Journal
JOURNAL OF FLUID MECHANICS
Volume 673, Issue -, Pages 218-244Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0022112010006336
Keywords
boundary layers; boundary layer structure; turbulent boundary layers
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Three-dimensional (3D) measurements of a turbulent boundary layer have been made using high-speed particle image velocimetry (PIV) coupled with Taylor's hypothesis, with the objective of characterising the very long streamwise structures that have been observed previously. The measurements show the 3D character of both low-and high-speed structures over very long volumes. The statistics of these structures are considered, as is their relationship to the important turbulence quantities. In particular, the length of the structures and their wall-normal extent have been considered and their relationship to the other components of the velocity fluctuations and the instantaneous stress.
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