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États limites et bouffées turbulentes en conduite cylindrique

Published online by Cambridge University Press:  15 September 2010

Yoann Duguet*
Affiliation:
Laboratoire d’Informatique pour la Mécanique et les Sciences de l’Ingénieur (LIMSI-CNRS), UPR 325, BP 133, 91403 Orsay Cedex, France School of Mathematics, University of Bristol BS8 1TW, Bristol, UK
A. P. Willis
Affiliation:
LadHyX, École Polytechnique, 91128 Palaiseau, France School of Mathematics, University of Bristol BS8 1TW, Bristol, UK
R. R. Kerswell
Affiliation:
School of Mathematics, University of Bristol BS8 1TW, Bristol, UK
*
a Auteur pour correspondance : duguet@mech.kth.se
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Abstract

La transition vers la turbulence en conduite cylindrique est observée pour Re assez grand, malgre la stabilité linéaire de l’état laminaire. Expérimentalement, la transition se manifeste par le développement de bouffées turbulentes, spatialement localisées. Du côté théorique, des ondes progressives, instables et de courte longueur d’onde, ont été mises en évidence numériquement. Cette étude, qui utilise la simulation numérique directe ainsi qu’un modèle réduit, suggère la compatibilité entre les deux approches.

Type
Research Article
Copyright
© AFM, EDP Sciences 2010

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