Determination of intermittency from the probability density function of a passive scalar

R. W. Bilger, R. A. Antonia, K. R. Sreenivasan

Research output: Contribution to journalArticle

Abstract

The probability density functions of temperature in the intermittent regions of heated jet and wake flows show a strong spike associated with the temperature of the unheated fluid. The fine structure of this spike fits a Gaussian curve quite closely, and the area under this Gaussian gives an accurate measure of 1-γ where γ is the intermittency factor. The standard deviation of the Gaussian is a measure of the noise due to residual temperature fluctuations in the free-stream and the electronic noise in the measurement system. The accuracy with which the intermittency can be determined is limited by the signal-to-noise ratio.

Original languageEnglish (US)
Pages (from-to)1471-1474
Number of pages4
JournalPhysics of Fluids
Volume19
Issue number10
StatePublished - 1976

Fingerprint

intermittency
probability density functions
Probability density function
scalars
spikes
jet flow
free flow
wakes
Temperature
temperature
standard deviation
Signal to noise ratio
signal to noise ratios
fine structure
Fluids
fluids
curves
electronics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Mechanics of Materials
  • Computational Mechanics
  • Fluid Flow and Transfer Processes

Cite this

Determination of intermittency from the probability density function of a passive scalar. / Bilger, R. W.; Antonia, R. A.; Sreenivasan, K. R.

In: Physics of Fluids, Vol. 19, No. 10, 1976, p. 1471-1474.

Research output: Contribution to journalArticle

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