Spatial Structure of Negative ∂ũ/∂y in a Low Rθ Turbulent Boundary Layer

[+] Author and Article Information
Joseph C. Klewicki, Rodney B. Hill

Physical Fluid Dynamics Laboratory, Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112

J. Fluids Eng 120(4), 772-777 (Dec 01, 1998) (6 pages) doi:10.1115/1.2820737 History: Received September 24, 1997; Revised August 26, 1998; Online December 04, 2007


Multiple line Molecular Tagging Velocimetry (MTV) measurements are used to explore the flow fields associated with wall region negative ∂ũ/∂y in a low Rθ turbulent boundary layer. Velocity and velocity gradient statistical profiles establish the present flow as a canonical flat plate boundary layer. Spatial correlations of ∂u/∂y in the (x, y) plane, and the probability of observing negative ∂ũ+ /∂y+ exceeding a negative threshold of −0.25 reveal the highly significant presence of negative ∂ũ/∂y in the region 25 ≤ y+ ≤ 35. Examination of the instantaneous flow fields underlying the conditional pdf indicates that there are two primary contributing motions: (i) streamwise shear layers and (ii) compact regions containing ±∂ũ/∂y. The importance of these motions to wall region turbulence production is discussed.

Copyright © 1998 by The American Society of Mechanical Engineers
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