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On the development of noise-producing large-scale wavelike eddies in a plane turbulent jet

Published online by Cambridge University Press:  29 March 2006

Lee-Or Merkine  and
J. T. C. Liu
Lee-Or Merkine
Affiliation:
Division of Engineering, Brown University, Providence, Rhode Island 02912 Present address: Department of Meteorology, Massachusetts Institute of Technology Cambridge, Massachusetts 02139.
J. T. C. Liu
Affiliation:
Division of Engineering, Brown University, Providence, Rhode Island 02912
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Abstract

In this paper we study the development of large-scale wavelike eddies in a two-dimensional turbulent jet, extending earlier work on the mixing region (Liu 1974). The basic mean flow develops from one of mixing-region type with an initially specified boundary-layer thickness into a fully developed jet. This study brings out the role of the varicose and sinuous modes as they develop in a growing mean flow. In general, it is found that, for a given frequency parameter, the varicose mode has a shorter streamwise lifetime than the sinuous mode. For lower frequencies, the latter persists past the end of the potential core only to become subject to dissipation by the enhanced fine-scale turbulent activity in that region.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 70 , Issue 2 , 29 July 1975 , pp. 353 - 368
Copyright
© 1975 Cambridge University Press

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