On the evolution of the wake structure produced by a low-aspect-ratio pitching panel

James H.J. Buchholz, Alexander J. Smits

Research output: Contribution to journalArticle

120 Scopus citations

Abstract

Flow visualization is used to interrogate the wake structure produced by a rigid flat panel of aspect ratio (span/chord) 0.54 pitching in a free stream at a Strouhal number of 0.23. At such a low aspect ratio, the streamwise vorticity generated by the plate tends to dominate the formation of the wake. Nevertheless, the wake has the appearance of a three-dimensional Kármán vortex street, as observed in a wide range of other experiments, and consists of horseshoe vortices of alternating sign shed twice per flapping cycle. The legs of each horseshoe interact with the two subsequent horseshoes in an opposite-sign, then like-sign interaction in which they become entrained. A detailed vortex skeleton model is proposed for the wake formation.

Original languageEnglish (US)
Pages (from-to)433-443
Number of pages11
JournalJournal of Fluid Mechanics
Volume546
DOIs
StatePublished - Jan 10 2006

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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