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Title:Vortex organization in outer region of turbulent boundary layer
Author(s):Adrian, Ronald J.; Meinhart, Carl D.; Tomkins, Christopher D.
Turbulent Boundary Layer
Abstract:The structure of energy containing turbulence in the outer region of a zero-pressure gradient boundary layer has been studied using particle image velocimetry (PIV) to measure the instantaneous velocity fields in a streamwise-wall-normal plane. Experiments performed at three Reynolds numbers between 930 < Reθ < 6845 show that the boundary layer is densely populated by velocity fields associated with hairpin or cane vortices. The signature pattern of the hairpin consists of a spanwise vortex core located above a region of strong second quadrant fluctuations (u < 0 and v > 0) that occur on a locus inclined at 30-60° to the wall.
Issue Date:1999-11
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 924
Genre:Technical Report
Sponsor:National Science Foundation; Office of Naval Researchearch
Rights Information:Copyright 1999 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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