title: Energy flux fluctuations in a finite volume of turbulent flow.
abstract: The flux of turbulent kinetic energy from large to small spatial scales is measured in a small domain of varying size . The probability distribution function of the flux is obtained using a time-local version of Kolmogorov 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 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.
authors.affiliation: Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.
authors.forename: M M
authors.initials: MM
authors.lastname: Bandi
authors.forename: W I
authors.initials: WI
authors.lastname: Goldburg
authors.forename: J R
authors.initials: JR
authors.lastname: Cressman
authors.forename: A
authors.initials: A
authors.lastname: Pumir