Energy flux fluctuations in a finite volume of turbulent flow

Details Energy flux fluctuations in a finite volume of turbulent flow Energy flux fluctuations in a finite volume of turbulent flow

2006-07-19

arxiv.org/abs/nlin/0607044v1

Phys. Rev. E 73, 026308 (2005)

Nonlinear Sciences

Chaotic Dynamics

10 Pages, 5 figures, 1 table

Scientific paper

10.1103/PhysRevE.73.026308

The flux of turbulent kinetic energy from large to small spatial scales is measured in a small domain B of varying size R. The probability distribution function of the flux is obtained using a time-local version of Kolmogorov's four-fifths law. The measurements, made at a moderate Reynolds number, show frequent events where the flux is backscattered from small to large scales, their frequency increasing as R is decreased. The observations are corroborated by a numerical simulation based on the motion of many particles and on an explicit form of the eddy damping.

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