Flow structure in modern cities: wind tunnel investigation

Natural ventilation dominates the heat dissipation and pollutant dispersion in modern cities. Investigations into the flow structure and urban heat island in the Kuala Lumpur City Centre (KLCC) have been conducted by a few researchers. However, these studies were mainly accomplished by means of comp...

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Main Authors:	Farhana Najwa Azman, Lotfy, Eslam Reda, Ashraf Amer Abbas, Zambri Harun
Format:	Article
Language:	English
Published:	Penerbit Universiti Kebangsaan Malaysia 2018
Online Access:	http://journalarticle.ukm.my/12630/ http://journalarticle.ukm.my/12630/ http://journalarticle.ukm.my/12630/1/6.pdf

id	ukm-12630
recordtype	eprints
spelling	ukm-126302019-03-12T10:27:29Z http://journalarticle.ukm.my/12630/ Flow structure in modern cities: wind tunnel investigation Farhana Najwa Azman, Lotfy, Eslam Reda Ashraf Amer Abbas, Zambri Harun, Natural ventilation dominates the heat dissipation and pollutant dispersion in modern cities. Investigations into the flow structure and urban heat island in the Kuala Lumpur City Centre (KLCC) have been conducted by a few researchers. However, these studies were mainly accomplished by means of computational fluid dynamics. The critical problem with computational analysis is the lack of verification. As such, in this research, experimental tools such as the wind tunnel, hotwire anemometry, Pitot tube, and pressure and temperature sensors were utilized. The aim was to assess the ventilation performance of different city models with a height-to-width ratio that was similar to that of the KLCC. Several steps had to be performed before starting the study, among these being the building of the model. A 6×6 array of uniform acrylic blocks (50×50×100 mm) were arranged in line at equal distances. Three arrangements, representing different building densities (35, 25 and 15 %), were examined in the current research. The freestream wind speed was fixed at 5 m/s. The flow was found to be comprised of vortical structures, and attained an energetic turbulence in the downstream of the building areas as compared to the free flow areas. This study suggests keeping the plane area ratio in high-rise building cities within a 15-25% range. The study is beneficial to town planners as the construction of more skyscrapers is being planned. Penerbit Universiti Kebangsaan Malaysia 2018 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/12630/1/6.pdf Farhana Najwa Azman, and Lotfy, Eslam Reda and Ashraf Amer Abbas, and Zambri Harun, (2018) Flow structure in modern cities: wind tunnel investigation. Jurnal Kejuruteraan, 30 (1). pp. 39-46. ISSN 0128-0198 http://www.ukm.my/jkukm/volume-301-2018/
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
language	English
description	Natural ventilation dominates the heat dissipation and pollutant dispersion in modern cities. Investigations into the flow structure and urban heat island in the Kuala Lumpur City Centre (KLCC) have been conducted by a few researchers. However, these studies were mainly accomplished by means of computational fluid dynamics. The critical problem with computational analysis is the lack of verification. As such, in this research, experimental tools such as the wind tunnel, hotwire anemometry, Pitot tube, and pressure and temperature sensors were utilized. The aim was to assess the ventilation performance of different city models with a height-to-width ratio that was similar to that of the KLCC. Several steps had to be performed before starting the study, among these being the building of the model. A 6×6 array of uniform acrylic blocks (50×50×100 mm) were arranged in line at equal distances. Three arrangements, representing different building densities (35, 25 and 15 %), were examined in the current research. The freestream wind speed was fixed at 5 m/s. The flow was found to be comprised of vortical structures, and attained an energetic turbulence in the downstream of the building areas as compared to the free flow areas. This study suggests keeping the plane area ratio in high-rise building cities within a 15-25% range. The study is beneficial to town planners as the construction of more skyscrapers is being planned.
format	Article
author	Farhana Najwa Azman, Lotfy, Eslam Reda Ashraf Amer Abbas, Zambri Harun,
spellingShingle	Farhana Najwa Azman, Lotfy, Eslam Reda Ashraf Amer Abbas, Zambri Harun, Flow structure in modern cities: wind tunnel investigation
author_facet	Farhana Najwa Azman, Lotfy, Eslam Reda Ashraf Amer Abbas, Zambri Harun,
author_sort	Farhana Najwa Azman,
title	Flow structure in modern cities: wind tunnel investigation
title_short	Flow structure in modern cities: wind tunnel investigation
title_full	Flow structure in modern cities: wind tunnel investigation
title_fullStr	Flow structure in modern cities: wind tunnel investigation
title_full_unstemmed	Flow structure in modern cities: wind tunnel investigation
title_sort	flow structure in modern cities: wind tunnel investigation
publisher	Penerbit Universiti Kebangsaan Malaysia
publishDate	2018
url	http://journalarticle.ukm.my/12630/ http://journalarticle.ukm.my/12630/ http://journalarticle.ukm.my/12630/1/6.pdf
first_indexed	2023-09-18T20:03:02Z
last_indexed	2023-09-18T20:03:02Z
_version_	1777406975918735360

Flow structure in modern cities: wind tunnel investigation

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