ON LOCAL ISOTROPY OF SMALL SCALE TEMPERATURE FLUCTUATIONS.

K. R. Sreenivasan, R. A. Antonia

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The measured skewness of the streamwise temperature derivative in both laboratory and atmospheric turbulent flows has been found to be non-zero (and of either sign) and essentially independent of Reynolds number, for a sufficiently large value of the Reynolds number. The apparent contradiction of this result with the hypothesis of local isotropy is examined here in the context of accumulating evidence for the presence of a highly organized large scale motion in turbulent shear flows. In the temperature trace, the signature of the large scale motion appears as a 'ramp-like' structure on which small scale fluctuations are superimposed. The measured non-zero skewness of the temperature derivative does not contradict local isotropy, as it appears to be almost entirely due to the non-isotropic large scale structure.

Original languageEnglish (US)
Title of host publicationUnknown Host Publication Title
PublisherNatl Res Counc of Can
StatePublished - 1800
EventInt Heat Transfer Conf, 6th - Toronto, Ont, Can
Duration: Aug 7 1978Aug 11 1978

Other

OtherInt Heat Transfer Conf, 6th
CityToronto, Ont, Can
Period8/7/788/11/78

ASJC Scopus subject areas

  • Engineering(all)

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