Authors: Giuseppe A Rosi Michael Sherry Matthias Kinzel David E Rival
Publish Date: 2014/05/13
Volume: 55, Issue: 5, Pages: 1736-
Abstract
As a first step toward characterizing coherent structures within the atmospheric surface layer ASL measurements obtained via a largescale particle tracking velocimetry LSPTV system were validated against windmeasurement station data as well as canonical turbulent boundary layer studies The LSPTV system resolves threedimensional Lagrangian tracks over a 16 m3 volume Meanvelocity measurements as well as vertical and shear Reynoldsstress measurements generally agreed with windmeasurement station data and Reynoldsstress profiles referenced from literature The probability distributions for streamwise spanwise and vertical velocityfluctuation components appear normally distributed about zero Furthermore the probability distributions for all three components of Lagrangian acceleration were exponential and followed the parametrization curve from LaPorta et al Lett Nat 4091017–1019 2001 Lastly the vorticity probability distributions were exponential and symmetric about zero which matches findings from Balint et al Fluid Mech 22853–86 1991 The vorticity intensity measured by the LSPTV system was less than values from Priyadarshana et al Fluid Mech 570307–346 2007 which is attributed to the low spatial resolution However the average spacing of 05 m between tracer particles is deemed sufficient for the future characterization of vortical structures within the ASLThe authors wish to thank Alberta Innovates Technology Futures for their financial backing Thanks also go to Genivar Wind for their generous support in the development and operation of the wind mast The authors also wish to thank Tyler Christensen and Mohamed Arif Mohamed for their assistance during data acquisition and Dr Masaki Hayashi for providing access to his eddycovariance system
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