Effect of large-scale intermittency and mean shear on scaling-range exponents in a turbulent jet
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(Published version)
Date
2001
Authors
Mi, Jianchun
Antonia, R. A.
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Journal article
Citation
Physical Review E, 2001; 64(2):026302
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J. Mi and R. A. Antonia
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Abstract
The present study investigates the combined impact of the intermittency associated with the turbulent-nonturbulent interface and the mean shear rate in an axisymmetric jet on the structure of turbulence in the scaling range, where the spectrum exhibits a power-law behavior. Second-order structure functions, autocorrelations of the dissipation rate, and spectra of both the longitudinal velocity fluctuation and the passive temperature fluctuation are measured at a distance of 40 diameter downstream from the nozzle exit. All the scaling range exponents are influenced by the large-scale intermittency and the mean shear. The scalar fluctuation is much more sensitive to the variation in large-scale intermittency than the velocity fluctuation.
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School of Mechanical Engineering
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©2001 American Physical Society