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Experimental evidence of a triadic resonance of plane inertial waves in a rotating fluid

Abstract : Plane inertial waves are generated using a wavemaker, made of oscillating stacked plates, in a rotating water tank. Using particle image velocimetry, we observe that, after a transient, the primary plane wave is subject to a subharmonic instability and excites two secondary plane waves. The measured frequencies and wavevectors of these secondary waves are in quantitative agreement with the predictions of the triadic resonance mechanism. The secondary wavevectors are found systematically more normal to the rotation axis than the primary wavevector: this feature illustrates the basic mechanism at the origin of the energy transfers towards slow, quasi two-dimensional, motions in rotating turbulence.
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Contributor : Pierre-Philippe Cortet <>
Submitted on : Saturday, December 17, 2011 - 4:08:22 PM
Last modification on : Thursday, December 10, 2020 - 12:30:56 PM
Long-term archiving on: : Sunday, March 18, 2012 - 2:21:22 AM

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Guilhem Bordes, Frederic Moisy, Thierry Dauxois, Pierre-Philippe Cortet. Experimental evidence of a triadic resonance of plane inertial waves in a rotating fluid. Physics of Fluids, American Institute of Physics, 2012, 24, pp.014105. ⟨10.1063/1.3675627⟩. ⟨hal-00653091⟩

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