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
DOIs
StatePublished - Jan 1 1976

ASJC Scopus subject areas

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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