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RISS 인기검색어
- 검색키워드
- 주제어 : building wake (검색결과 5 건)
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Numerical and wind tunnel simulation of pollutant dispersion in the near wake of buildings
Wang, X.,McNamara, K.F. Techno-Press 2005 Wind and Structures, An International Journal (WAS Vol.8 No.6
Numerical and wind tunnel simulations of pollutant dispersion around rectangular obstacles with five aspect ratios have been conducted in order to identify the effects of flow patterns induced by buildings on plume dispersion in the near wake of buildings. An emission from a low source located upwind of obstacles was used in this simulation. The local flow patterns and concentrations around a cubical obstacle were initially investigated using three RANS turbulence models, (the standard $k-{\varepsilon}$, Shear Stress Transport (SST), Reynolds-Stress RSM turbulence model) and also using Large-eddy simulation (LES). The computed concentrations were compared with those measured in the wind tunnel. Among the three turbulence models, the SST model offered the best performance and thus was used in further investigations. The results show, for normal aspect ratios of width to height, that concentrations in the near wake are appreciably affected because of plume capture by the horseshoe vortex and convection by the vertical vortex pairs. These effects are less important for high aspect ratios. Vertical vortex pairs present a strong ability to exchange mass vertically and acts efficiently to reduce ground-level concentrations in the near wake.
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초고층 건축물의 공력학적 설계에 의한 풍진동 저감 효과
홍성일(Hong Sung-Il),김무환(Kim Mu-Hwan),이옥진(Lee Ok-Jin),조강표(Cho Kang-Pyo) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
Modern tall buildings having multiplex functions are increasing in height for the powerful use of land by the development of construction skills, the progress of structural analysis techniques, the concentration of population, and industrial and economic development of modern society. Wind-induced vibration of tall buildings are mainly due to buffeting, vortex and wake. Also, wind-induced responses of buildings are different according to the geometry of buildings, structural characteristics such as stiffness, mass and damping, and turbulent characteristics of wind. In this paper, wind-tunnel experiments are performed using variables such as the plane and elevation shapes and aerodynamic apparatus of buildings. The square, equilateral triangular and circular sections were selected as plane shapes of buildings, and the setback and tapered types were tried for the circular section. Also, wind-induced responses were investigated for a total of nine models having equivalent effective slenderness ratios by attaching ribs and spirals to the circular model, the setback type model, and the tapered type model. From the results of the experiments, wind-induced response was the least for the circular section, and the wind-induced response for the setback type was much smaller than that of the tapered type. The ribs and spirals as aerodynamic apparatus had the similar damping effects in the cross-wind direction.
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Abdollah Baghaei Daemei,Seyed Rahman Eghbali 한국풍공학회 2019 Wind and Structures, An International Journal (WAS Vol.29 No.2
One of the most important factors in tall buildings design in urban spaces is wind. The present study aims to investigate the aerodynamic behavior in the square and triangular footprint forms through aerodynamic modifications including rounded corners, chamfered corners and recessed corners in order to reduce the length of tall buildings wake region. The method used was similar to wind tunnel numerical simulation conducted on 16 building models through Autodesk Flow Design 2014 software. The findings revealed that in order to design tall 50 story buildings with a height of about 150 meters, the model in triangular footprint with aerodynamic modification of chamfered corner facing wind direction came out to have the best aerodynamic behavior comparing the other models. In comparison to the related reference model (i.e., the triangular footprint with sharp corners and no aerodynamic modification), it could reduce the length of the wake region about 50% in general. Also, the model with square footprint and aerodynamic modification of chamfered corner with the corner facing the wind could present favorable aerodynamic behavior comparing the other models of the same cluster. In comparison to the related reference model (i.e., the square footprint with sharp corners and no aerodynamic modification), it could decrease the wake region up to 30% lengthwise.
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Modelling the dispersion of a tracer gas in the wake of an isolated low-rise building
Quinn, A.D.,Wilson, M.,Reynolds, A.M.,Couling, S.B.,Hoxey, R.P. Techno-Press 2001 Wind and Structures, An International Journal (WAS Vol.4 No.1
Mean concentrations of ammonia gas released as a tracer from an isolated low-rise building have been measured and predicted. Predictions were calculated using computational fluid dynamics (CFD) and two dispersion models: a diffusion model and a Lagrangian particle tracking technique. Explicit account was taken of the natural variation of wind direction by a technique based on the weighted summation of individual steady state wind direction results according to the probability density function of the wind direction. The results indicated that at distances >3 building heights downstream the weighted predictions from either model are satisfactory but that in the near wake the diffusion model is less successful. Weighted solutions give significantly improved predictions over unweighted results. Lack of plume spread is identified as the main cause of inaccuracies in predictions and this is linked to inadequate resolution of flow features and mixing in the CFD model. Further work on non-steady state simulation of wake flows for dispersion studies is recommended.
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