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second revision of the manuscript (v.2.0), Sept.2008 1 Filtered particle tracking in isotropic turbulence
 

Summary: second revision of the manuscript (v.2.0), Sept.2008 1
Filtered particle tracking in isotropic turbulence
and stochastic modeling of subgrid-scale
dispersion
By Jacek Pozorski AND Sourabh V. Apte
A numerical study based on the Eulerian-Lagrangian formulation is performed for
dispersed phase motion in a turbulent flow. The effect of spatial filtering, commonly
employed in large-eddy simulations, and the role of the subgrid scale turbulence on the
statistics of heavy particles, including preferential concentration, are studied through a
priori analysis of DNS of particle-laden forced isotropic turbulence. A stochastic Langevin
model is proposed to reconstruct the residual (or subgrid scale) fluid velocity along par-
ticle trajectories. In simulations where the subgrid scale kinetic energy attains 3035% of
the total we observe the impact of residual fluid motions on particles of a smaller inertia.
It is shown that neglecting the influence of subgrid scale fluctuations has a significant
effect on the preferential concentration of those particles. The computation results for
a selection of particle inertia parameters are performed to appraise the model through
comparisons of particle turbulent kinetic energy and the statistics of preferential concen-
trations.
1. Introduction
Numerical studies of two-phase flows with dispersed droplets or solid particles con-

  

Source: Apte, Sourabh V. - School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University

 

Collections: Engineering