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Type of Document Master's Thesis Author Stolpa, Scott Robert Author's Email Address sstolpa@nd.edu URN etd-07092004-135744 Title Spatially Resolved Near Surface Motions in the Atmospheric Boundary Layer Degree Master of Science in Aerospace Engineering Department Aerospace and Mechanical Engineering Advisory Committee
Advisor Name Title Dr. Scott C. Morris Committee Chair Dr. Flint O. Thomas Committee Member Dr. Thomas J. Mueller Committee Member Keywords
- SLTEST
- PIV
- atmospheric boundary layer
Date of Defense 2004-07-01 Availability unrestricted Abstract PIV data were collected from the SLTEST site in Utah. The site was chosen because conditions produce a high Reynolds number boundary layer (Rq = O(106)) over a flat surface. Time averaged results indicate that the data are an accurate representation of a rough wall laboratory boundary layer with zero pressure gradient. Instantaneous realizations of the velocity field show an inclined shear layer in approximately 40% of the images at a mean angle of 19o. The shear layer separates a region of relatively uniform high momentum from a region of relatively uniform low momentum. This shear layer typically exhibits a set of vortex cores identified by circular streamlines in a convected reference frame. Conditionally averaging the velocity field based on high swirl strength yields inclined regions of low momentum and inclined streamlines. These results supplement the work of previous authors who have found these features in low Reynolds number flows.Files
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