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Numerical simulation of the effects of secondary roughness in the form of extension to arrays of terraced houses on pedestrian wind

The present study used large eddy simulations (LES) to examine the pedestrian wind velocity distribution for several cases of terraced houses with extensions. Two simulation cases of idealized terraced houses were performed with extension elements in square (E-SQ) and staggered (E-ST) arrangements....

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Main Authors: Salim, S., Razali, M. N. H. A., Ikegaya, N., Mohammad, A. F., Ali, M.
Format: Article
Published: Taylor and Francis Inc 2020
Subjects:
T Technology (General)
Online Access:http://eprints.utm.my/id/eprint/86747/
http://dx.doi.org/10.1080/23744731.2020.1735860
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spelling my.utm.867472020-09-30T09:05:18Z http://eprints.utm.my/id/eprint/86747/ Numerical simulation of the effects of secondary roughness in the form of extension to arrays of terraced houses on pedestrian wind Salim, S. Razali, M. N. H. A. Ikegaya, N. Mohammad, A. F. Ali, M. T Technology (General) The present study used large eddy simulations (LES) to examine the pedestrian wind velocity distribution for several cases of terraced houses with extensions. Two simulation cases of idealized terraced houses were performed with extension elements in square (E-SQ) and staggered (E-ST) arrangements. These extension elements were treated as secondary roughness. A simulation of the terraced houses without extension (NE) was also performed to provide a baseline comparison. The mean velocity distribution from LES showed that the secondary roughness strictly limited the flow penetration in both cases, which reduced the turbulent kinetic energy (TKE) inside the canyon. In comparison, E-ST had a stronger effect on TKE than E-SQ with a maximum difference of 19%. Downwind extension elements severely reduced the wind speed at the street and neighbors’ houses by about 40% to 50%. However, upwind extension elements increased the wind speed at neighbors’ houses about threefold compared to NE. The weak pedestrian wind speed at upwind houses was improved about twelve times with E-SQ and eight times with E-ST when neighbors extended their houses. This indicates that the secondary roughness significantly influences the wind distribution around buildings. Selecting the extension area is important for providing effective outdoor flow conditions. Taylor and Francis Inc 2020 Article PeerReviewed Salim, S. and Razali, M. N. H. A. and Ikegaya, N. and Mohammad, A. F. and Ali, M. (2020) Numerical simulation of the effects of secondary roughness in the form of extension to arrays of terraced houses on pedestrian wind. Science and Technology for the Built Environment, 26 (7). pp. 928-940. ISSN 2374-4731 http://dx.doi.org/10.1080/23744731.2020.1735860
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic T Technology (General)
spellingShingle T Technology (General)
Salim, S.
Razali, M. N. H. A.
Ikegaya, N.
Mohammad, A. F.
Ali, M.
Numerical simulation of the effects of secondary roughness in the form of extension to arrays of terraced houses on pedestrian wind
description The present study used large eddy simulations (LES) to examine the pedestrian wind velocity distribution for several cases of terraced houses with extensions. Two simulation cases of idealized terraced houses were performed with extension elements in square (E-SQ) and staggered (E-ST) arrangements. These extension elements were treated as secondary roughness. A simulation of the terraced houses without extension (NE) was also performed to provide a baseline comparison. The mean velocity distribution from LES showed that the secondary roughness strictly limited the flow penetration in both cases, which reduced the turbulent kinetic energy (TKE) inside the canyon. In comparison, E-ST had a stronger effect on TKE than E-SQ with a maximum difference of 19%. Downwind extension elements severely reduced the wind speed at the street and neighbors’ houses by about 40% to 50%. However, upwind extension elements increased the wind speed at neighbors’ houses about threefold compared to NE. The weak pedestrian wind speed at upwind houses was improved about twelve times with E-SQ and eight times with E-ST when neighbors extended their houses. This indicates that the secondary roughness significantly influences the wind distribution around buildings. Selecting the extension area is important for providing effective outdoor flow conditions.
format Article
author Salim, S.
Razali, M. N. H. A.
Ikegaya, N.
Mohammad, A. F.
Ali, M.
author_facet Salim, S.
Razali, M. N. H. A.
Ikegaya, N.
Mohammad, A. F.
Ali, M.
author_sort Salim, S.
title Numerical simulation of the effects of secondary roughness in the form of extension to arrays of terraced houses on pedestrian wind
title_short Numerical simulation of the effects of secondary roughness in the form of extension to arrays of terraced houses on pedestrian wind
title_full Numerical simulation of the effects of secondary roughness in the form of extension to arrays of terraced houses on pedestrian wind
title_fullStr Numerical simulation of the effects of secondary roughness in the form of extension to arrays of terraced houses on pedestrian wind
title_full_unstemmed Numerical simulation of the effects of secondary roughness in the form of extension to arrays of terraced houses on pedestrian wind
title_sort numerical simulation of the effects of secondary roughness in the form of extension to arrays of terraced houses on pedestrian wind
publisher Taylor and Francis Inc
publishDate 2020
url http://eprints.utm.my/id/eprint/86747/
http://dx.doi.org/10.1080/23744731.2020.1735860
_version_ 1680321089852407808
score 13.211869

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