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Unsteadiness in Flow over a Flat Plate at Angle-of-Attack at Low Reynolds Numbers

Taira, Kunihiko and Dickson, William B. and Colonius, Tim and Dickinson, Michael H. and Rowley, Clarence W. (2007) Unsteadiness in Flow over a Flat Plate at Angle-of-Attack at Low Reynolds Numbers. In: 45th AIAA Aerospace Sciences Meeting and Exhibit, 8-11 January 2007, Reno, NV.

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Flow over an impulsively started low-aspect-ratio flat plate at angle-of-attack is investigated for a Reynolds number of 300. Numerical simulations, validated by a companion experiment, are performed to study the influence of aspect ratio, angle of attack, and planform geometry on the interaction of the leading-edge and tip vortices and resulting lift and drag coefficients. Aspect ratio is found to significantly influence the wake pattern and the force experienced by the plate. For large aspect ratio plates, leading-edge vortices evolved into hairpin vortices that eventually detached from the plate, interacting with the tip vortices in a complex manner. Separation of the leading-edge vortex is delayed to some extent by having convective transport of the spanwise vorticity as observed in flow over elliptic, semicircular, and delta-shaped planforms. The time at which lift achieves its maximum is observed to be fairly constant over different aspect ratios, angles of attack, and planform geometries during the initial transient. Preliminary results are also presented for flow over plates with steady actuation near the leading edge.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription Paper Paper
Taira, Kunihiko0000-0002-3762-8075
Colonius, Tim0000-0003-0326-3909
Dickinson, Michael H.0000-0002-8587-9936
Rowley, Clarence W.0000-0002-9099-5739
Additional Information:© 2007 by the authors. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Published Online: 18 Jun 2012. Work supported by a Multidisciplinary Research Initiative from the United States Air Force Office of Scientific Research (FA9550-05-1-0369, Program Manager: Dr. Fariba Fahroo).
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-05-1-0369
Subject Keywords:Aerospace Systems, Operations and Life Cycle
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Other Numbering System NameOther Numbering System ID
AIAA Paper2007-710
Record Number:CaltechAUTHORS:20190718-165127033
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97268
Deposited By: Melissa Ray
Deposited On:24 Jul 2019 19:46
Last Modified:16 Nov 2021 17:30

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