Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16062
Title: Numerical studies on air flow around a cube
Authors: Gao, Y
Chow, WK 
Keywords: Flow separation and reattachment
Standard k - ε turbulence model
Turbulent kinetic energy
Upstream flow velocity
Issue Date: 2005
Publisher: Elsevier
Source: Journal of wind engineering and industrial aerodynamics, 2005, v. 93, no. 2, p. 115-135 How to cite?
Journal: Journal of wind engineering and industrial aerodynamics 
Abstract: In this paper, air approach flow moving towards a cube will be studied using computational fluid dynamics (CFD). The Reynolds Averaging of Navier-Stokes (RANS) equation types of k - ε turbulence model are used. Some RANS predicted results are compared with different upstream air speeds. Flow separation at the corner above the top of the cube, level of separation and reattachment are investigated. Reference is made to the experimental data on wind tunnels reported in the literature. A method similar to 'recirculation bubble promoter' is used for different approach flow speed distributions. Problems encountered in numerical simulations due to the sharp corner are discussed with a view to obtaining better prediction on recirculation flow in regions above the top of the cube. Correlations between the turbulent kinetic energy above the cube and the recirculation bubble size are derived for different distributions of approach flow speed. By limiting the longitu dinal velocities in the first cell adjacent to the sharp edge of the cube or rib, and making good use of the wall functions at the intersection cells of the velocity components, positions of maximum turbulent kinetic energy and the flow separation and reattachment can be predicted by a standard k - ε model. The results agree with those obtained in the experiments.
URI: http://hdl.handle.net/10397/16062
ISSN: 0167-6105
EISSN: 1872-8197
DOI: 10.1016/j.jweia.2004.11.001
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