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Article Dans Une Revue Physical Review Letters Année : 2020

Quantitative Experimental Observation of Weak Inertial-Wave Turbulence

Résumé

We report the quantitative experimental observation of the weak inertial-wave turbulence regime of rotating turbulence. We produce a statistically steady homogeneous turbulent flow that consists of nonlinearly interacting inertial waves, using rough top and bottom boundaries to prevent the emergence of a geostrophic flow. As the forcing amplitude increases, the temporal spectrum evolves from a discrete set of peaks to a continuous spectrum. Maps of the bicoherence of the velocity field confirm such a gradual transition between discrete wave interactions at weak forcing amplitude and the regime described by weak turbulence theory (WTT) for stronger forcing. In the former regime, the bicoherence maps display a near-zero background level, together with sharp localized peaks associated with discrete resonances. By contrast, in the latter regime, the bicoherence is a smooth function that takes values of the order of the Rossby number in line with the infinite-domain and random-phase assumptions of WTT. The spatial spectra then display a power-law behavior, both the spectral exponent and the spectral level being accurately predicted by WTT at high Reynolds number and low Rossby number.
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Dates et versions

hal-03065201 , version 1 (14-12-2020)

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Eduardo Monsalve, Maxime Brunet, Basile Gallet, Pierre-Philippe Cortet. Quantitative Experimental Observation of Weak Inertial-Wave Turbulence. Physical Review Letters, 2020, 125, pp.254502. ⟨10.1103/PhysRevLett.125.254502⟩. ⟨hal-03065201⟩
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