Transports of air particulate matters in the atmospheric boundary layer-numerical studies using Eulerian and Lagrangian methods

Transports of air particulate matters (PM) from face sources in the atmospheric boundary layer (ABL) are investigated by the Eulerian single fluid model and the Lagrangian trajectory method, respectively. Large eddy simulation is used to simulate the fluid phase for high accuracy in both two approaches. The mean and fluctuating PM concentrations, as well as instantaneous PM distributions at different downstream and height positions, are presented. Higher mean and fluctuating particle concentrations are predicted by the Eulerian approach than the Lagrangian one. For the Lagrangian method, PM distributions cluster near the ground-wall because of the preferential dispersion of inertial particles by turbulence structures in the ABL, while it cannot be obtained by the Eulerian single fluid method, because the two-phase velocity differences are neglected in the Eulerian method.