Direct numerical simulation for three-dimensional gas-solid two-phase jet using two-way method and experimental verification

Current progress in the field of supercomputers has made possible the direct numerical simulation of the gas-solid two-phase jet based on the Navier-Stokes equation and the Lagrangian equation of particle motion without the use of any assumptions or simplified models. In this study, three-dimensional Eulerian air velocities and Lagrangian particle trajectories are simultaneously calculated to describe the interaction between particles and air using a two-way method. Although the mesh size is roughly seven times the Kolmogorov microscale, the calculated turbulent characteristics of air and particles (mean velocity distributions and turbulent intensity distributions) are in fairly good agreement with experimental data obtained using laser Doppler anemometry. This means that the simulation well describes the motion of large-scale eddies which play an important role in the formation of turbulent gas-solid two-phase flow.