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On the Environmental Realizability of Algebraically Growing Disturbances and Their Relation to Klebanoff ModesA theoretical explanation of some experimentally observed phenomena associated with the so-called Klebanoff modes is obtained by analyzing the flow over a finite thickness flat plate resulting from a small-amplitude distortion imposed on the upstream mean flow. The analysis shows (among other things) how the stretching of the vortex lines around the plate leads to streamwise vorticity at the plate surface, which then produces a streamwise velocity perturbation within the boundary layer that can be related to the experimentally observed Klebanoff mode. The complete evolution of this flow must be found by solving the boundary-region equations of Kemp (1951) and Davis and Rubin (1980), but a limiting analytical solution can also be obtained. Since the initial growth of the boundary-layer disturbance is nearly algebraic, our results demonstrate how the algebraically growing disturbances promoted by Landahl and others can be generated by a realistic external-disturbance environment. The relationship between these results and various bypass transition mechanisms is discussed.
Document ID
19980017493
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Goldstein, Marvin E. (NASA Lewis Research Center Cleveland, OH United States)
Wundrow, David W. (NYMA, Inc. Brook Park, OH United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1998
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA/TM-1998-206298
E-10995
NAS 1.15:206298
Meeting Information
Meeting: Theoretical and Computational Fluid Dynamics
Location: Tallahassee, FL
Country: United States
Start Date: November 6, 1996
End Date: November 8, 1996
Sponsors: Florida State Univ.
Funding Number(s)
PROJECT: RTOP 537-05-21
CONTRACT_GRANT: NAS3-27186
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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