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Effect of roughness on the stability of boundary layersAn analysis is conducted on the effect of imperfections consisting of humps and dips on the stability of incompressible flows over flat plates. The mean flow is calculated using interacting boundary layers. Linear quasiparallel spatial stability is used to calculate the growth rates and mode shapes of two-dimensional disturbances. Then, the amplification factor is computed. A search for the most dangerous frequency is conducted based on an amplification factor of 9 in the shortest distance. Correlations are made with the transition experiment of Walker and Greening using the e sup 9 method.
Document ID
19900003202
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Nayfeh, Ali H. (Virginia Univ. Charlottesville, VA, United States)
Ragab, Saad A. (Virginia Univ. Charlottesville, VA, United States)
Al-Maaitah, Ayman (Virginia Univ. Charlottesville, VA, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1987
Publication Information
Publication: NASA, Langley Research Center, Research in Natural Laminar Flow and Laminar-Flow Control, Part 1
Subject Category
Aerodynamics
Accession Number
90N12518
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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