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Effect of compliant wall motion on turbulent boundary layersA critical analysis of available compliant wall data which indicated drag reduction under turbulent boundary layers is presented. Detailed structural dynamic calculations suggest that the surfaces responded in a resonant, rather than a compliant, manner. Alternate explanations are given for drag reductions observed in two classes of experiments: (1) flexible pipe flows and (2) water-backed membranes in air. Analysis indicates that the wall motion for the remaining data is typified by short wavelengths in agreement with the requirements of a possible compliant wall drag reduction mechanism recently suggested by Langley.
Document ID
19780027971
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bushnell, D. M.
(NASA Langley Research Center Hampton, VA, United States)
Hefner, J. N.
(NASA Langley Research Center Hampton, Va., United States)
Ash, R. L.
(Old Dominion University Norfolk, Va., United States)
Date Acquired
August 9, 2013
Publication Date
October 1, 1977
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
78A11880
Distribution Limits
Public
Copyright
Other

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