131⟩. ⟨hal-01263734⟩

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