Author(s)

Neyva Maria Lopes Romeiro¹, Eliandro Rodrigues Cirilo¹, Paulo Laerte Natti¹, Letícia Mayumi Doy Okamoto², Tainá Julianotti³

¹Department of Mathematics, State University of Londrina and Member of the Simulation and Numerical Analysis Laboratory—LabSan, Paraná, Brazil.
²Graduated in Computer Science, State University of Londrina, Paraná, Brazil.
³Master’s Student, Applied and Computational Mathematics—PGMAC, State University of Londrina, Paraná, Brazil.

This work proposes a way of modelling two-dimensional complex meshes using elliptic equations, which the computational grid coincides with the problem geometry, making computational processing more suitable. A multiblock technique was used in order to achieve a better representation of the problem domain. In this way, numerical simulations of the movement and dispersion of pollutant emissions in the atmosphere are presented in the generated domains, using the Navier-Stokes pollutant transport equations. The curvilinear coordinates and the finite difference method are used for the discretization. The model was verified in two tests. In the first test, three cases were proposed, with geometries containing a chimney followed by an obstacle, using different chimney heights, and the obstacle height was fixed. The test aims to verify the vortices appearance, in the blocks, to obtain agreement with as presented in the literature. In the second test, the geometry is described by a chimney and an obstacle that represents one of the mountains in the valley. The performed tests made possible to verify that the height of the chimney can be considered a determining factor to describe the dispersion of pollutants, as well as their concentration in the proximity of industrial areas.

Atmosphere, Valley, Multiblock, Navier-Stokes, Transport Equation

Romeiro, N. , Cirilo, E. , Natti, P. , Okamoto, L. and Julianotti, T. (2021) Chimney Height, a Determining Factor in the Dispersion of Pollutants and Their Concentration. World Journal of Engineering and Technology, 9, 173-193. doi: 10.4236/wjet.2021.91013.