University of Illinois Urbana-Champaign

Vortex organization in outer region of turbulent boundary layer

Adrian, Ronald J.; Meinhart, Carl D.; Tomkins, Christopher D.

Permalink

https://hdl.handle.net/2142/112633

Description

Title
Vortex organization in outer region of turbulent boundary layer
Author(s)
  • Adrian, Ronald J.
  • Meinhart, Carl D.
  • Tomkins, Christopher D.
Issue Date
1999-11
Keyword(s)
  • Vortexes
  • 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.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 924
  • 1999-6026
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112633
Sponsor(s)/Grant Number(s)
National Science Foundation; Office of Naval Researchearch
Copyright and License Information
Copyright 1999 Board of Trustees of the University of Illinois

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Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
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.