Unsteadiness in flow over a flat plate at angle-of-attack at low reynolds numbers

Kunihiko Taira, William B. Dickson, Tim Colonius, Michael H. Dickinson, Clarence Worth Rowley

Research output: Chapter in Book/Report/Conference proceedingConference contribution

17 Scopus citations

Abstract

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.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
Pages8791-8806
Number of pages16
ISBN (Print)1563478900, 9781563478901
DOIs
StatePublished - 2007
Event45th AIAA Aerospace Sciences Meeting 2007 - Reno, NV, United States
Duration: Jan 8 2007Jan 11 2007

Publication series

NameCollection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
Volume13

Other

Other45th AIAA Aerospace Sciences Meeting 2007
CountryUnited States
CityReno, NV
Period1/8/071/11/07

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

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    Taira, K., Dickson, W. B., Colonius, T., Dickinson, M. H., & Rowley, C. W. (2007). Unsteadiness in flow over a flat plate at angle-of-attack at low reynolds numbers. In Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting (pp. 8791-8806). (Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting; Vol. 13). American Institute of Aeronautics and Astronautics Inc.. https://doi.org/10.2514/6.2007-710