Numerical Simulation of Transport of Particles Emitted From Ground-Level Area Source Using Aermod and CFD

AbstractFugitive sources, including animal feeding operations, can contribute significantly to particulate pollution and cause environmental and health problems. Transport of particles emitted from these sources can be simulated using atmospheric dispersion models and computational fluid dynamics (CFD). This study evaluated the capability of AERMOD, the U.S. EPA preferred dispersion model, in modeling transport of particles emitted from area sources by comparing it to CFD. The two models responded similarly to effects of atmospheric stability and wind speed. AERMOD calculated lower downwind particle concentrations than CFD. In addition, predicted particle concentrations at locations downwind of the source remained constant with height in AERMOD but varied with height in CFD. Comparison of convection and diffusion rates simulated in CFD indicated that the assumptions on transport processes in AERMOD are suitable for modeling dispersion for area sources. However, estimated values for eddy diffusivity in cro...