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A nonlinear structural concept for drag-reducing compliant wallsTwo mechanisms of drag reduction for flow over flat plates were investigated. The first mechanism employs Bushnell's hypothesis that compliant walls produce drag reduction by interfering with the formation of the turbulent spots in a turbulent boundary layer. It is shown that the amplitudes and frequencies of compliant wall motions for drag reduction might be achieved by using slightly curved walls and the resulting large amplitude motions of snap buckling. A simple structural model of an arch is used in the analysis, and an asymptotic method is developed. The required wall motions can be obtained by using materials like mylar. In addition, the delay of transition from laminar to turbulent flow by driven walls was studied for Poiseuille channel flow. The walls are driven by a periodic traveling wave. A significant increase in the transitional Reynolds number is obtained by appropriately prescribing the wavelength and phase velocity of the wall motion. Previously developed asymptotic methods are used in the analysis. Previously announced in STAR as N83-11061
Document ID
19840040578
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Reiss, E. L.
(Northwestern University Evanston, IL, United States)
Date Acquired
August 12, 2013
Publication Date
March 1, 1984
Publication Information
Publication: AIAA Journal
Volume: 22
ISSN: 0001-1452
Subject Category
Aerodynamics
Accession Number
84A23365
Funding Number(s)
CONTRACT_GRANT: NAS1-14717
Distribution Limits
Public
Copyright
Other

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