PRESSURE, VORTICITY AND VORTICES ASSOCIATED WITH SCALAR MICROFRONTS IN A LARGE-EDDY SIMULATION OF CANOPY FLOW

摘要

Many studies in the literature have focused on the occurrence and behavior of scalar microfronts in canopy flows. A scalar microfront is a tilted high scalar gradient region, which is characterized by a strong downward sweep motion upstream and an upward ejection motion downstream. The study of pressure, vorticity and vortices associated with scalar microfronts in canopy flow has been impeded by limited experimental data. It is very desirable to conduct a numerical simulation - large-eddy simulation (LES) specifically, in which pressure is obtained by solving a Poisson equation and vorticity is derived from the curl of the velocity vector. Vortices can be identified based on pressure and vorticity.