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An experimental study of the parallel and oblique vortex shedding from circular cylinders

Hammache, M. and Gharib, M. (1991) An experimental study of the parallel and oblique vortex shedding from circular cylinders. Journal of Fluid Mechanics, 232 . pp. 567-590. ISSN 0022-1120. https://resolver.caltech.edu/CaltechAUTHORS:20130918-144219241

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Abstract

An experimental study of the origin of oblique vortex shedding in the laminar wake of circular cylinders was conducted in the range of Reynolds numbers from 40 to 160. Two transverse circular cylinders were positioned upstream of the main shedding cylinder to control the angle of shedding from the main cylinder. The respective distances between each transverse cylinder and the main cylinder were used to induce oblique shedding of different angles, curved shedding, as well as parallel shedding. Measurements of the mean static pressure distribution in the base region of the cylinder and of the mean spanwise component of the velocity in the wake were taken. These measurements revealed that a non-symmetric pressure distribution, which induced a spanwise flow in the base region of the cylinder, was responsible for the oblique shedding. By using a simple model based on the ratio of the streamwise to the spanwise vorticity components, the angle of shedding was predicted within 2" of the value measured from flow visualization. The vorticity was simply evaluated from the spanwise and streamwise velocity profiles of oblique vortex streets obtained with the LDV measurement technique. Parallel vortex shedding showed a symmetric pressure distribution with zero spanwise component of the velocity and zero cross-shear in the cylinder base. It was shown that parallel vortex shedding results in a continuous Strouhal-Reynolds number curve.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1017/S0022112091003804 DOIArticle
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=378263PublisherArticle
Additional Information:© 1991 Cambridge University Press. Received 7 February 1991 and in revised form 3 May 1991. The authors are grateful for the support provided by the Office of Naval Research, Program Contract No. N00014-90J-1314, and by DARPA/URI, Program Contract NO. N00014-86K-0758.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-90J-1314
DARPA/URIN00014-86K-0758
Record Number:CaltechAUTHORS:20130918-144219241
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130918-144219241
Official Citation:M. Hammache and M. Gharib (1991). An experimental study of the parallel and oblique vortex shedding from circular cylinders. Journal of Fluid Mechanics, 232, pp 567-590 doi:10.1017/S0022112091003804
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41397
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Sep 2013 22:11
Last Modified:03 Oct 2019 05:48

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