The universal nature of zero-crossing time and velocity scales in turbulent shear flows

Promode Bandyopadhyay, A. K.M.F. Hussain

Research output: Contribution to journalArticlepeer-review

Abstract

Recent studies have shown that the turbulence production process in shear flows is not entirely random, but rather quasiperiodic in nature. Since the large eddies play a decisive role in these processes in all shear flows, it is instructive to see if they bear any common characteristics. The possible universal distributions1 of time and velocity scales (T, up) in the low-frequency component of the turbulent signals–defined, respectivley, as the interval between successive zero crossings and the intervening absolute peak value of the longitudinal velocity signal–have been explored in a number of flows. These include the self-preserving regions of a turbulent boundary layer, plane jet, circular jet, and plane mixing layer and the initial mixing regions of a plane jet and circular jet. Both T and up distributions show universal trends: T distributions agree well with the log normal distribution except in their extreme excursions, whereas up distributions are intermediate between log normal and Gaussian distributions.

Original languageEnglish
Pages (from-to)161-162
Number of pages2
JournalAIAA Journal
Volume23
Issue number2
DOIs
StatePublished - Feb 1985

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