Numeric simulation of pollutant dispersion by a control‐volume based on finite element method

Abstract

SUMMARYThe dispersion of pollutants in the environment is an issue of great interest as it directly affects air quality, mainly in large cities. Experimental and numerical tools have been used to predict the behavior of pollutant species dispersion in the atmosphere. A software has been developed based on the control-volume based on the finite element method in order to obtain two-dimensional simulations of Navier-Stokes equations and heat or mass transportation in regions with obstacles, varying position of the pollutant source. Numeric results of some applications were obtained and, whenever possible, compared with literature results showing satisfactory accordance.

On the construction and use of linear low-dimensional ventilation models

“…An important factor in the size of this ratio is the factor Gr=Re 2 a , where Re a is a Reynolds number based on average room velocity, that is, Re a ¼ Re=K: In Table 1, we provided an order-of-magnitude estimate of this factor in ventilation for a number of pollutant gasses encountered in indoor-ventilation studies (cf., e.g., Baek et al, 1999Baek et al, , 1997Brauer et al, 2002;Lawrence et al, 2005;Neves et al, 2011;Zhou and Kim, 2011). Using an order of magnitude of 100 for Gr =Re 2 ; and requiring t à acr =t à g <10 À2 À 10 À3 ; leads to the condition a ‡ C* · 10 4 -C* · 10 5 .…”

Numerical Simulation by High-Order Explicit Finite Difference Method to Solve the Burgers Equation

“…Several other works [10]- [16] have sought to solve nonlinear problems in an implicit or explicit way, but one of the main questions that still arises is the best composition between spatial and transient discretization for solving nonlinear problems.…”

3D Unsteady Heat Transfer in Multi-Connected Domains via LSFEM: A Case Study

“…The heat transfer appear in most engineering applications, in particular, the heat transfer through heat conduction [1,2] is of great importance especially in applications of solid mechanics. It is of course known that the application of numerical methods to heat conduction problems in general present good results when the domain is uniquely connected [3][4][5][6][7][8], which is not always true when it comes to multi-connected domains, as fins, air conditioners, heat exchangers in general. In this paper it is intended to take advantage a computer code written in Fortran language that was constructed from a formulation of the heat conduction equation by LSFEM.…”