On the necessity of including the turbulence experienced by an inertial particle in Lagrangian random-walk models

摘要

Many Lagrangian models have been developed in the literature in order to simulate the dispersion of particles in turbulent gas and liquid flows. The purpose of the present study is to critically analyze the impact of different fluid autocorrelation functions on the behavior of the dispersed phase in homogeneous isotropic turbulence. The "purely Lagrangian" autocorrelation, well-appropriate for turbulent diffusion problems, needs to be modified by other more sophisticated autocorrelation coefficients, including either space-time characteristics or better particle parameters to obtain appropriate numerical dispersion results in concordance with a recent theory. (C) 2003 Elsevier Ltd. All rights reserved.