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    Large eddy simulation of turbulent flow over transverse variations in aerodynamic roughness length.

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    Date
    2014-09-05
    Author
    Willingham, David, 1989-
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    Abstract
    A great deal of literature has been published regarding the impact of complex roughness on turbulent flow. However, the topic of transverse variations in surface roughness, has received relatively little attention. In this thesis, large-eddy simulation is used to investigate the effects on turbulent, high Reynolds number flow, caused by periodic step-changes in aerodynamic roughness length, which persist in the streamwise direction. A parametric study is conducted with respect to the ratio of high to low roughness length and the transverse width of high roughness regions. Results show that lateral momentum flux across shear layers, generates secondary flows in the vicinity of transverse transitions in roughness. These secondary flows form boundary layer scale, counter-rotating vortices, which redistribute turbulence and momentum throughout the entire domain and create time-invariant regions of relatively low and high momentum, above low and high surface roughness, respectively.
    URI
    http://hdl.handle.net/2104/9197
    Department
    Mechanical Engineering.
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    Copyright © Baylor® University All rights reserved. Legal Disclosures.
    Baylor University Waco, Texas 76798 1-800-BAYLOR-U
    Baylor University Libraries | One Bear Place #97148 | Waco, TX 76798-7148 | 254.710.2112 | Contact: libraryquestions@baylor.edu
    If you find any errors in content, please contact librarywebmaster@baylor.edu
    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
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    Atmire NV