NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
On the role of secondary instabilities in laminar-turbulent transition of 2D and 3D boundary layersThe accurate prediction of laminar/turbulent transition is one of the fundamental problems in engineering fluid mechanics. There is almost unanimous consent that such a transition criterion should come from stability theory. Linear primary stability theory describes the initial stage of transition, but falls short of predicting transition. Only in conjunction with empirical correlations, the widely used e(sup n) method is obtained, which, however, lacks a solid physical base. Three-dimensional secondary instabilities are known to play an important role in the transition process. However, no use has been made so far of secondary instabilities, instability interactions or wave resonances to define a 'transition location'. The paper summarizes new attempts to identify certain interaction and resonance phenomena within the laminar-turbulent transition regime in two and three-dimensional boundary layers which are associated with rapid structural and temporal changes of fluctuations beyond their exponential growths.
Document ID
19930018241
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Dallman, Uwe
(Institut fuer Theoretische Stroemungsmechanik Goettingen, Germany)
Fischer, Thomas M.
(Institut fuer Theoretische Stroemungsmechanik Goettingen, Germany)
Koch, Werner
(Institut fuer Theoretische Stroemungsmechanik Goettingen, Germany)
Bippes, Hans
(Deutsche Forschungs- und Versuchsanstalt fuer Luft- und Raumfahrt Goettingen, Germany)
Date Acquired
September 6, 2013
Publication Date
January 1, 1992
Publication Information
Publication: California State Univ., The Fifth Symposium on Numerical and Physical Aspects of Aerodynamic Flows
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
93N27430
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available