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Flow control with rotating cylinders

Flow control with rotating cylinders
Flow control with rotating cylinders
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.
0022-1120
743-763
Schulmeister, J.C.
159ff6f5-52b6-464c-85b1-f3cc049720da
Dahl, J.M.
e1051c04-b4f4-497e-9de7-63f820072ec9
Weymouth, G.D.
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Triantafyllou, M.S.
52a0600e-7ca6-46dd-942a-30436220d555
Schulmeister, J.C.
159ff6f5-52b6-464c-85b1-f3cc049720da
Dahl, J.M.
e1051c04-b4f4-497e-9de7-63f820072ec9
Weymouth, G.D.
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Triantafyllou, M.S.
52a0600e-7ca6-46dd-942a-30436220d555

Schulmeister, J.C., Dahl, J.M., Weymouth, G.D. and Triantafyllou, M.S. (2017) Flow control with rotating cylinders. Journal of Fluid Mechanics, 825, 743-763. (doi:10.1017/jfm.2017.395).

Record type: Article

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.

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Schulmeister_jfm_2017 - Accepted Manuscript
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Accepted/In Press date: 1 June 2017
e-pub ahead of print date: 21 July 2017
Published date: 25 August 2017
Organisations: Fluid Structure Interactions Group, Southampton Marine & Maritime Institute

Identifiers

Local EPrints ID: 411422
URI: http://eprints.soton.ac.uk/id/eprint/411422
ISSN: 0022-1120
PURE UUID: 816aa483-2b0b-469d-ae4e-f3cc80f794ce
ORCID for G.D. Weymouth: ORCID iD orcid.org/0000-0001-5080-5016

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Date deposited: 20 Jun 2017 16:31
Last modified: 07 Oct 2020 05:30

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Contributors

Author: J.C. Schulmeister
Author: J.M. Dahl
Author: G.D. Weymouth ORCID iD
Author: M.S. Triantafyllou

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