Three-dimensional vortex structure in a leading-edge separation bubble at moderate Reynolds numbers

Kyuro Sasaki, Masaru Kiya

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


This paper describes the results of a flow visualization study which concerns three-dimensional vortex structures in a leading-edge separation bubble formed along the sides of a blunt flat plate. Dye and hydrogen bubbles were used as tracers. Reynolds number (Re), based on the plate thickness, was varied from 80 to 800. For 80 < Re < 320, the separated shear layer remains laminar up to the reattachment line without significant spanwise distortion of vortex filaments. For 320 < Re < 380, a Λ-shaped deformation of vortex filaments appears shortly downstream of the reattachment and is arranged in-phase in the downstream direction. For Re > 380, hairpin-like structures are formed and arranged in a staggered manner. The longitudinal and spanwise distances of the vortex arrangement are presented as functions of the Reynolds number.

Original languageEnglish
Pages (from-to)405-410
Number of pages6
JournalJournal of Fluids Engineering, Transactions of the ASME
Issue number3
Publication statusPublished - Sept 1991

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes
  • Building and Construction
  • Mechanical Engineering


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