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Wave turbulence
MSC : L. Deike (PhD), B. Issenmann (Postdoc), F. Boyer (M2), E. Herbert (Post-doc), M. Berhanu, C. Laroche, E. Falcon
Collaborations : ENS Paris, ENS Lyon, CEA Saclay, EC Nantes, Univ. Santiago (Chili)
Wave turbulence concerns the study of a set of numerous interacting waves. This is an ubiquitous phenomenon that occurs in various situations from spin waves in solids, internal or surface waves in oceanography up to plasma waves in astrophysics. Wave turbulence theory, also called weak turbulence, assumes that the energy transfer is governed by resonant interaction between waves leading to an energy cascade from large (forcing) scales up to small (dissipative) ones. Although this theory can be applied to nearly all fields of physics involving weakly nonlinear waves, few well controlled laboratory experiments exist. We experimentally study wave turbulence on the surface of a fluid to better understand the basic mechanisms of energy transfer between waves. We characterize the dynamical and statistical properties of wave turbulence by measuring the time-space wave spectrum, the probability distribution of wave amplitudes, and the fluctuations of injected power into the system. We also observe an intermittency regime, a purely capillary wave turbulence in low-gravity environment, and a magnetic wave turbulent regime on the surface of a magnetic fluid. We currently focus on dissipative processes and correlation between waves involved in wave turbulence. Experiments in large scales basin (50 m x 40 m x 5m) should also begin very soon.
Nom des membres actuels ou anciens
FALCON Éric, LAROCHE Claude, BOYER François, BERHANU Michaël, DEIKE Luc, ISSENMANN Bruno, HERBERT Éric
General keyword
Teams
Keywords
- Wetting, capilarity, dynamics of fluid interfaces
- Out of equilibrium dynamic systems and nonlinear physics
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