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Title: Numerical simulations on wind-induced aerodynamics for tall buildings with refuge floors
Authors: Chow, WK 
Li, J
Issue Date: 2010
Source: The 5th International Symposium on Computational Wind Engineering (CWE2010), Chapel Hill, North Carolina, USA, 23-27 May 2010 How to cite?
Abstract: All new tall buildings exceeding 25 storeys must have refuge floors as specified in the fire safety codes in Hong Kong. At least two opposite external walls must be provided for adequate cross ventilation at the refuge floor. Although fire resisting walls are required, openings are allowed if protected by water curtain drencher systems. Consequently, there are many tall buildings with open refuge floors.
Wind action on tall buildings with open refuge floors might give a background air flow pattern very different from that with enclosed refuge floors. Such design would affect natural ventilation provisions to surrounding buildings. This architectural feature on open refuge floor is important in assessing air ventilation required in town planning. In addition, performance on smoke control systems would be affected. Effect of smoke dis-charged out from the fire source to adjacent buildings is another concern.
Wind-induced aerodynamics in tall buildings with and without open refuge floors will be studied with Computational Fluid Dynamics (CFD) in this paper. Software based on two-equation turbulence models derived from Reynolds averaging will be applied. A geometry with a lower building of height over 80 m and an adjacent taller building of 150 m is taken as an example. Air flow patterns induced by wind in its surrounding were simulated through incident wind velocity profile. Predicted pressure distributions around these two buildings are then applied for a ssessing natural ventilation provision; and evaluating the performance of static smoke exhaust systems.
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