UNSPECIFIED (1996) Three-dimensional Floquet stability analysis of the wake of a circular cylinder. JOURNAL OF FLUID MECHANICS, 322 . pp. 215-241. ISSN 0022-1120

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Abstract

Results are reported from a highly accurate, global numerical stability analysis of the periodic wake of a circular cylinder for Reynolds numbers between 140 and 300. The analysis shows that the two-dimensional wake becomes (absolutely) linearly unstable to three-dimensional perturbations at a critical Reynolds number of 188.5 +/- 1.0. The critical spanwise wavelength is 3.96 +/- 0.02 diameters and the critical Floquet mode corresponds to a 'Mode A' instability. At Reynolds number 259 the two-dimensional wake becomes linearly unstable to a second branch of modes with wavelength 0.822 diameters at onset. Stability spectra and corresponding neutral stability curves are presented for Reynolds numbers up to 300.

Item Type:	Journal Article
Subjects:	T Technology > TJ Mechanical engineering and machinery Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF FLUID MECHANICS
Publisher:	CAMBRIDGE UNIV PRESS
ISSN:	0022-1120
Date:	10 September 1996
Volume:	322
Number of Pages:	27
Page Range:	pp. 215-241
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/18383

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