High-resolution simulation of stack pollutant emissions

High-resolution simulation of stack pollutant emissions A. Perez-Foguet (1), A. Oliver (1), E. Rodríguez (2), J.M. Escobar (2), R. Montenegro (2), G. Montero (2) (1) LaCàN, Matemàtica Aplicada 3, UPC | (2) University Institute SIANI, University of Las Palmas de Gran Canaria A three-dimensional ai r pollution model fo r the short-term simulation of emission, transport and reaction of pollutants is presented. In the finite element simulation of these environmental processes over a complex terrain, a mesh generator capable of adapting itself to the topographic characteristics is essential, A local refinement of tetrahedra is used in order to capture the plume rise. Then a wind field is computed by using a mass-consistent model and perturbing its vertical component to introduce the plume rise effect. Finally, an Eulerian convection-diffusionreaction model is used to simulate the pollutant dispersion. Abstract Algorithm 1.Construct an adaptive tetrahedral mesh of the domain 2.Wind field simulation from experimental or forecasting data 3.Wind field modification including the plume rise effect 4.Air pollution simulation from stack emission data 3D FE Mesh Wind field Adapted to topography Including punctual emissaries 20m 500m Plume rise and refinement Transport-reaction simulation Mesh refinement to capture plume rise Wind perturbation to get plume rise m/s t = 10m t = 15m t = 30m We have introduced a new methodology for solving air pollution problems over a complex terrain. The adaptive three-dimensional mesh generation discretizes domains defined over complex terrains. The mass-consistent model obtains an ambient wind field that takes into account the complex orography. The local mesh refinement along the Gaussian plume, allows to perturb the ambient wind field to introduce the effect of the pollutant emissions The convection - diffusion - o nclusions g/m3 ambient wind field to introduce the effect of the pollutant emissions . The convection - diffusion - reaction equation obtains the values of concentration for all the pollutants. C o A. Oliver, G. Montero, R. Montenegro, E. Rodríguez, J.M. Escobar, A. Pérez-Foguet “Adaptive finite element simulation of air pollution over complex terrains ”, submitted to Environmental Modelling and Software (2011) References