Universiti Teknologi Malaysia Institutional Repository

Investigation of surface roughness impact on mean wind flow using RNG k-e model

Zaki, S. A. and Jaafar, A. Z. and Mohammad, A. F. and Ali, M. S. M. and Abd. Razak, A. (2016) Investigation of surface roughness impact on mean wind flow using RNG k-e model. Jurnal Teknologi, 78 (9). pp. 21-28. ISSN 0127-9696

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Abstract

Wind flow in the urban boundary layer is influenced by both large-and small-scale surface roughness. In this study, Reynolds-averaged Navier-Stokes simulations using the renormalisation group (RNG) k-ε model were performed to study the wind flow in square arrays with small-scale roughness elements at the front and back of cubical obstacles at packing densities of 25.0% and 30.9%. The presence of small-scale roughness reduces streamwise velocity but increases turbulent kinetic energy. Moreover, small vortices are formed within the canopy because of small-scale roughness. The generated streamwise velocity profiles are similar at packing densities of 25.0% and 30.9%, but the drag coefficient is higher in the latter case. In brief, the impact of small-scale roughness on urban wind flow is considerable. The results of this study can contribute to future research on wind flow, particularly in the urban environment.

Item Type:Article
Uncontrolled Keywords:Packing density, Renormalisation group k-ε model
Subjects:T Technology > T Technology (General)
Divisions:Malaysia-Japan International Institute of Technology
ID Code:71684
Deposited By: Widya Wahid
Deposited On:15 Nov 2017 04:20
Last Modified:15 Nov 2017 04:20

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