Multiple line Molecular Tagging Velocimetry (MTV) measurements are used to explore the flow fields associated with wall region negative ∂u˜/∂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 ∂u˜+/∂y+ exceeding a negative threshold of −0.25 reveal the highly significant presence of negative ∂u˜/∂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 ±∂u˜/∂y. The importance of these motions to wall region turbulence production is discussed.
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December 1998
Research Papers
Spatial Structure of Negative ∂u˜/∂y in a Low Rθ Turbulent Boundary Layer
Joseph C. Klewicki,
Joseph C. Klewicki
Physical Fluid Dynamics Laboratory, Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112
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Rodney B. Hill
Rodney B. Hill
Physical Fluid Dynamics Laboratory, Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112
Search for other works by this author on:
Joseph C. Klewicki
Physical Fluid Dynamics Laboratory, Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112
Rodney B. Hill
Physical Fluid Dynamics Laboratory, Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112
J. Fluids Eng. Dec 1998, 120(4): 772-777 (6 pages)
Published Online: December 1, 1998
Article history
Received:
September 24, 1997
Revised:
August 26, 1998
Online:
December 4, 2007
Citation
Klewicki, J. C., and Hill, R. B. (December 1, 1998). "Spatial Structure of Negative ∂u˜/∂y in a Low Rθ Turbulent Boundary Layer." ASME. J. Fluids Eng. December 1998; 120(4): 772–777. https://doi.org/10.1115/1.2820737
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