Wake Instabilities Behind Bluff Bodies
Identifieur interne : 000C18 ( France/Analysis ); précédent : 000C17; suivant : 000C19Wake Instabilities Behind Bluff Bodies
Auteurs : Michel Provansal [France]Source :
- Springer Tracts in Modern Physics [ 0081-3869 ] ; 2006.
Abstract
Abstract: The observation by Bénard of a vortex street in the wake of a circular cylinder has been commonly associated with the stability analysis of the double alternate street proposed by von Kármán. After a short historical review of these studies, we present the main progress in understanding this instability during the last decade. New experiments and the control of two-dimensional flows have clarified the source of different modes as well as the results of three-dimensional numerical simulations. The introduction of new concepts (absolute and convective instabilities) allows us to link the velocity defect in the wake to the mechanism of formation of the vortex street. The dynamics of the wake has been successfully compared to the nonlinear Landau and Ginzburg-Landau models. Besides the configuration of the circular cylinder wake, we describe different kinds of bluff bodies and the diversity of their applications.
Url:
DOI: 10.1007/978-0-387-25111-0_10
Affiliations:
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