Numerical investigation on the effect of building overhang on the flow within idealized two dimensional Street Canyon / Muhammad Fatih Ibrahim

The purpose of overhang is to protect the pedestrian from a specific weather such as heavy rain and sunlight heat, which however conflicts with the previous studies on the effect of the overhang to the air quality within the canyon. Thus, the aim of this research his to investigate the influence of...

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Main Author:	Ibrahim, Muhammad Fatih
Format:	Thesis
Language:	English
Published:	2022
Subjects:	Architectural drawing and design
Online Access:	https://ir.uitm.edu.my/id/eprint/77709/1/77709.pdf
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id	my-uitm-ir.77709
record_format	uketd_dc
spelling	my-uitm-ir.777092023-05-29T04:56:16Z Numerical investigation on the effect of building overhang on the flow within idealized two dimensional Street Canyon / Muhammad Fatih Ibrahim 2022 Ibrahim, Muhammad Fatih Architectural drawing and design Details in building design and construction.Including walls, roofs The purpose of overhang is to protect the pedestrian from a specific weather such as heavy rain and sunlight heat, which however conflicts with the previous studies on the effect of the overhang to the air quality within the canyon. Thus, the aim of this research his to investigate the influence of buildings overhang on the airflow and pollutant dispersion in the street canyon. The flow pattern and the pollutant concentration were evaluated by set up the overhang on the two types of typical building geometries namely flat roof and pitched roofs. This paper reported the results of the velocity flow field in a two-dimensional street canyon with different building overhang configuration using a computational fluid dynamics (CFD) by employing Reynolds Average Navier Stokes(RANS) approach. Simulation was conducted with a constant aspect ratio of W/H = 1,where W is the street width and H is the building height. A total of twelve cases of flat roof and pitched roof with no overhang, overhang on both sides, or overhang on either the leeward or windward side were simulated in order to get the understanding on the flow behaviour. The result shows that for the case of flat roof building, the pollutant concentration is higher on the windward side than on leeward side except for the case of 0.5HW as the counter-rotating vortex occur inside the canyon. On the contrary, the pollutant concentration is higher on the windward side for the case of pitched roof except for the case of pitched roof buildings with no overhang. The ratio of the canyon opening to the building height for some cases with a long overhang can be classified as a deep canyon and the flow regime are categorized as a skimming flow. Thus, in this study the case without overhang performs a better ventilation as the flow from the outer layer can penetrate well into the street canyon. 2022 Thesis https://ir.uitm.edu.my/id/eprint/77709/ https://ir.uitm.edu.my/id/eprint/77709/1/77709.pdf text en public masters Universiti Teknologi MARA (UiTM) College of Engineering Mohamad, Mohd Faizal
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Mohamad, Mohd Faizal
topic	Architectural drawing and design Architectural drawing and design
spellingShingle	Architectural drawing and design Architectural drawing and design Ibrahim, Muhammad Fatih Numerical investigation on the effect of building overhang on the flow within idealized two dimensional Street Canyon / Muhammad Fatih Ibrahim
description	The purpose of overhang is to protect the pedestrian from a specific weather such as heavy rain and sunlight heat, which however conflicts with the previous studies on the effect of the overhang to the air quality within the canyon. Thus, the aim of this research his to investigate the influence of buildings overhang on the airflow and pollutant dispersion in the street canyon. The flow pattern and the pollutant concentration were evaluated by set up the overhang on the two types of typical building geometries namely flat roof and pitched roofs. This paper reported the results of the velocity flow field in a two-dimensional street canyon with different building overhang configuration using a computational fluid dynamics (CFD) by employing Reynolds Average Navier Stokes(RANS) approach. Simulation was conducted with a constant aspect ratio of W/H = 1,where W is the street width and H is the building height. A total of twelve cases of flat roof and pitched roof with no overhang, overhang on both sides, or overhang on either the leeward or windward side were simulated in order to get the understanding on the flow behaviour. The result shows that for the case of flat roof building, the pollutant concentration is higher on the windward side than on leeward side except for the case of 0.5HW as the counter-rotating vortex occur inside the canyon. On the contrary, the pollutant concentration is higher on the windward side for the case of pitched roof except for the case of pitched roof buildings with no overhang. The ratio of the canyon opening to the building height for some cases with a long overhang can be classified as a deep canyon and the flow regime are categorized as a skimming flow. Thus, in this study the case without overhang performs a better ventilation as the flow from the outer layer can penetrate well into the street canyon.
format	Thesis
qualification_level	Master's degree
author	Ibrahim, Muhammad Fatih
author_facet	Ibrahim, Muhammad Fatih
author_sort	Ibrahim, Muhammad Fatih
title	Numerical investigation on the effect of building overhang on the flow within idealized two dimensional Street Canyon / Muhammad Fatih Ibrahim
title_short	Numerical investigation on the effect of building overhang on the flow within idealized two dimensional Street Canyon / Muhammad Fatih Ibrahim
title_full	Numerical investigation on the effect of building overhang on the flow within idealized two dimensional Street Canyon / Muhammad Fatih Ibrahim
title_fullStr	Numerical investigation on the effect of building overhang on the flow within idealized two dimensional Street Canyon / Muhammad Fatih Ibrahim
title_full_unstemmed	Numerical investigation on the effect of building overhang on the flow within idealized two dimensional Street Canyon / Muhammad Fatih Ibrahim
title_sort	numerical investigation on the effect of building overhang on the flow within idealized two dimensional street canyon / muhammad fatih ibrahim
granting_institution	Universiti Teknologi MARA (UiTM)
granting_department	College of Engineering
publishDate	2022
url	https://ir.uitm.edu.my/id/eprint/77709/1/77709.pdf
_version_	1783736159688458240

Numerical investigation on the effect of building overhang on the flow within idealized two dimensional Street Canyon / Muhammad Fatih Ibrahim

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