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LES analysis of unsteady characteristics of conical vortex on a flat roof.pdf

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LES analysis of unsteady characteristics of conical vortex on a flat roof

ARTICLE IN PRESSJournal of Wind Engineering and Industrial Aerodynamics 96 (2008) 20076105/$ - doi:10.1016/j Correspo E-mail /locate/jweiaLES analysis of unsteady characteristics of conical vortex on a flat roof Y. Onoa,, T. Tamurab, H. Kataokaa aFluid Engineering Department, Technical Research Institute, Obayashi Corporation, 4-640 Simokiyoto, Kiyose, Tokyo, Japan bDepartment of Environmental Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Japan Available online 8 April 2008Abstract This paper discusses the unsteady characteristics of the conical vortex on a flat roof on the basis of numerical results by large eddy simulation (LES) when flow attacks oblique to the roof. There have been a number of researches regarding the pressure characteristics associated with the motion of the conical vortices. These kind of studies have been performed by wind tunnel experiments for many years. On the other hand, recent advancement of Computational Fluid Dynamic (CFD) has made it possible to easily simulate the flow characteristics around a building. So, it has been expected that CFD become a powerful tool to investigate the pressure characteristics of a building associated with the flow structure. However, the applicability of CFD to the flow around a flat roof has not reached complete understanding. First, the present LES model is validated for the prediction of the pressure characteristics on a roof for oblique flow-through comparison with the previous experimental data. Next, the unsteady motions of the conical vortex are investigated by use of a flow visualization technique. r 2008 Elsevier Ltd. All rights reserved. Keywords: LES; Conical vortex; Overset grid; Suction fluctuation; Oncoming turbulent flowsee front matter r 2008 Elsevier Ltd. All rights reserved. .jweia.2008.02.021 nding author. dress: ono.yoshiyuki@obayashi.co.jp (Y. Ono). ARTICLE IN PRESS Y. Ono et al. / J. Wind Eng. Ind. Aerodyn. 96 (2008) 2007–201820