Horsehoe vortices in uniformly sheared turbulence
Horsehoe vortices in uniformly sheared turbulence
Uniformly sheared flow (USF) with a turbulence Reynolds number Re! of approximately 150 and a shear rate parameter of approximately 12 has been generated in a water tunnel and its instantaneous structure has been examined using flow visualization, laser Doppler velocimetry and particle image velocimetry. Horseshoe-shaped vortices, similar to those observed in turbulent boundary layers (TBL), were found to be prevalent in this flow. These vortices were observed within relatively strong shear layers, which separated regions of fluid with nearly uniform velocity. Like TBL, USF was found to contain structures whose heads pointed towards the high speeds, but, in contrast to TBL, USF also contained inverted structures. These results demonstrate that organized horseshoe/hairpin-type vortices are generated by mean shear irrespectively of the presence of solid walls.
Vanderwel, Christina
fbc030f0-1822-4c3f-8e90-87f3cd8372bb
Tavoularis, Stavros
9800ff44-e983-4293-a2b1-f29eec90d359
July 2011
Vanderwel, Christina
fbc030f0-1822-4c3f-8e90-87f3cd8372bb
Tavoularis, Stavros
9800ff44-e983-4293-a2b1-f29eec90d359
Vanderwel, Christina and Tavoularis, Stavros
(2011)
Horsehoe vortices in uniformly sheared turbulence.
7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011, , Ottawa, Canada.
28 - 31 Jul 2011.
6 pp
.
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Conference or Workshop Item
(Paper)
Abstract
Uniformly sheared flow (USF) with a turbulence Reynolds number Re! of approximately 150 and a shear rate parameter of approximately 12 has been generated in a water tunnel and its instantaneous structure has been examined using flow visualization, laser Doppler velocimetry and particle image velocimetry. Horseshoe-shaped vortices, similar to those observed in turbulent boundary layers (TBL), were found to be prevalent in this flow. These vortices were observed within relatively strong shear layers, which separated regions of fluid with nearly uniform velocity. Like TBL, USF was found to contain structures whose heads pointed towards the high speeds, but, in contrast to TBL, USF also contained inverted structures. These results demonstrate that organized horseshoe/hairpin-type vortices are generated by mean shear irrespectively of the presence of solid walls.
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Published date: July 2011
Venue - Dates:
7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011, , Ottawa, Canada, 2011-07-28 - 2011-07-31
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Local EPrints ID: 491832
URI: http://eprints.soton.ac.uk/id/eprint/491832
PURE UUID: 9bc71203-f3bf-41aa-b3c9-f2ec50f89b58
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Date deposited: 04 Jul 2024 16:56
Last modified: 11 Jul 2024 01:53
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Author:
Stavros Tavoularis
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