Periodic wakes of low aspect ratio cylinders with free hemispherical ends

Citation
L. Schouveiler et M. Provansal, Periodic wakes of low aspect ratio cylinders with free hemispherical ends, J FLUID STR, 15(3-4), 2001, pp. 565-573
Citations number
25
Categorie Soggetti
Mechanical Engineering
Journal title
JOURNAL OF FLUIDS AND STRUCTURES
ISSN journal
08899746 → ACNP
Volume
15
Issue
3-4
Year of publication
2001
Pages
565 - 573
Database
ISI
SICI code
0889-9746(200104/05)15:3-4<565:PWOLAR>2.0.ZU;2-H
Abstract
The wakes of circular cylinders with free hemispherical ends and of differe nt aspect ratios (length-to-diameter ratios) are experimentally studied for moderate Reynolds numbers. This investigation is restricted to cylinders w ith low aspect ratios, namely less than 5, and includes the case of the sph ere. The transition to nonstationarity of the how in these cylinder wakes i s the main focus of this work: the results show that the stability of wakes is strongly dependent on aspect ratio and is also affected by the free-end conditions. We characterize the frequency, amplitude and phase as well as the critical Reynolds number of the periodic vortex shedding regime. (C) 20 01 Academic Press.