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Recent insights into instability and transition to turbulence in open-flow systemsRoads to turbulence in open-flow shear layers are interpreted as sequences of often competing instabilities. These correspond to primary and higher order restructurings of vorticity distributions which culminate in convected spatial disorder (with some spatial coherence on the scale of the shear layer) traditionally called turbulence. Attempts are made to interpret these phenomena in terms of concepts of convective and global instabilities on one hand, and of chaos and strange attractors on the other. The first is fruitful, and together with a review of mechanisms of receptivity provides a unifying approach to understanding and estimating transition to turbulence. In contrast, current evidence indicates that concepts of chaos are unlikely to help in predicting transition in open-flow systems. Furthermore, a distinction should apparently be made between temporal chaos and the convected spatial disorder of turbulence past Reynolds numbers where boundary layers and separated shear layers are formed.
Document ID
19880020695
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Morkovin, Mark V. (Illinois Inst. of Tech. Chicago., United States)
Date Acquired
September 5, 2013
Publication Date
August 1, 1988
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NAS 1.26:181693
NASA-CR-181693
ICASE-88-44
Accession Number
88N30079
Funding Number(s)
CONTRACT_GRANT: NAS1-18605
CONTRACT_GRANT: NAS1-18107
PROJECT: RTOP 505-90-21-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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