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Spanwise scale selection in plane mixing layers

Published online by Cambridge University Press:  26 April 2006

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

Direct numerical simulations of temporally evolving plane mixing layers undergoing as many as three pairings have been examined for evidence of spanwise scale change. All simulations were begun from a few low-wavenumber disturbances, usually derived from linear stability theory, in addition to the mean velocity. The amplitude of the initial three-dimensional disturbances varied from infinitesimal to large enough to trigger a rapid transition to turbulence. The time required for a change of characteristic spanwise scale with infinitesimal three-dimensional disturbances was found to be very long, requiring three or more pairings to complete a doubling of the spanwise scale. Stronger three-dimensionality can produce more rapid scale changes, but it is also likely to trigger transition to turbulence. No evidence was found for a change from an organized array of rib vortices at one spanwise scale to a similar array at a larger spanwise scale.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 247 , February 1993 , pp. 321 - 337
Copyright
© 1993 Cambridge University Press

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