scholarly journals Fenômeno de meandro do vento e a função de autocorrelação calculada com base na concentração de poluentes simulada pelo modelo transiente 3D-GILTT

2020 ◽  
Vol 42 ◽  
pp. e28
Author(s):  
Viliam Cardoso da Silveira ◽  
Daniela Buske ◽  
Régis Sperotto de Quadros ◽  
Glênio Aguiar Gonçalves ◽  
Guilherme Jahnecke Weymar
Keyword(s):  
Diffusion Equation ◽  
Dispersion Model ◽  
Three Dimensions ◽  
Horizontal Wind ◽  
Transient Model ◽  
Advection Diffusion Equation ◽  
Advection Diffusion ◽  
Laplace Transform Technique ◽  
Integral Laplace Transform ◽  
Pollutants Dispersion

The aim of this work is to present a pollutants dispersion transient model in low wind conditions to simulate the behavior of the pollutants plume in the atmosphere, considering in the model the u e v horizontal wind components simulated by the LES-PALM model. The dispersion model is based in the advection-diffusion equation and represent by this methodology the wind meandering phenomenon. The Generalized Integral Laplace Transform Technique in three dimensions (3D- GILTT) solves the transient advection-diffusion equation. The data utilized to initialize the simulations are data of the low wind INEL (Idaho National Engineering Laboratory) experiment accomplished in EUA. The results show that the dispersion model reproduces the wind meandering phenomenon, in other words, the autocorrelation function of the concentration simulated over an hour presents the negative lobule, similarly to observed lobules in the u and v wind components. Therefore, the model simulates the pollutants plume in a satisfactory way and can be used to air quality regulatory applications in low wind and wind meandering conditions.

scholarly journals Simulation of three-dimensional transient pollutant dispersion in low wind conditions using the 3D-GILTT technique

2020 ◽  
Vol 5 (6) ◽  
Author(s):  
Viliam Cardoso Da Silveira ◽  
Daniela Buske ◽  
Régis Sperotto De Quadros
Keyword(s):  
Diffusion Equation ◽  
Integral Transform ◽  
Dispersion Model ◽  
Three Dimensional ◽  
Pollutant Dispersion ◽  
Transient Model ◽  
Advection Diffusion Equation ◽  
Advection Diffusion ◽  
Laplace Transform Technique ◽  
The Usa

The aim of this work is to present a transient model in low wind conditionsto simulate the pollutants dispersion in the atmosphere. The dispersion model is based in the advection-diffusion equation and it considers the zonal and meridional components of the wind. The transient advection-diffusion equation is solved using integral transform techniques. In this work, the generalized integral transform and Laplace techniques are used, known in the literature as GILTT and which applied to the three-dimensional problem is called 3D-GILTT (Three-dimensional Generalized Integral Laplace Transform Technique). To validate the model, data from INEL experiment (Idaho National Engineering Laboratory) carried out in the USA were used. The model simulates the observed concentrations in a satisfactory way and can be used for regulatory air quality applications

scholarly journals Modelo de pluma segmento com velocidades estocásticas para dispersão atmosférica em condições de vento fraco

2020 ◽  
Vol 42 ◽  
pp. e11
Author(s):  
Camila Fávero ◽  
Glênio Aguiar Gonçalves ◽  
Daniela Buske ◽  
Régis Sperotto de Quadros ◽  
Viliam Cardoso da Silveira
Keyword(s):  
Computational Cost ◽  
Three Dimensional ◽  
Pollutant Dispersion ◽  
Wind Condition ◽  
Advection Diffusion Equation ◽  
Advection Diffusion ◽  
Laplace Transform Technique ◽  
Integral Laplace Transform ◽  
Variable Separation Method ◽  
Temporal Variable

This work presents an analytical solution for the transient three-dimensional advection-diffusion equation. This solution, obtained from a combination of the variable separation method and GILTT (Generalized Integral Laplace Transform Technique) is used to simulate the pollutant dispersion in the atmosphere. The new solution has the advantage of not requiring a numerical inversion performed in the temporal variable in works using only GILTT technique. The model was tested in low wind condition, with diffusion in transverse and longitudinal directions and stochastic speeds. Simulations were performed for the INEL experiment. The analytical character of the model makes it simple, which represents advantages in its development and implementation, as well as in the computational cost for execution.

scholarly journals Modelo para dispersão de poluentes com condições de contorno reflexivas e simulação de dados no CALPUFF

2018 ◽  
Vol 40 ◽  
pp. 257
Author(s):  
Jaqueline Fischer Loeck ◽  
Juliana Schramm ◽  
Bardo Bodmann
Keyword(s):  
Mathematical Model ◽  
Power Plant ◽  
Diffusion Equation ◽  
Thermoelectric Power ◽  
Model Based ◽  
Advection Diffusion Equation ◽  
Advection Diffusion ◽  
Pollutants Dispersion ◽  
Thermoelectric Power Plant

The present work is an attempt to simulate the pollutants dispersion in the surroundings of the thermoelectric power plant located in Linhares from a new mathematical model based on reflective boundaries in the deterministic advection-diffusion equation. In addition to the advection-diffusion equation with reflective boundaries, it was used data simulated with the CALPUFF model. The exposed model was validated previously with the Hanford and Copenhagen experiments.

Sign in / Sign up

Export Citation Format

Share Document