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On the simulation of particle trajectories in turbulent flows

Reynolds, A. M. and Lo Iacono, Giovanni (2004) On the simulation of particle trajectories in turbulent flows Physics of Fluids, 16 (12). pp. 4353-4358.

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A different class of stochastic model, comprising of the Langevin equation with a random time scale, for the simulation of fluid velocities along particle trajectories in high Reynolds-number turbulent flows is formulated. These velocities are neither purely Lagrangian nor purely Eulerian in character. The distribution of time scales is chosen to ensure that the modeled form of the fluid-velocity structure function and spectral functions are compatible with Kolmogorov similarity scaling and with the scaling analysis of Fung, Hunt, and Perkins [Proc. R. Soc. London, Ser. A 459, 445 (2003)]. It is shown that the model accounts naturally for the crossing trajectory effect and integral time scales are compatible with the much used parameterizations advocated by Csanady [J. Atmos. Sci. 20, 201 (1963)] and by Frenkiel [Adv. Appl. Mech. 3, 61 (1953)]. Model predictions for particle dispersion in grid generated turbulence are shown to be in close accord with the experimental data of Snyder and Lumley [J. Fluid Mech. 48, 41 (1971)].

Item Type: Article
Divisions : Faculty of Health and Medical Sciences > School of Veterinary Medicine
Authors :
Reynolds, A. M.
Lo Iacono,
Date : October 2004
DOI : 10.1063/1.1804551
Copyright Disclaimer : © 2004 American Institute of Physics
Depositing User : Karen Garland
Date Deposited : 22 Nov 2017 15:56
Last Modified : 16 Jan 2019 19:04

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