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Characterization and Low-Dimensional Modeling of Urban Fluid Flow
Technical Report,01 May 2011,01 Apr 2014
Illinois Institute of Technology Chicago United States
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This report describes work studying the structure of a model urban boundary layer flow. The flow around this geometry was studied both experimentally as well as computationally. For the experiment, a Stereoscopic Particle Image Velocimetry SPIV method was developed that allows for a three-dimensional description of this urban flow. On the computational side, a new spectral-element code was developed that was demonstrated to produce accurate results, and can scale to thousands of processors on large high-performance computing systems. Wind tunnel experiments were performed at a number of different angles of incidence, providing for the first time a detailed overview of the effect of wind direction on the flow structure. The effects of incidence angles from 0 to 45 degrees of the incoming flow with respect to the urban array were investigated. A strong channeling effect is observed for all incidence angles and is in agreement with that observed in other investigations for as little as 4 degrees. This channeling significantly affects the turbulence distribution within the array, the correlations between the various gust components and the structures responsible for contaminant transport.
APPROVED FOR PUBLIC RELEASE