Free-stream turbulence effects on a separation bubble

Masaru Kiya, Kyuro Sasaki

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)


Effects of free-stream turbulence on a separation bubble formed along a side of a blunt plate with right-angled corners are studied. The free-stream turbulence was generated by a thin circular rod which was placed at a certain distance upstream of the plate along its stagnation streamline. Various characteristic parameters of the separation bubble such as the bubble length, the integral length scale of large-scale vortices, the maximum pressure difference in the bubble, a few characteristics lengths of the time-mean pressure profile etc. are fairly well correlated with the turbulence intensity just outside the separated shear layer near the edge. The turbulence length scale there was a fairly unique function of the turbulence intensity. Statistical properties of the fluctuating surface pressure are also studied and used to demonstrate the large-scale vortices in the reattaching zone. The maximum r.m.s. surface pressure was found to be estimated in terms of the longitudinal gradient of the time-mean pressure and the length scale of vortices in the reattaching zone.

Original languageEnglish
Pages (from-to)375-386
Number of pages12
JournalJournal of Wind Engineering and Industrial Aerodynamics
Issue number1-3
Publication statusPublished - Dec 1983
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


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