Transitional boundary layer spot in a fully turbulent environment

M. Zilberman, Israel J Wygnanski, R. E. Kaplan

Research output: Contribution to journalArticle

51 Citations (Scopus)

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 10δ in the streamwise direction becoming 2-3δ in the interface region of the boundary layer and is less than 4δ in the spanwise direction, in spite of the fact that no spanwise alignment was performed. The structure is characterized by a convection speed of 0.9 U . It exhibits features in detailed agreement with those at the outer region of the turbulent boundary layer (interface region) and is consistent with existing two- and three-point space-time cortelations.

Original languageEnglish (US)
JournalPhysics of Fluids
Volume20
Issue number10
StatePublished - 1977
Externally publishedYes

Fingerprint

turbulent boundary layer
boundary layers
Boundary layers
digital techniques
laminar boundary layer
boundary layer thickness
transit time
sparks
Laminar boundary layer
convection
stations
turbulence
Electric sparks
alignment
signatures
Turbulence
Direction compound

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Mechanics of Materials
  • Computational Mechanics
  • Fluid Flow and Transfer Processes

Cite this

Transitional boundary layer spot in a fully turbulent environment. / Zilberman, M.; Wygnanski, Israel J; Kaplan, R. E.

In: Physics of Fluids, Vol. 20, No. 10, 1977.

Research output: Contribution to journalArticle

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