title: Angular statistics of Lagrangian trajectories in turbulence.
abstract: The angle between subsequent particle displacement increments is evaluated as a function of the time lag in isotropic turbulence. It is shown that the evolution of this angle contains two well-defined power laws, reflecting the multiscale dynamics of high-Reynolds number turbulence. The probability density function of the directional change is shown to be self-similar and well approximated by an analytically derived model assuming Gaussianity and independence of the velocity and the Lagrangian acceleration.
authors.affiliation: LMFA, CNRS UMR 5509, Ecole Centrale de Lyon, Université de Lyon, Ecully, France.
authors.forename: Wouter J T
authors.initials: WJ
authors.lastname: Bos
authors.affiliation: IUSTI, CNRS UMR 7343, Aix-Marseille University, Marseille, France.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Kadoch
authors.affiliation: M2P2, CNRS UMR 7340 & CMI, Aix-Marseille University, Marseille, France.
authors.forename: Kai
authors.initials: K
authors.lastname: Schneider