Intermittency exponent of the turbulent energy cascade.

نویسندگان

  • Jochen Cleve
  • Martin Greiner
  • Bruce R Pearson
  • Katepalli R Sreenivasan
چکیده

We consider the turbulent energy dissipation from one-dimensional records in experiments using air and gaseous helium at cryogenic temperatures, and obtain the intermittency exponent via the two-point correlation function of the energy dissipation. The air data are obtained in a number of flows in a wind tunnel and the atmospheric boundary layer at a height of about 35 m above the ground. The helium data correspond to the centerline of a jet exhausting into a container. The air data on the intermittency exponent are consistent with each other and with a trend that increases with the Taylor microscale Reynolds number, R(lambda), of up to about 1000 and saturates thereafter. On the other hand, the helium data cluster around a constant value at nearly all R(lambda), this being about half of the asymptotic value for the air data. Some possible explanation is offered for this anomaly.

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Comment on "Intermittency exponent of the turbulent energy cascade".

It is argued that the method used by Cleve et al. [Phys. Rev. E 69, 066316 (2004)], to determine the intermittency exponent mu is biased at moderate Reynolds numbers R lambda. Thus, the claimed dependence of mu upon (R lambda) is questionable. Other determinations give a constant value for mu.

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عنوان ژورنال:
  • Physical review. E, Statistical, nonlinear, and soft matter physics

دوره 69 6 Pt 2  شماره 

صفحات  -

تاریخ انتشار 2004