title: Intermittency and exponent field dynamics in developed turbulence.
abstract: Spatiotemporal dynamics of intermittency in association with coarse-grained energy-dissipation rate fluctuations is discussed. This is done first by phenomenologically constructing the probability density for exponent field fluctuations that is introduced to characterize the energy-dissipation rate field, and then by proposing the Langevin dynamics derived with the projection-operator method on the basis of the Navier-Stokes equation. With a Gaussian approximation for exponent fluctuations, spatiotemporal correlation functions for coarse-grained energy-dissipation rate fluctuations are explicitly obtained.
authors.affiliation: Department of Applied Analysis and Complex Dynamical Systems, Graduate School of Informatics, Kyoto University, Kyoto 606-8501, Japan. fujisaka@i.kyoto-u.ac.jp
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Fujisaka
authors.forename: Yasuya
authors.initials: Y
authors.lastname: Nakayama