Authors: Kang-Bin Lei, Kiwamu Kase, Nobuyuki Oshima, Toshio Kobayashi
Addresses: VCAD Modeling Team, VCAD System Research Program, RIKEN, 2-1, Hirosawa, Wako, Saitama, 351-0198, Japan. ' VCAD Modeling Team, VCAD System Research Program, RIKEN, 2-1, Hirosawa, Wako, Saitama, 351-0198, Japan. ' Division of Mechanical and Space Engineering, Graduate School of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo, 060-8628, Japan. ' Japan Automobile Research Institute, F12, 1-1-30, Shibadaimon, Minato-Ku, Tokyo, 105-0012, Japan
Abstract: Large Eddy Simulation (LES) of fully developed particle-laden turbulent channel flows were performed at Reynolds number 180 and 644, respectively. The effects of Stokes numbers, turbulent flows SGS fluctuations and inter-particle collisions on the distributions of solid particles were discussed. It was verified that, regardless of the Reynolds number of fluid flows, the maximum departure from randomness is when the ratio of the particle|s aerodynamic response time to the Kolmogorov time scale of flow was approximately one. In addition, the simulation results showed that the degrees of particle preferential concentration are selectively associated with the SGS fluctuations of fluid turbulence.
Keywords: particle-laden turbulent flows; LES; large eddy simulation; computational fluid dynamics; CFD; inter-particle collisions; Stokes number; solid particles; particle distribution; dynamic SGS model; preferential concentration; turbulent channel flows; full way coupling; fluid flow; aerodynamics.
Progress in Computational Fluid Dynamics, An International Journal, 2008 Vol.8 No.7/8, pp.413 - 423
Published online: 19 Nov 2008 *Full-text access for editors Access for subscribers Purchase this article Comment on this article