The dynamics of the transition zone and its modeling

Narasimha, R (1991) The dynamics of the transition zone and its modeling. In: VKI, Boundary Layers in Turbomachines 100 p (SEE N92-24336 15-07) 1991, Belgium.

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It is shown that the key variable in the transition zone is the 'intermittency' gamma, experimentally defined as the fraction of time that the flow is turbulent at any given station. The basic theory is considered. Hypotheses about spot formation are formulated. Anomalous spot propagation and subtransitions are examined. It is shown that prediction of onset is a major unsolved problem in transition dynamics. The rate at which turbulent spots are born determined the intermittency distribution. Models for the transition zone are reviewed. A linear combination model is described in detail. (ESA)

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Boundary layer transition;Boundary layers;Intermittency; Mathematical models;Pressure gradients;Transition flow; Axisymmetric flow;Fluid dynamics;Laminar flow;Linear prediction;Pressure distribution;Turbulent flow
Subjects: AERONAUTICS > Aerodynamics
Depositing User: M/S ICAST NAL
Date Deposited: 12 Oct 2006
Last Modified: 24 May 2010 04:21

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