The Dispersion Of A Light Solid Particle In
High-Reynolds Number Homogeneous
Stationary Turbulence: LES Approach With
Stochastic Sub-grid Model
Author(s)
M. Gorokhovski & A. Chtab
Abstract
In the framework of the LES approach, the simple stochastic model of turbulent
cascade with intermittency is introduced in order to represent the interaction
between a solid particle and turbulence at sub-grid scales. The computation of
the Lagrangian statistics of a light particle in homogeneous stationary turbulence
reproduced the results of measurements: (i) for the velocity statistics, the
numerical results were in agreement with classical Kolmogorov 1941
phenomenology; (ii) the computation of the velocity increment at different time
lags revealed, however, the strong intermittency.
Keywords: dispersion, LES approach, turbulence, intermittency.
1 Introduction
During the past years, it has been recognized that for computation of high-
Reynolds turbulent gas flow, the large eddy simulation (LES) approach
(integration of 3D filtered Navier-Stokes equations with effective sub-grid eddy
viscosity model) provides accurate local estimates of statistical quantities [1].
Recently [2], this approach was rigorously formulated from the group-theoretical
analyses. Applying the LES approach to computation of turbulent flow with
dispersed phase, one can expect that at each time, the momentum transport from
flow to particles can be predicted accurately. However there is a problem: the
interactions between gas and small particles are often characterized by length (or
time) scales, which are not resolved by LES approach. Such interactions need to
be modeled.
Keywords
dispersion, LES approach, turbulence, intermittency.
Related Book
Other papers in this volume
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