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Effect of sting size on the wake of a sphere at subcritical Reynolds numbers

Norman, A. K. and McKeon, B. J. (2008) Effect of sting size on the wake of a sphere at subcritical Reynolds numbers. In: 38th Fluid Dynamics Conference and Exhibit, June 23-26, 2008, Seattle, WA.

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Vortex shedding and turbulent motion in the wake of a sphere that is supported using a streamwise-aligned cylindrical sting are investigated at a subcritical Reynolds number of Re=3800, using high speed particle image velocimetry. The mechanism by which the presence of a sting of increasing diameter relative to the diameter of the sphere influences the wake, in terms of both the small-scale shear instability and the larger wake instability, is explored and brie y compared with the two-dimensional analog of the splitter plate introduced into a cylinder wake. The difficulties associated with obtaining converged statistics, along with the effect of free stream turbulence and sphere vibrations are detailed. An understanding of the mechanism by which the blockage, or interference, arising from the presence of the sting influences cross-wake communication and downstream development is a necessary precursor to studies of active control of the wake using surface actuation on a sting-mounted sphere.

Item Type:Conference or Workshop Item (Paper)
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McKeon, B. J.0000-0003-4220-1583
Additional Information:© 2008 AIAA. Support from the National Science Foundation under Grant No. 0747672 (Program Manager William W. Schultz) is gratefully acknowledged.
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AIAA Paper2008-4183
Record Number:CaltechAUTHORS:20150303-113517097
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55472
Deposited By: Jamie Sei
Deposited On:03 Mar 2015 22:33
Last Modified:10 Nov 2021 20:46

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