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Hybrid Methods in Engineering

ISSN Print: 1099-2391

Archives: Volume 1, 1999 to Volume 4, 2002

Hybrid Methods in Engineering

DOI: 10.1615/HybMethEng.v3.i2-3.30
10 pages

STUDY OF POLLUTANT TRANSPORT IN SURFACE BOUNDARY LAYER BY GENERALIZED INTEGRAL TRANSFORM TECHNIQUE

Jesus Salvador Perez Guerrero
Brazilian Nuclear Energy Commission - CNEN
Paulo Fernando Lavalle Heilbron Filho
Comissao Nacional de Energia Nuclear/MCT - Brazilian Nuclear Energy Commission, Rua General Severiano 90 — CEP 22294-900, Rio de Janeiro, Brazil
Luiz C. G. Pimentel
LAMMA/Dpto. Meteorologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
Marcio Cataldi
COPPE-Mecanica, Universidade Federal Do Rio De Janeiro, Rio de Janeiro, Brazil

ABSTRACT

A theoretical study was developed to obtain solutions of the atmospheric diffusion equation for various point sources, considering radioactive decay and axial diffusion, under neutral atmospheric conditions. An algebraic turbulence model available in the literature, based on the Monin—Obukhov similarity theory, was used to represent the turbulent transport in the vertical direction; in the longitudinal directions a constant mass eddy diffusivity was considered. The bidimensional transient partial differential equation, representative of the physical phenomena, was transformed into a coupled one-dimensional transient equation system by applying the generalized integral transform technique (GITT).The coupled system was solved numerically using a subroutine based on the lines method. In order to evaluate the computational algorithm, some representative physical situations were analyzed.