Please use this identifier to cite or link to this item: http://hdl.handle.net/11422/8811
Type: Artigo
Title: Integral transform solutions for atmospheric pollutant dispersion
Author(s)/Inventor(s): Almeida, Gevaldo Lisboa de
Pimentel, Luiz Claudio Gomes
Cotta, Renato Machado
Abstract: Indisponível.
Abstract: A transient two-dimensional advection–diffusion model describing the turbulent dispersion of pollutants in the atmosphere has been solved via the Generalized Integral Transform Technique (GITT), by two different schemes. The first approach performs numerical integration of the transformed system using available routines for initial value problems with automatic error control. In spite of the time-consuming character of such a scheme, its flexibility allows the handling of problems involving time-dependent meteorological parameters such as wind speed and eddy diffusivities. The second approach works fully analytically being thus intrinsically more robust and economic, although not directly applicable in dealing with time-dependent parameters. For the test problem used in this work, both methods agree very well with each other, as well as with a known analytical solution for a simpler formulation used as benchmark. The impact of the longitudinal diffusivity on the stiffness of the ordinary differential equation (ODE) system arising from the integral transformation has been assessed through the processing time demanded to solve it when the numerical approach is used. The observed CPU times show that the analytical approach is clearly preferable unless the problem involves time-dependent parameters.
Keywords: Integral transforms
Dispersion
Hybrid methods
Advection-diffusion
Atmospheric pollution
Subject CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOS
Production unit: Núcleo Interdisciplinar de Dinâmica dos Fluidos
Publisher: Springer
In: Environmental Modeling and Assessment
Volume: 13
Issue: 1
Issue Date: 27-Jan-2007
DOI: 10.1007/s10666-006-9072-4
Publisher country: Brasil
Language: eng
Right access: Acesso Aberto
ISSN: 1420-2026
Appears in Collections:Engenharias

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