An experimental study of flow around a circular cylinder with and without end plates in ground effect
Nishino, Takafumi, Roberts, Graham T. and Zhang, Xin (2006) An experimental study of flow around a circular cylinder with and without end plates in ground effect. In, 36th AIAA Fluid Dynamics Conference, San Francisco, USA, 05 - 08 Jun 2006. USA, American Institute of Aeronautics and Astronautics.
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Description/Abstract
Flow and force characteristics have been experimentally studied for a circular cylinder,
with and without end plates, placed near and parallel to a moving ground, over which no
boundary layer developed to interfere with the cylinder. Mean drag and lift measurements,
surface oil-flow visualisation, and particle image velocimetry (PIV) measurements were
carried out at two upper-subcritical Reynolds numbers of 0.4 and 1.0×105 (based on the
cylinder diameter d) to investigate the effects of the gap ratio h/d, where h is the gap between
the cylinder and the ground. For the cylinder with end plates, the drag rapidly decreased as
h/d decreased to less than 0.5, but became constant for h/d of less than 0.35. This distinctive
drag behaviour was explained by a global change in the near wake: the Kármán-type vortex
shedding was found to be intermittent at h/d = 0.4, and then totally ceased (and instead two
nearly parallel shear layers were formed) at h/d = 0.3 and below. Meanwhile, for the cylinder
without end plates, no such a critical change in drag was observed as the Kármán-type
vortices were not generated in the near wake region for all h/d investigated.
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Additional Information: | AIAA paper 2006-3551 |
| Related URLs: | |
| Keywords: | circular cylinder, ground effect |
| Subjects: | T Technology > TL Motor vehicles. Aeronautics. Astronautics Q Science > QC Physics |
| Divisions: | University Structure - Pre August 2011 > School of Engineering Sciences > Aerodynamics & Flight Mechanics |
| Item ID: | 49001 |
| Date Deposited: | 19 Oct 2007 |
| Last Modified: | 02 Mar 2012 13:09 |
| Contributors: | Nishino, Takafumi (Author) Roberts, Graham T. (Author) Zhang, Xin (Author) |
| Date: | June 2006 |
| Additional Information: | AIAA paper 2006-3551 |
| Status: | Published |
| Publisher: | American Institute of Aeronautics and Astronautics |
| URI: | http://eprints.soton.ac.uk/id/eprint/49001 |
Available Versions of this Item
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An experimental study of flow around a circular cylinder with and without end plates in ground effect. (deposited 06 Feb 2008)
- An experimental study of flow around a circular cylinder with and without end plates in ground effect. (deposited 19 Oct 2007) [Currently Displayed]
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