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Near-surface particle image velocimetry measurements in a transitionally rough-wall atmospheric boundary layer

Published online by Cambridge University Press:  21 May 2007

SCOTT C. MORRIS ,
SCOTT R. STOLPA ,
PAUL E. SLABOCH  and
JOSEPH C. KLEWICKI
SCOTT C. MORRIS
Affiliation:
Aerospace and Mechanical Engineering, University Of Notre Dame, Notre Dame, IN 46556, [email protected]
SCOTT R. STOLPA
Affiliation:
Aerospace and Mechanical Engineering, University Of Notre Dame, Notre Dame, IN 46556, [email protected]
PAUL E. SLABOCH
Affiliation:
Aerospace and Mechanical Engineering, University Of Notre Dame, Notre Dame, IN 46556, [email protected]
JOSEPH C. KLEWICKI
Affiliation:
Mechanical Engineering, University of New Hampshire, Durham, NH 03824, USA
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Abstract

The Reynolds number dependence of the structure and statistics of wall-layer turbulence remains an open topic of research. This issue is considered in the present work using two-component planar particle image velocimetry (PIV) measurements acquired at the Surface Layer Turbulence and Environmental Science Test (SLTEST) facility in western Utah. The Reynolds number (δuτ/ν) was of the order 106. The surface was flat with an equivalent sand grain roughness k+ = 18. The domain of the measurements was 500 < yuτ/ν < 3000 in viscous units, 0.00081 < y/δ < 0.005 in outer units, with a streamwise extent of 6000ν/uτ. The mean velocity was fitted by a logarithmic equation with a von Kármán constant of 0.41. The profile of u′v′ indicated that the entire measurement domain was within a region of essentially constant stress, from which the wall shear velocity was estimated. The stochastic measurements discussed include mean and RMS profiles as well as two-point velocity correlations. Examination of the instantaneous vector maps indicated that approximately 60% of the realizations could be characterized as having a nearly uniform velocity. The remaining 40% of the images indicated two regions of nearly uniform momentum separated by a thin region of high shear. This shear layer was typically found to be inclined to the mean flow, with an average positive angle of 14.9°.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 580 , 10 June 2007 , pp. 319 - 338
Copyright
Copyright © Cambridge University Press 2007

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