Manipulating the flow over spherical protuberances in a turbulent boundary layer

René Woszidlo, Lutz Taubert, Israel Wygnanski

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Means of controlling the flow over a large spherical protuberance were examined. The role of suction around the base of the protuberance in reducing or even eliminating the necklace vortex created by the protuberance was considered. In the absence of suction, this vortex was lifted by the low base pressure existing behind the protuberance into the wake, thus affecting the turbulence level along its path. Large vortex generators placed upstream of the protuberance were able to delay local separation of the flow over the protuberance, thus affecting the symmetry of the wake and the level of turbulence on one side or the other. Observations made using flow visualization were supplemented by hot-wire measurements. The experiments were carried out at low speed at Reynolds numbers that did not exceed 3 × 10 5.

Original languageEnglish (US)
Pages (from-to)437-450
Number of pages14
JournalAIAA journal
Issue number2
StatePublished - Feb 2009

ASJC Scopus subject areas

  • Aerospace Engineering


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