Published January 1992
| Published
Journal Article
Open
An exploration of the wake three dimensionalities caused by a local discontinuity in cylinder diameter
- Creators
- Lewis, C. G.
-
Gharib, M.
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.
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.Attached Files
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Additional details
- Eprint ID
- 41319
- Resolver ID
- CaltechAUTHORS:20130913-104900084
- N00014-90-J-1314
- Office of Naval Research (ONR) Ocean Engineering Division
- N00014-86-K-0758
- DARPA/URI
- Created
-
2013-09-16Created from EPrint's datestamp field
- Updated
-
2023-03-14Created from EPrint's last_modified field
- Caltech groups
- GALCIT