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. doi:10.1063/1.858489. https://resolver.caltech.edu/CaltechAUTHORS:20130913-104900084
|
PDF
- Published Version
See Usage Policy. 2MB |
Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20130913-104900084
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: |
| |||||||||
| 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: |
| |||||||||
| 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 | |||||||||
| DOI: | 10.1063/1.858489 | |||||||||
| 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: | 10 Nov 2021 04:28 |
Repository Staff Only: item control page
