Keywords: dense gas dispersion, Langevin equations, gravity spreading, Lagrangian particle model, dispersion modelling, air pollution, air quality
Proposal of a new Lagrangian particle model for the simulation of dense gas dispersion
A Lagrangian particle dispersion model for dense gas dispersion is proposed. It is a new version of MicroSpray oriented to simulate dense gas dispersion in urban or industrial environment, and includes the treatment of obstacles, complex terrain and low wind. The dense gas descent is computed by a 3D dynamical plume rise/descent model, the gravity spreading and bottom boundary condition are accounted for by empirical formulations. The differences between simulations obtained with the new model and with the standard one are presented. The model is validated against tracer field data gathered in the Thorney Island experiment 8.