Meshing Effects On CFD Modelling Of
Atmospheric Flow Over Buildings Situated On
Ground With High Terrain
Author(s)
A. Karim, P. Nolan & A. Qubian
Abstract
A Computational Fluid Dynamics (CFD) study was carried out on the wind
environment and vehicle pollution dispersion from a newly built by-pass
adjacent to the Whatman International site in Maidstone, UK.
The site buildings are sited on ground incorporating an area of high terrain,
accordingly they were modelled using Geographical Information System (GIS).
The site contains a substantial number of trees of differing species which were
extensively surveyed and modeled using a simple 2D momentum sink dependent
on the tree Leaf Area Density (LAD).
One of the important factors which has a significant effect on CFD results is
the computational mesh. The purpose of this paper is to investigate the effects of
using different mesh approaches for both easterly and southerly wind scenarios
and the results are compared with that of field measurements taken at the site
which include the CO concentration and wind velocity.
The CFD results showed that the hexahedral mesh delivers a higher level of
agreement with field measurements than the tetrahedral dominant mesh and this
is mainly due to the higher truncation error in the tetrahedral cell type.
It was also found that the tetrahedral dominant mesh can be significantly
improved by applying different numerical solving techniques such as the Nodebased
gradient solver.
Keywords: CFD, pollution dispersion modelling, grid effect, urban environment.
1 Introduction
The Whatman International factory is sited in Maidstone, Kent / UK, the factory
consists of a number of buildings which are sited on a ground characterized by
Keywords
CFD, pollution dispersion modelling, grid effect, urban environment.
Related Book
Other papers in this volume
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