Determination of intermittency from the probability density function of a passive scalar
- 1 October 1976
- journal article
- conference paper
- Published by AIP Publishing in Physics of Fluids
- Vol. 19 (10) , 1471-1474
- https://doi.org/10.1063/1.861348
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.Keywords
This publication has 4 references indexed in Scilit:
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- Conditionally sampled measurements in a heated turbulent jetJournal of Fluid Mechanics, 1975
- Detection of the turbulent-nonturbulent interface in slightly heated turbulent shear flowsPhysics of Fluids, 1974
- Use of a pseudo-turbulent signal to calibrate an intermittency measuring circuitJournal of Fluid Mechanics, 1974