title: Effect of the Reynolds number on three- and four-particle diffusion in three-dimensional turbulence using kinematic simulation.
abstract: We study the evolution of three- and four-particle diffusion at large Reynolds numbers using kinematic simulation (KS) in isotropic turbulent flows. We vary the Reynolds number and find that the geometrical characteristics of triangles and tetrahedrons as functions of time do not depend on the Reynolds number but only on the ratio Delta0/L1 that is on the portion of the inertial range that was contained within the triangle or tetrahedron at the initial time. We also study the effect of the modeling of the unsteadiness term in the KS.
authors.affiliation: The University of Sheffield, Department of Mechanical Engineering, Mapping Street, Sheffield, S1 3JD, United Kingdom. F.Nicolleau@Sheffield.ac.uk
authors.forename: F
authors.initials: F
authors.lastname: Nicolleau
authors.forename: A
authors.initials: A
authors.lastname: Elmaihy