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Flow control with rotating cylinders

Published online by Cambridge University Press:  21 July 2017

James C. Schulmeister Open the ORCID record for James C. Schulmeister [Opens in a new window] ,
J. M. Dahl ,
G. D. Weymouth  and
M. S. Triantafyllou Open the ORCID record for M. S. Triantafyllou [Opens in a new window]
James C. Schulmeister*
Affiliation:
Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, USA
J. M. Dahl
Affiliation:
Department of Ocean Engineering, University of Rhode Island, 215 South Ferry Road, Narragansett, RI 02882, USA
G. D. Weymouth
Affiliation:
Southampton Marine and Maritime Institute, University of Southampton, Southampton SO17 1BJ, UK
M. S. Triantafyllou
Affiliation:
Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, USA
*
†Email address for correspondence: [email protected]
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Abstract

We study the use of small counter-rotating cylinders to control the streaming flow past a larger main cylinder for drag reduction. In a water tunnel experiment at a Reynolds number of 47 000 with a three-dimensional and turbulent wake, particle image velocimetry (PIV) measurements show that rotating cylinders narrow the mean wake and shorten the recirculation length. The drag of the main cylinder was measured to reduce by up to 45 %. To examine the physical mechanism of the flow control in detail, a series of two-dimensional numerical simulations at a Reynolds number equal to 500 were conducted. These simulations investigated a range of control cylinder diameters in addition to rotation rates and gaps to the main cylinder. Effectively controlled simulated flows present a streamline that separates from the main cylinder, passes around the control cylinder, and reattaches to the main cylinder at a higher pressure. The computed pressure recovery from the separation to reattachment points collapses with respect to a new scaling, which indicates that the control mechanism is viscous.

JFM classification

Flow Control: Drag reduction Flow Control: Flow Control
Type
Papers
Information
Journal of Fluid Mechanics , Volume 825 , 25 August 2017 , pp. 743 - 763
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Copyright
© 2017 Cambridge University Press 

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