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The second-order moment structure of dispersing plumes and puffs

Published online by Cambridge University Press:  26 April 2006

David J. Thomson
David J. Thomson
Affiliation:
Meteorological Office, London Road, Bracknell, Berks RG12 2SZ, UK
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Abstract

A description of the behaviour of the second-order moments of concentration for a variety of source types is derived within the context of the classical phenomenology of isotropic turbulence. The sources considered include instantaneous area, line and point sources and can also be interpreted as relating to plumes from continuous point sources and continuous crosswind line sources in a strong uniform mean flow. A large number of different regimes are identified corresponding to different relative sizes of the many length scales involved. Perhaps the most interesting result is the identification of an ‘Inertial–meander’ subrange when the inertial-subrange eddies contribute to the meandering of the plume.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 320 , 10 August 1996 , pp. 305 - 329
Copyright
© 1996 Cambridge University Press

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