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Title: The signature of laminar instabilities in the zone of transition to turbulence
Authors: Vinod, N
Govindarajan, Rama
Keywords: turbulent spots
boundary layer
Free-Stream Turbulence
Issue Date: 1-Jan-2007
Publisher: Taylor & Francis Ltd
Citation: Journal of Turbulence 8(2), 1-19 (2007)
Abstract: We demonstrate that the spacetime statistics of the birth of turbulent spots in boundary layers can be reconstructed qualitatively from the average behaviour of macroscopic measures in the transition zone. The conclusion in [ 1] that there exists a connection between the patterns in laminar instability and the birth of turbulent spots is strengthened. We examine why the relationship between instability and transition to turbulence is manifest in some cases and appears to be totally absent in others. Novel cellular automaton-type simulations of the transition zone are conducted, and the pattern of spot birth is obtained from secondary instability analysis. The validity of the hypothesis of concentrated breakdown, according to which most turbulent spots originate at a particular streamwise location, is assessed. The predictions made lend themselves to straightforward experimental verification.
Description: Restricted Access
Other Identifiers: 1468-5248
Appears in Collections:Research Articles (Rama Govindarajan)

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