Velocity Field Modelling for Pollutant Plume Using 3-D Adaptive Finite Element Method

Air pollution models usually start from the computation of the velocity field of a fluid. In this paper, we present a model for computing that field based on the contribution of the observed wind flow and the vertical buoyancy or momentum plume rise defined by a Gaussian plume model. This initial velocity field is adjusted to verify incompressibility and impermeability conditions by using a mass consistent model. In this environmental modelling that occur in a three-dimensional domain defined over complex terrain, a mesh generator capable of adapting itself to the topographical data and to the numerical solution is essential. Here, the unstructured tetrahedral meshes are generated by combining the use of a refinement/derefinement algorithm for two-dimensional domains and a tetrahedral mesh generator based on Delaunay triangulation. Occasionally in this process, low quality or even inverted elements may appear. A simultaneous untangling and smoothing procedure allows to optimis...

• Type: Conference
• Year: 2004
• Where: ICCS
• Authors: Gustavo Montero, Rafael Montenegro, José María Escobar, Eduardo Rodríguez, José María González-Yuste
• Keywords: Gaussian Plume Model, ICCS 2004, Mesh Generator, Velocity field