Turbulence modification in a homogeneous turbulent shear flow laden with small heavy particles

摘要

Numerical simulations have been conducted for a homogeneous turbulent shear flow laden with small heavy particles in order to investigate the modification of turbulence structures in shear flows due to particles. The effects on the turbulence modification of gravitational settling of particles in the sheared direction are examined for the particles whose response times are comparable to the Kolmogorov time-scale of turbulence. It is found that the growth rate of turbulence energy of the carrier fluid, which is reduced by the particles in zero gravity, is increased by the effect of weak gravity through the enhancement of Reynolds shear stress, but de- creased by the effect of strong gravity through the increase in drag dissipation.