Experiments in Fluids

, Volume 26, Issue 3, pp 188–196

On the spatio-temporal structure of cylinder wakes

  • I. Peschard
  • P. Le Gal
  • Y. Takeda

DOI: 10.1007/s003480050279

Cite this article as:
Peschard, I., Le Gal, P. & Takeda, Y. Experiments in Fluids (1999) 26: 188. doi:10.1007/s003480050279

Abstract

The wake of a short aspect ratio cylinder placed in a uniform flow is experimentally investigated. After having characterized the temporal behavior of the Bénard–Von Kàrmàn vortex shedding by the use of a classical hot-wire anemometer, an ultrasound anemometry technique is applied to study the spatial critical behavior of the envelope of the transverse velocity of the wake. It is shown that this envelope which represents the spatial form of the global mode of the wake, follows universal scaling laws which are in agreement with a second order phase transition. In a second set of experiments, the behavior of the longitudinal velocity fluctuations is also investigated. It is discovered that there is a special point several diameters behind the cylinder, which plays a role of a wave maker. Finally, for very small aspect ratio cylinders, symmetric vortex shedding is reported and interpreted using a system of coupled oscillators.

Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • I. Peschard
    • 1
  • P. Le Gal
    • 1
  • Y. Takeda
    • 2
  1. 1.Institut de Recherche sur les Phénomènes Hors Equilibre UM 6594, CNRS-Universités d’Aix-Marseille I & II 12, Avenue Général Leclerc, F-13003 Marseille, FranceFR
  2. 2.Laboratory for Spallation Neutron Source Paul Scherrer Institute CH-5232 Villigen PSI, SwitzerlandCH