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Type: Journal article
Title: Three-dimensional structure of a low-Reynolds-number turbulent boundary layer
Author: Delo, C.
Kelso, R.
Smits, A.
Citation: Journal of Fluid Mechanics, 2004; 512:47-83
Publisher: Cambridge Univ Press
Issue Date: 2004
ISSN: 0022-1120
Statement of
Carl J Delo, Richard M Kelson and Alexander J Smits
Abstract: A low-Reynolds-number zero-pressure-gradient incompressible turbulent boundary layer was investigated using a volumetric imaging technique. The Reynolds number based on momentum thickness was 700. The flow was tagged with a passive scalar from two spanwise dye slots to distinguish between fluid motions originating in the inner and outer portions of the boundary layer. The resulting volumetric scalar field was interrogated using a laser sheet scanner developed for this study. Two- and three-dimensional time-dependent visualizations of a 50 volume time series are presented (equivalent to 17δ in length). In the outer portion of the boundary layer, scalar structures were observed to lie along lines in the (x, z)-plane, inclined to the streamwise (x-)direction in the range ±50°. The ejection of brightly dyed fluid packets from the near-wall region was observed to be spatially organized, and related to the passage of the large-scale scalar structures.
Provenance: Published online by Cambridge University Press 23 Jul 2004
Rights: Copyright © 2004 Cambridge University Press
DOI: 10.1017/S0022112004009693
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