DNS/LES study of fluid-particle interaction in a turbulent channel flow at a low reynolds number

Abstract

This paper presents results of large eddy simulations (LES) combined with Lagrangian particle tracking and a point-force approximation of particle-laden turbulent channel flows with significant momentum exchange between the two phases. The effect of particle inertia, mass fraction, gravity, and interparticle collisions on the LES predictions is addressed and analyzed. The results are compared with those predicted from the direct numerical simulation (DNS) of the same particle-laden flow cases. LES with either the standard or the dynamic Smagorinsky model is capable to reproduce qualitatively the changes in the fluid turbulence intensities due to the presence of the particles. However, LES distributions significantly deviate from the DNS results, especially for particles with large response time at high mass fractions. © 2008 American Institute of Physics.