Numerical simulation of flows and pollution dispersion in atmospheric boundary layer.

The work deals with mathematical and numerical modelling of flow and pollution dispersion in atmospheric boundary layer. Starting from general formulation of conservation laws governing the flow dynamics of general fluid, a series of approximations is developed. The dimensional analysis of the basic governing systems is presented as a basic tool for development of simplified models. The range of applicability of these simple models is discussed. Selected models are studied in more detail and suitable numerical methods are proposed for their solution. The corresponding finite-volume and finite-difference schemes are developed and described in detail. Deeper analysis of a semi-implicit scheme, used for the solution of the Boussinesq approximation, is performed with special focus on numerical dissipation and dispersion properties of the scheme. The latest generation model based on Boussinesq approximation is used in numerical experiments in order to validate the method. Simple flows and pollution dispersion over 2D and 3D sinusoidal hills are studied. Results of computations are compared with experimental or numerical data published in available litarature. Based on this numerical experience the model is applied to the large scale circulation in mediterranean coastal area. The method functionality is extended for the flow over real orography, with the use of real boundary data and for unsteady boundary conditions. Dome ways of future research and extension of the project are proposed and discussed.Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi