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Mélange d'interfaces de densité en écoulements de Taylor - Couette

Abstract : The aim of this work is to study the mixing of stratified
fluid by anisotropic turbulent flows. It's part of a larger project on the mixing of the ocean upper layer. Details on the mixing have been obtained using measurements on the evolution of a two-layer Taylor -
Couette flow. In the laminar regime, the vertical transport in the homogeneous layer is smaller than the interfacial flux and several density interfaces appear at different heights. Their interaction (bifurcation or merging) controle the subsequent density flux. In the turbulent regime, the results compare well with the literature on mixing : The relation between density flux and density gradient
exhibit a maximum for a Richardson number RIO = 10, and an increase in efficiency is observed for high RIO, corresponding to the theory of Balmforth (1998). For these high RIO, observations highlight the presence of wave-breaking events and related small-scale turbulence near and within the interface.
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https://tel.archives-ouvertes.fr/tel-00081798
Contributor : Estelle Guyez <>
Submitted on : Monday, June 26, 2006 - 10:37:24 AM
Last modification on : Thursday, November 19, 2020 - 3:54:10 PM
Long-term archiving on: : Monday, April 5, 2010 - 9:31:45 PM

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  • HAL Id : tel-00081798, version 1

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Citation

Estelle Guyez. Mélange d'interfaces de densité en écoulements de Taylor - Couette. Hydrologie. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00081798⟩

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