[Un éclairage sur les écoulements turbulents par lʼétude de tétrades lagrangiennes]
La connaissance trop partielle des mécanismes de génération des petites échelles dans les écoulements turbulents est une sérieuse entrave à la compréhension et à la prédiction quantitative de nombreux problèmes physiques, appliqués ou fondamentaux, et nécessite donc dʼutiliser de nouvelles approches. Nous passons en revue les informations qui peuvent être obtenues en suivant le mouvement de quelques traceurs dans un écoulement turbulent. Cette approche, qui a montré son efficacité dans lʼétude de la dispersion dʼun scalaire passif transporté par la turbulence, a conduit à un éclairage nouveau sur quelques-uns des phénomènes surprenants observés dans des écoulements turbulents, tels que lʼalignement de la vorticité avec les vecteurs propres du tenseur de taux de déformation. De récents travaux ont porté sur le mouvement de quatre particules formant initialement une tétrade régulière de taille . Les perspectives de modélisation inspirées par cette approche sont présentées et discutées.
The insufficient understanding of the generation of small scales in turbulent flows results in serious impediment when trying to describe numerous physical problems, of natural or applied significance, and therefore, calls for new approaches. Here, we discuss the insight that can be gained by following the motion of a few points in a turbulent flow. This approach, which has shown its power in the context of the problem of dispersion of a passive scalar transported by turbulence, has led to new insight into some of the intriguing phenomena observed in turbulent flows, such as the alignment of vorticity with the eigenvectors of the rate of strain tensor. Recent work has focused on the motion of four points, forming initially a regular tetrad of size . In particular, the modeling perspective inspired by the tetrad approach will be discussed here.
Mot clés : Turbulence, Structure de lʼécoulement, Dépendance dʼéchelle, Modélisation
Alain Pumir 1 ; Aurore Naso 2
@article{CRPHYS_2012__13_9-10_889_0,
author = {Alain Pumir and Aurore Naso},
title = {Insight on turbulent flows from {Lagrangian} tetrads},
journal = {Comptes Rendus. Physique},
pages = {889--898},
publisher = {Elsevier},
volume = {13},
number = {9-10},
year = {2012},
doi = {10.1016/j.crhy.2012.09.001},
language = {en},
}
Alain Pumir; Aurore Naso. Insight on turbulent flows from Lagrangian tetrads. Comptes Rendus. Physique, Volume 13 (2012) no. 9-10, pp. 889-898. doi : 10.1016/j.crhy.2012.09.001. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2012.09.001/
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