Transitional boundary layer spot in a fully turbulent environment.

M. Zilberman, I. Wygnanski, R. E. Kaplan

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Abstract

A spark was used to initiate and mark in time a turbulent spot in an initially laminar boundary layer. This marked spot of turbulence merged and interacted with the natural turbulent boundary layer generated by a row of spherical trips. By using a digital technique to align individual spot signatures, thus correcting for variations in the transit time to a given measurement station, a structure was tracked over a streamwise extent of 70 average turbulent boundary-layer thicknesses. The scale of the structure is of the order of 10SUPg in the streamwise direction becoming 2-3SUPg in the interface region of the boundary layer and is less than 4SUPg in the spanwise direction, in spite of fact that no spanwise alignment was performed. The structure is characterized by a convection speed of 0.9USUP. It exhibits features in detailed agreement with those at the other region of the turbulent boundary layer (interface region) and is consistant with existing two-and three-point space-time correlations. (A)

Original languageEnglish (US)
Pages (from-to)eds., New York, U.S.A., Am. Inst. of Physics, 1976)
JournalPHYS. FLUIDS
Volume20
Issue number10 , Part II, Oct. 1977
DOIs
StatePublished - Jan 1 1976
Externally publishedYes

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ASJC Scopus subject areas

  • Engineering(all)

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Zilberman, M., Wygnanski, I., & Kaplan, R. E. (1976). Transitional boundary layer spot in a fully turbulent environment. PHYS. FLUIDS, 20(10 , Part II, Oct. 1977), eds., New York, U.S.A., Am. Inst. of Physics, 1976). https://doi.org/10.1063/1.861739