[Dynamique des fluides d’un système mixte convectif / stablement stratifié — Une revue de quelques travaux récents]
De nombreux systèmes fluides s’organisent en une couche turbulente adjacente à une couche stratifiée stable, comme par exemple les atmosphères planétaires et les intérieurs stellaires. La compréhension des échanges d’énergie et de quantité de mouvement à l’interface entre ces deux couches, et l’appréhension de leur dynamique couplée sont difficiles, en raison de la grande gamme d’échelles de temps et de longueur impliquées : en effet, la turbulence rapide à petite échelle excite des ondes à moyenne échelle, qui se propagent et interagissent non linéairement pour générer des circulations à grande échelle, dont le plus célèbre exemple est l’oscillation quasibiennale de l’atmosphère terrestre. Dans cet article, nous passons en revue quelques progrès récents sur la caractérisation des ondes et sur la génération non-linéaire d’un écoulement moyen, obtenus par l’étude combinée, expérimentale et numérique, d’une configuration modèle au laboratoire. Les conséquences possibles de nos résultats pour la modélisation climatique et stellaire sont aussi brièvement discutées.
Numerous fluid systems organise into a turbulent layer adjacent to a stably stratified one, for instance, planetary atmospheres and stellar interiors. Capturing the coupled dynamics of such systems and understanding the exchanges of energy and momentum at the interface between the two layers are challenging, because of the large range of involved time- and length-scales: indeed, the rapid small-scale turbulence excites waves at intermediate scale, which propagate and interact non-linearly to generate large-scale circulations, whose most famous example is the quasi-biennial oscillation of the Earth’s atmosphere. We review here some recent progress on the wave characterisation and on the non-linear mean flow generation, based on the combined experimental and numerical study of a model laboratory system. Applications in climate and stellar modelling are also briefly discussed.
Keywords: Internal gravity waves, Convection, Wave—mean flow interactions, Quasi-biennial oscillation (QBO), Atmospheric and stellar dynamics
Mot clés : Ondes internes de gravité, Convection, Interactions ondes — écoulemement moyen, Oscillation quasi-biennale, Dynamique atmosphérique et stellaire
Michael Le Bars 1 ; Louis-Alexandre Couston 1 ; Benjamin Favier 1 ; Pierre Léard 1 ; Daniel Lecoanet 2 ; Patrice Le Gal 1
CC-BY 4.0
@article{CRPHYS_2020__21_2_151_0,
author = {Michael Le Bars and Louis-Alexandre Couston and Benjamin Favier and Pierre L\'eard and Daniel Lecoanet and Patrice Le Gal},
title = {Fluid dynamics of a mixed convective/stably stratified {system{\textemdash}A} review of some recent works},
journal = {Comptes Rendus. Physique},
pages = {151--164},
publisher = {Acad\'emie des sciences, Paris},
volume = {21},
number = {2},
year = {2020},
doi = {10.5802/crphys.17},
language = {en},
}
TY - JOUR AU - Michael Le Bars AU - Louis-Alexandre Couston AU - Benjamin Favier AU - Pierre Léard AU - Daniel Lecoanet AU - Patrice Le Gal TI - Fluid dynamics of a mixed convective/stably stratified system—A review of some recent works JO - Comptes Rendus. Physique PY - 2020 SP - 151 EP - 164 VL - 21 IS - 2 PB - Académie des sciences, Paris DO - 10.5802/crphys.17 LA - en ID - CRPHYS_2020__21_2_151_0 ER -
%0 Journal Article %A Michael Le Bars %A Louis-Alexandre Couston %A Benjamin Favier %A Pierre Léard %A Daniel Lecoanet %A Patrice Le Gal %T Fluid dynamics of a mixed convective/stably stratified system—A review of some recent works %J Comptes Rendus. Physique %D 2020 %P 151-164 %V 21 %N 2 %I Académie des sciences, Paris %R 10.5802/crphys.17 %G en %F CRPHYS_2020__21_2_151_0
Michael Le Bars; Louis-Alexandre Couston; Benjamin Favier; Pierre Léard; Daniel Lecoanet; Patrice Le Gal. Fluid dynamics of a mixed convective/stably stratified system—A review of some recent works. Comptes Rendus. Physique, Volume 21 (2020) no. 2, pp. 151-164. doi : 10.5802/crphys.17. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.17/
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