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Observations of the variability of dissipation rates of turbulent velocity and temperature fields

  • Carl H. Gibson
  • Paul J. Masiello
Conference paper
Part of the Lecture Notes in Physics book series (LNP, volume 12)

Abstract

Velocity and temperature derivatives are squared and averaged for comparison with lognormality theories of Kolmogoroff, Obukhoff, Yaglom and Gurvich for the variability of local dissipation rates. Averaged squared derivatives were found to depart from lognormality for small values, especially velocity at lower Reynolds numbers, contrary to the proposal of Gurvich and Yaglom (1967). The universal constant μ of Kolmogoroff's third hypothesis was estimated to be 0.47 ± 0. 03 from the variation of \({{\sigma }}_{{{ln \dot u}}_{{r}} ^2 }^{{2}}\) with in(Lo/r), and 0. 49 ± 0. 2 from the variance of the ratio \(({{\dot u}}_{{r}} ^2 /{{\dot u}}_{{{2r}}} ^2 )\) for various scales r. The departure from lognormality for small values may be due to the fact that squared derivatives are not always proportional to the local dissipation rates.

Keywords

Dissipation Ratio Average Dissipation Rate Local Dissipation Rate Gaussian Plot Lognormality Test 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1972

Authors and Affiliations

  • Carl H. Gibson
    • 1
  • Paul J. Masiello
    • 1
  1. 1.University of CaliforniaSan Diego La Jolla

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