Direct numerical simulation of particle statistics and turbulence modification in vertical turbulent channel flow

摘要

Results are presented for the behavior of particle-laden gases in a mode-rate Reynolds number vertical channel down flow. The effects of particle feedback on the gas-phase turbulence and particle concentration are studied. A direct numerical simulation including models of wall-particle interaction was conducted. It is confirmed that particle feedback causes the turbulence intensities to become more non-isotropic as the particle loading is increased. The particles tend to increase the characteristic length scales of the fluctuations in the streamwise velocity, which reduces the transfer of energy between the streamwise and the transverse velocity components. The particle concentration exhibits a maximum close to the wall and a slight increase in the middle of the channel.