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On the two-dimensional mixing region

Published online by Cambridge University Press:  29 March 2006

F. H. Champagne ,
Y. H. Pao  and
I. J. Wygnanski
F. H. Champagne
Affiliation:
Department of Applied Mechanics and Engineering Sciences, University of California, La Jolla
Y. H. Pao
Affiliation:
Flow Research, Inc., Seattle, Washington 98031
I. J. Wygnanski
Affiliation:
School of Engineering, Tel-Aviv University, Ramat-Aviv, Tel-Aviv, Israel 69978
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Abstract

An experimental investigation of the two-dimensional incompressible mixing layer was carried out. The measurements provide new information on the development of the mean and turbulent fields towards a self-preserving state and on the higher-order statistical characteristics of the turbulent field. The relevance of initial conditions to the development of the flow is discussed in the light of both present and previous data. Measurements of spectra, probability densities and moments to eighth order of all three velocity-component fluctuations at various transverse positions across the flow were carried out using an on-line digital data acquisition system. The probability density distributions of the derivative and the squared derivative of the longitudinal and lateral velocity fluctuations were also determined. Direct measurements of moments to eighth order of the velocity derivatives were attempted and are discussed in the light of the simultaneously measured histograms. The problems in obtaining higher-order statistical data are considered in some detail. Estimates of the integral time scale of many of the higher-order statistics are presented. The high wave-number structure was found to be locally anisotropic according to both spectral and turbulent velocity-gradient moment requirements. Higher-order spectra to fourth order of the longitudinal velocity fluctuations were measured and are discussed. Finally the lognormality of the squared longitudinal and lateral velocity-derivative fluctuations was investigated and the universal lognormal constant μ was evaluated.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 74 , Issue 2 , 23 March 1976 , pp. 209 - 250
Copyright
© 1976 Cambridge University Press

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