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The three-dimensional evolution of a plane mixing layer: pairing and transition to turbulence

Published online by Cambridge University Press:  26 April 2006

Robert D. Moser  and
Michael M. Rogers
Robert D. Moser
Affiliation:
NASA-Ames Research Center, Moffett Field, CA 94035, USA
Michael M. Rogers
Affiliation:
NASA-Ames Research Center, Moffett Field, CA 94035, USA
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Abstract

The evolution of three-dimensional temporally evolving plane mixing layers through as many as three pairings has been simulated numerically. All simulations were begun from a few low-wavenumber disturbances, usually derived from linear stability theory, in addition to the mean velocity. Three-dimensional perturbations were used with amplitudes ranging from infinitesimal to large enough to trigger a rapid transition to turbulence. Pairing is found to inhibit the growth of infinitesimal three-dimensional disturbances, and to trigger the transition to turbulence in highly three-dimensional flows. The mechanisms responsible for the growth of three-dimensionality and onset of transition to turbulence are described. The transition to turbulence is accompanied by the formation of thin sheets of spanwise vorticity, which undergo secondary rollups. The post-transitional simulated flow fields exhibit many properties characteristic of turbulent flows.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 247 , February 1993 , pp. 275 - 320
Copyright
© 1993 Cambridge University Press

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