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標題: 應用不同方法探討方柱形建築鄰近紊流風場之數值模擬研究
Simulation of Turbulent Flows Around a Building with a Square Cross-section by Using Different Numerical Methods
作者: 邱凱斌
Chiu, Kai-Bin
關鍵字: 數值模擬;Numerical Simulation;紊流模型;方形建築;Turbulence Model;Square Building
出版社: 土木工程學系所
引用: [1]American National Standard A58.1-1982 Minimun American National Standard Institute,Inc., New York. [2]Bert Blocken, Ted Stathopoulos, Jan Carmeliet (2007), “CFD simulation of the atmospheric boundary layer: wall function problems” [3]Courant, R., Friedrichs, K.O. and Lewy, H. (1967), “On the partial difference equations of mathematical physics,” IBM Journal, pp. 215-234. [4]James W. Deardorff (1970), “A numerical study of three-dimensional turbulent channel flow at large Reynolds numbers,” Journal of Fluid Mechanics, Volume 41, pp. 453-480. [5] Fang, F.M. (2006), “Some CFD applications in bluff-body aerodynamics,” Proceedings of Symposium on Future Development for Environment Restoration and Disaster Reduction Technologies, pp.79-84, Taichung, Taiwan. [6]Fang, F.M., Li, Y.C. and Liang, T.C. (2003), “CWE development inTaiwan,” Proceedings of 2003 International Wind Engineering Symposium: 107-122, Tansui, Taiwan. [7] Gartshore, I.S. (1984), "Some Effects of Upstream Turbulence on the Unsteady Lift Forces Imposed on Prismatic Two Dimensional Bodies," Transactions of the ASME, pp.418-424. [8] Germano, U., Piomelli, P. and Cabot, W.H. (1991), “A dynamic subgrid-scale eddy viscosity model, Physics of Fluids,” Vol.3, pp. 1760-1765. [9] Gomes, M.G., Rodrigues, A.M. and Mendes, P. (2005), ”Experimental and numerical study of wind pressures on irregular-plan shapes” Journal of Wind Engineering and Industrial Aerodynamics,” Vol.93, pp.741-756. [10]Kondo, K., Murakami, S. and Mochida, A. (1997), “Generation of velocity fluctuations for inflow boundary condition of LES,” Journal of Wind Engineering and Industrial Aerodynamics, Vol.67/68, pp. 51-64. [11]Lee, B.E. (1979), “The effect of end plates on the mean force on square sectioned cylinders” Journal of Wind Engineering and Industrial Aerodynamics, pp.262-282 [12]MacCormack, R. (1969), “The effect of viscosity in hyper-velocity impact cratering,” AIAA paper, pp. 69-354. [13]Murakami, S. and Mochida, A. (1995), “On turbulent vortex shedding flow past 2D square cylinder predicted by CFD,” Journal of Wind Engineering and Industrial Aerodynamics, Vol.54, pp.191-211. [14]Murakami, S., Mochida, A., Hayashi, Y. and Sakamoto, S. (1992), “Numerical study on velocity-pressure filed and wind forces for bluff bodies by k-ε, ASM and LES,” Journal of Wind Engineering and Industrial Aerodynamics, Vol.41-44, pp. 2841-2852. [15]Song, C.C.S. and Yuan, M. (1988), “A weakly compressible flow model and rapid convergence methods,” Journal of Fluids Engineering, Transactions ASME, Vol.110, pp.441-455. [16]Smagorinsky, J. (1963), “General circulation experiments with primitive equations,” Month Weather Review, Vol. 91, pp. 99-164, Cincinnati, Ohio. [17]Tetsuro Tamura, Kojiro Nozawa, Koji Kondo (2008), “AIJ guide for numerical prediction of wind loads on building.” Journal of Wind Engineering and Industrial Aerodynamics, Vol.96, pp.1974-1984. [18]Vickery, B. J.(1966), "Fluctuating lift and drag on a long cylinder of square cross-section in a smooth and in a turbulent stream," Journal of Fluid Mechanics,Vol.25, pp.418-424 [19]內政部建築研究所(2006)〈建築物耐風設計規範及解說〉,營建雜誌社編印,台灣。 [20]陳宥芸(2004),“邊界層流中高層建築風力特性之數值模擬”,淡江大學土木工程研究所碩士論文,台北。 [21]方富民、陳若華、陳鉅昌、林金賢(2009),“建築結構所受風力之數值模擬與風洞實驗比較驗證研究”,內政部建築研究所委託研究報告。 [22]蔡惠文(1996),“均勻來流中二維矩柱之流場模擬”,國立中興大學土木工程研究所碩士論文,台中。
近年隨著計算機軟硬體的長足進步,藉其高速運算與大量數據處理能力,使用計算流體力學方法(computational fluid dynamics; CFD)分析風場並配合風洞試驗已成為國際風工程領域研究的重要工具。
本研究針對大氣邊界層中平坦空曠地形上高寬比4獨立方形建築物為基準問題,以文獻中風洞建築模型試驗量測資料,作為數值模擬來流及試驗結果驗證的基本依據。數值模擬分別採用自行發展的微可壓縮流法(weakly-compressible-flow;WCF)及商用套裝軟體FLUENT,使用空間平均(space average)的大渦模擬(large-eddy-simulation;LES)紊流模型模擬建築物鄰近之非恆定(unsteady)紊流風場,並比較兩個數值軟體在操作上之優缺點與風場模擬結果之差異性,繼而評估其實用性和可行性。

Due to significant advancement of computer hardware and software, by taking advantage of the high-speed computation and data treatment capability of computers, computational fluid mechanics has become an important tool world-widely in analyzing flow problems besides wind tunnel experiments,
In the study, the flow around an isolated square building in an open and flat territory, with an aspect ratio of 4, is selected as the bench-mark problem. Wind tunnel measurement are performed beforehand and the results are used as the basis to verify the validity of the predicted results by numerical simulations. On the other hand, two software are employed for the flow simulations. One is based on a weakly-compressible-flow method; the other is FLUENT, a commercial CFD software. In both the numerical computations, a space-averaged large eddy simulation is used to predict the resulting unsteady, turbulent surrounding flows. The accuracy of the predicted results as well as the convenience of handling the numerical calculations by both softwares will be assessed.
其他識別: U0005-0108201321471900
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