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Further studies of unsteady boundary layers with flow reversalOne set of calculations was performed using the first order, time dependent turbulent boundary layer equations, and extended earlier work by Nash and Patel to a wider range of flows. Another set of calculations was performed for laminar flow using the time dependent Navier-Stokes equations. The results of the calculations confirm previous conclusions concerning the existence of a regime of unseparated flow, containing an embedded region of reversal, which is accessible to first order boundary layer theory. However, certain doubts are cast on the precise nature of the events which accompany the eventual breakdown of the theory due to singularity onset. The earlier view that the singularity appears as the final event in a sequence involving rapid thickening of the boundary layer and the formation of a localized region of steep gradients is called into question by the present results. It appears that singularity onset is not necessarily preceded by rapid boundary layer thickening, or even necessarily produces immediate thickening.
Document ID
19770007044
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Nash, J. F. (Sybucon, Inc. Atlanta, GA, United States)
Date Acquired
September 3, 2013
Publication Date
December 1, 1976
Publication Information
Publisher: NASA
Subject Category
Aerodynamics
Report/Patent Number
NASA-CR-2767
Accession Number
77N13987
Funding Number(s)
CONTRACT_GRANT: NAS2-8771
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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