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On transition due to three-dimensional disturbances in plane Poiseuille flow

Published online by Cambridge University Press:  26 April 2006

Barbro G. B. Klingmann
Barbro G. B. Klingmann
Affiliation:
Department of Gasdynamics, Royal Institute of Technology, S-100 44 Stockholm, Sweden
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Abstract

The purpose of the present study is to characterize the process of laminar–turbulent transition at Reynolds numbers which are subcritical from the two-dimensional linear point of view. The development of a point-like disturbance was studied in an air flow channel with hot-wire anemometry at a Reynolds number of 1600. Localized disturbances were triggered at one of the walls and their development followed downstream by traversing the hot-wire probe in the streamwise direction over a distance of 90 half channel heights, as well as in the normal and spanwise directions. The disturbance evolved into elongated streaky structures with strong spanwise shear (i.e. normal vorticity) which grew in amplitude and streamwise extension and thereafter either decayed or gave rise to a turbulent spot. The results indicate that the mechanism underlying the initial growth is a linear one resulting from the coupling between the normal velocity and the normal vorticity, as described by the three-dimensional linear equations. The nonlinear development of the structure leads to the formation of intense normal shear layers and the appearance of oscillations and ‘spikes’, which multiply and form the rear or a turbulent spot.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 240 , July 1992 , pp. 167 - 195
Copyright
© 1992 Cambridge University Press

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