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The Long Range Persistence of Wakes Behind a Row of Roughness ElementsWe consider a periodic array of relatively small roughness elements whose spanwise separation is of the order of the local boundary-layer thickness and construct a local asymptotic high-Reynolds-number solution that is valid in the vicinity of the roughness. The resulting flow decays on the very short streamwise length scale of the roughness, but the solution eventually becomes invalid at large downstream distances and a new solution has to be constructed in the downstream region. This latter result shows that the roughness-generated wakes can persist over very long streamwise distances, which are much longer than the distance between the roughness elements and the leading edge. Detailed numerical results are given for the far wake structure.
Document ID
20110016094
Acquisition Source
Glenn Research Center
Document Type
Reprint (Version printed in journal)
Authors
Goldstein, M. E.
(NASA Glenn Research Center Cleveland, OH, United States)
Sescu, Adrian
(Toledo Univ. Toledo, OH, United States)
Duck, Peter W.
(Manchester Univ. United Kingdom)
Choudhari, Meelan
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2010
Publication Information
Publication: Journal of Fluid Mechanics
Publisher: Cambridge University Press
Volume: 644
Subject Category
Aerodynamics
Report/Patent Number
E-17987
Funding Number(s)
WBS: WBS 984754.02.07.03.17.03
Distribution Limits
Public
Copyright
Other

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