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Spatially Resolved Near Surface Motions in the Atmospheric Boundary Layer

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posted on 2004-07-09, 00:00 authored by Scott Robert Stolpa
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.

History

Date Created

2004-07-09

Date Modified

2018-10-29

Research Director(s)

Dr. Scott C. Morris

Committee Members

Dr. Flint O. Thomas Dr. Thomas J. Mueller

Degree

  • Master of Science in Aerospace Engineering

Degree Level

  • Master's Thesis

Language

  • English

Alternate Identifier

etd-07092004-135744

Publisher

University of Notre Dame

Program Name

  • Aerospace and Mechanical Engineering

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