Paper Conference

Proceedings of ASim Conference 2014: 2nd Asia conference of IBPSA-China, Japan, Korea


Effect of upstream building arrangement and setback distance on air flow around idealized cubical building arrays

Azli Abd Razak, Tuan Liyana Tuan AB. Rashid, Rashid Hafriz Husam, Sheikh Ahmad Zaki Shaikh Salim, Ahmad Faiz Mohammad

Abstract: The modification of flow pattern and mean wind profile in a built-up area due to upstream buildings can be quiet significant on the breathability of an urban area. Due to this circumstance, this paper aims to numerically evaluate the effects of the upstream building configuration and the upstream distance on the upwind building area at pedestrian level respectively. The analysis and evaluation of the upstream effect over the idealized buildings arrays was performed using the Large Eddy simulation (LES) method with a fine grid of Δ=H/32. The air flow over staggered uniform cubical arrays was simulated under two different upstream arrangements, squared and staggered. Both the upstream building and upwind arrays were arranged with a plan area ratio of λp =25%. In addition, the distance between the upstream building and the upwind building was varied with a distance of 4H and 6H. By increasing this distance, the generated recirculation and isolated vortex will enhance the efficiency of the ventilation performance. Whereas, the staggered area shows that a wider passage width will influence the ventilation performance better than a squared pattern. This natural ventilation analysis is an important consideration for future urban development that may be needed by building physic engineers.
Keywords: Velocity profile, staggered arrays, square arrays, LES, setback distance
Pages: 802 - 808