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Turbulent Channel Flow over Model "Dynamic" Roughness

McKeon, Beverley J. (2010) Turbulent Channel Flow over Model "Dynamic" Roughness. In: IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls. IUTAM Bookseries. No.22. Springer , pp. 87-92. ISBN 978-90-481-9630-2.

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Turbulent flow over a “dynamically rough” wall is modeled by considering time-dependent velocity perturbations in the streamwise and wall-normal directions imposed at the wall, a crude linearization. Analysis of the linearized Navier-Stokes operator is performed to select roughness parameters that are predicted to lead to a large disturbance amplification in the body of the flow. Direct numerical simulations of turbulent channel flow at Re_τ ~ 500 with three different roughness amplitudes, a^+, indicate that for a^+ = 10 the response of the flow approximates this predicted form, including the development of a significant span-wise velocity component. The turbulence characteristics, as a function of amplitude, are hypothesized to offer insight of relevance to the static roughness problem.

Item Type:Book Section
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McKeon, Beverley J.0000-0003-4220-1583
Additional Information:© 2010 Springer Science+Business Media B. V. The author wishes to acknowledge Javier Jiménez for generously permitting the use of the DNS code and for useful conversations and ideas, and the support of a CTR Summer Program fellowship during the summer of 2008.
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CTR Summer Program fellowshipUNSPECIFIED
Series Name:IUTAM Bookseries
Issue or Number:22
Record Number:CaltechAUTHORS:20110713-114512764
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24408
Deposited By: Jason Perez
Deposited On:14 Jul 2011 14:34
Last Modified:05 May 2020 18:40

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