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An exploration of the wake three dimensionalities caused by a local discontinuity in cylinder diameter

Lewis, C. G. and Gharib, M. (1992) An exploration of the wake three dimensionalities caused by a local discontinuity in cylinder diameter. Physics of Fluids A, 4 (1). pp. 104-117. ISSN 0899-8213. https://resolver.caltech.edu/CaltechAUTHORS:20130913-104900084

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Abstract

The wake three‐dimensionality caused by a local discontinuity in cylinder diameter (a stepped cylinder) was studied. Changes in vortex shedding frequency caused by the discontinuity took place in either a direct or an indirect mode, depending on the diameter ratio and the Reynolds number. The roles of oblique shedding and frequency modulation of vortex shedding were studied. The physical change in vortex shedding frequency occurred differently for each mode. A wavelet analysis is used to explore frequency modulations in the wake. The relationship between vortex linkages, frequency changes, secondary instability, and these two modes is discussed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.858489 DOIArticle
http://pof.aip.org/resource/1/pfadeb/v4/i1/p104_s1PublisherArticle
Additional Information:© 1991 American Institute of Physics. Received 14 November 1990; accepted 19 September 1991. We wish to thank Professor F. Browand for suggesting the use of the wavelet transform in this study and for helpful discussion and comments. This work was supported by the Ocean Engineering Division of ONR, Grant No. N00014-90-J-1314, and by DARPA/URI Grant No. N00014-86-K-0758.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR) Ocean Engineering DivisionN00014-90-J-1314
DARPA/URIN00014-86-K-0758
Subject Keywords:WAKES, CYLINDERS, VORTICES, REYNOLDS NUMBER, FREQUENCY MODULATION, END EFFECTS, ASPECT RATIO, LAMINAR FLOW, WIND TUNNELS, ANEMOMETERS, FLOW VISUALIZATION, WAVELETS
Issue or Number:1
Classification Code:PACS: 47.20.Ft; 47.27.Cn
Record Number:CaltechAUTHORS:20130913-104900084
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130913-104900084
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41319
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Sep 2013 21:12
Last Modified:03 Oct 2019 05:47

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