Local isotropy and large structures in a heated turbulent jet

K. R. Sreenivasan, R. A. Antonia, D. Britz

Research output: Contribution to journalArticle

Abstract

Recent measurements of the skewness of the derivative of the temperature fluctuation θ, implying the breakdown of local isotropy even in high Reynolds number shear flows, are examined. Using the temperature signal in a slightly heated axisymmetric jet, a detailed quantitative analysis is made of the suggestion that the observed presence of a well-defined large-scale pattern of the temperature signal in these flows is responsible for this breakdown. A selective ensemble averaging technique is used for separating this pattern from fluctuations superposed on it. The technique is extended to extract the large-scale patterns in simultaneously measured axial (u), radial (v) velocity fluctuations, and the products uv, uθ and vθ, so that it is possible to separate contributions of these patterns from those of the superposed fluctuations to several important turbulent quantities. The mean shape of the patterns, their degree of anisotropy and correlation, and their contribution to turbulence intensities and Reynolds shear stress are obtained. Probability densities and spectra of these quasi-homogeneous superposed fluctuations are also obtained. Results show that the fluctuations are consistent with local isotropy and make the dominant contribution to the turbulence intensities, that the large-scale patterns are responsible for the observed skewness values of the derivative of v, and that the fluctuations may be responsible for a significant part of the turbulent momentum and heat transport, especially in the region of the jet where the turbulent energy production is substantial.

Original languageEnglish (US)
Pages (from-to)745-775
Number of pages31
JournalJournal of Fluid Mechanics
Volume94
Issue number4
DOIs
StatePublished - 1979

Fingerprint

turbulent jets
isotropy
Turbulence
Derivatives
Shear flow
skewness
Temperature
Shear stress
Momentum
Reynolds number
Anisotropy
breakdown
turbulence
Chemical analysis
Reynolds stress
high Reynolds number
shear flow
radial velocity
quantitative analysis
shear stress

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics

Cite this

Local isotropy and large structures in a heated turbulent jet. / Sreenivasan, K. R.; Antonia, R. A.; Britz, D.

In: Journal of Fluid Mechanics, Vol. 94, No. 4, 1979, p. 745-775.

Research output: Contribution to journalArticle

Sreenivasan, K. R. ; Antonia, R. A. ; Britz, D. / Local isotropy and large structures in a heated turbulent jet. In: Journal of Fluid Mechanics. 1979 ; Vol. 94, No. 4. pp. 745-775.
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