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Direct numerical simulation of interacting inertial particles in homogeneous isotropic turbulence

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.1510
pages 1472-1475

Ryo Onishi
Earth Simulator Center, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku Yokohama Kanagawa 236-0001, Japan also Department of Aeronautics, Imperial College London, SW7 2AZ, UK

John Christos Vassilicos
Turbulence, Mixing and Flow Control Group, Department of Aeronautics Imperial College London, London SW7 2AZ, United Kingdom

Keiko Takahashi
Earth Simulator Center, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku Yokohama Kanagawa 236-0001, Japan

要約

This study has developed an efficient parallel simulation code for interacting inertial particles in homogeneous isotropic turbulence. Flow is computed with a fourth-order finite-difference method and particles are tracked with the Lagrangian method. The code adopts an MPI library for a d istributed-memory parallelization and is designed to minimize the MPI communication, which leads to a high parallel performance. The code has been run to obtain collision statistics of a monodisperse system with St =0.4 particles, where St is the Stokes number representing the particle relaxation time relative to the Kolmogorov time. The attained Taylor-microscale based Reynolds number Rλ ranges from 50 to over 500. This wide range of Rλ has potential to reveal a Reynolds dependency of collision statistics.

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