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Numerical Investigations of Aerodynamic Force on Rectangular Cylinders in Oscillating Approaching Flow
|關鍵字:||Numerical simulation;數值模擬;Oscillating approaching flow;Rectangular cylinder;Morison equation;振盪來流;矩柱;莫瑞森方程式||出版社:||土木工程學系所||引用:|| Basara ,B. and Younis ,B .A . (1992) ,“Progreaa in the Prediction of Turbulent Wind Loading on Buildings ,” J. Wind Engg. And Ind. Aerod., Vol.41-44, pp.2863-2874.  Bearman, P. W. and Truman, D. M. (1972), “ An Investigation of the Flow Around Rectangular Cylinder ,” Aero. Quartely, Vol.23, pp.229-237.  Bearman P.W., Graham J.M.R., Obasaju E.D. and Drossopoulos G.M., “The influence of corner radius on the forces experienced by cylindrical bluff bodies in oscillatory flow”, Applied Ocean Research, 6(1984), 83-89.  Bearman, P. W., Downie, M. J., Graham, J. M. R., Obasaju, E. D. (1985)“Forces on cylinders in viscous oscillatory flow at low Keulegan-Carpenter number” J. Fluid Mech., Vol.154, pp.337-356  Cherry, N. J. ,Hillier, R. and Latour, M. E. P. (1984), “Unsteady Measurements in a Separated and Reattaching Flow ,” J. Fluid Mech., Vol.144, pp.13-46.  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Takashi, N., Suzuki, Y., Uemura, M. and Kobayashi, N.(2003) “Aerodynamic force on a square cylinder in oscillating flow with mean velocity” J. Wind Engg. And Ind. Aerod., Vol.91, pp.199-208  Williamson, C. H. K. (1985) “Sinusoidal flow relative to circular cylinders” J. Fluid Mech., Vol.155, pp.141-174  Williamson, C. H. K. and Roshko, A. (1988) “Vortex formation in the wake of oscillating cylinder” J. Fluid Mech., Vol.2, pp.355-381  Zheng, W. and Dalton, C. (1999) ”Numerical prediction of force on rectangular cylinders in oscillating viscous flow” J. Fluid Mech., Vol.13, pp.225-249  蔡惠文 (1996) “均勻來流中二維矩柱之流場模擬”中興大學土木研究所碩士論文||摘要:||
本研究以數值計算方法，模擬二維矩柱在平均流速不為零之週期性振盪來流下之矩柱受力行為。在高雷諾數的情況下，改變週期性振盪來流之速度振幅比(AR)自0.1至0.7、庫立根卡本特數 (KC) 自0.5至16，以及矩柱深寬比(B/D)由1至4，目的在探討改變之參數對二維矩柱受力行為之影響。
The unsteady forces on rectangular cylinders selected aspect ratios in oscillating flows at a zero attack angle with non-zero mean velocities were investigated numerically in a two-dimensional sense. At a high Reynolds number, the major parameters of the flow around a cylinder with a sinusoidal motion were the amplitude ratio of the approaching-flow velocity (AR) and the Keulegan-Carpenter number (KC), which varied respectively from 0.1 to 0.7 and 0.5 to 16. The resulting time-series wind loads on the cylinder for various AR and KC values were analyzed systematically to examine the flow effect of the rectangular cylinders.
To predict the unsteady turbulent flow around the rectangular cylinders, a weakly-compressible-flow method together with a subgrid-scale turbulence model was adopted. The resulting wind load histories were compared with the Morison equation to further find out the the corresponding values of Cd and Cd~ in the theoretical expressions based on a least-square estimation.
Results show that the numerical predictions are in good agreement with the available experimental results. Although Morison equation fails to correctly describe the time variation of lift in the case of a zero attack angle, it well describes the of the resulting drag histories in the oscillating approaching flow. Finally, the maximum drag is found when resonance occurs or when the period of the oscillating approaching flow equals the shedding period of the cylinders.
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