http://lattes.cnpq.br/6373325954844339; GOMES, Valério de Araújo.
Abstract:
The development of mathematical models, which simulate the dispersion of
pollutants in the atmosphere using computational fluid dynamics, has been increasingly
intense due to the technological evolution of computational routines. For the closure of
the terms representing the turbulence, the model of standard two equations k- is the most
widely used. However, when the effects of low Reynolds numbers should be considered
(when molecular viscosity cannot be neglected), damping functions should be inserted
resulting in a kind of k- for low Reynolds numbers. This thesis aims to present the
development of a mathematical atmospheric dispersion model, whose scientific
contribution is the development of empirical equations to define the damping function
(𝑓�µ) in the calculation of turbulent viscosity, in addition the functions "walls" commonly
used by commercial computer codes. As a computational tool, CFX® software has been
used to perform fluid dynamics simulation. For the validation of the model, the data from
the Copenhagen experiment were used. The statistical indices of the model were also
compared with the results of other studies found in the literature. The results showed that
the proposed methodology was able to simulate the field experiment with a very
satisfactory level, reaching a normalized mean square error (NMSE) of 0.02 and a
correlation factor (Color) of 0.95.