# 臺灣博碩士論文加值系統

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 本文主要是以數值模擬方法探討在流場形式不同下對圓柱的影響，並從渦漩剝離與流體彈性不穩定兩方面來做分析。首先在渦漩剝離方面，改變圓柱開口角度與動量干擾形式，觀察對圓柱後尾流渦漩的影響，並藉由商用軟體STAR-CD之便，取出升力係數與阻力係數值；另一方面，模擬單一圓柱在剪流場中，計算整理得出不同shear parameter與雷諾數下阻力係數與升力係數的資料庫，將其用來估計圓柱在不同位置上所受的力，並且分析出圓柱在流體彈性不穩定之因素影響下，剪流場的shear parameter，與當時mass ratio和damping factor分別對圓柱的擺盪振幅與運動軌跡的關係。
 In the study, we confer with the effect of the circular cylinder for various flow fields, and investigate the phenomenon of the vortex shedding and fluid elastic instabilities. First, in the aspect of the vortex shedding, we observe the wake behind the cylinder after varying the locations of orifices on the cylinder and the forms of momentum addition, and the variation of the lift and drag coefficient can be obtained by using the commercial software STAR-CD. In the further study, we make the type of flow field to be a shear flow and build the database of the aerodynamic coefficients in different shear parameter and Reynolds numbers; furthermore, the database is an important basis for us to conjecture the surface force on the cylinder, and analyze the size of oscillations and the orbit that is caused by the shear parameter, mass ratio and damping factor respectively.
 論文摘要(中文) -------------------------------------- Ⅰ論文摘要(英文) -------------------------------------- Ⅱ目錄 --------------------------------------------------- Ⅲ表目錄 -------------------------------------------------- Ⅴ圖目錄 -------------------------------------------------- Ⅵ符號說明 ------------------------------------------------ Ⅸ第一章 緒論 -------------------------------------------- 11.1 前言 ----------------------------------------------- 11.2 文獻回顧 ------------------------------------------- 21.3研究動機與預期目標-------------------------------- 6第二章 理論分析 ----------------------------------- 72.1 模型建立 -------------------------------------------- 72.2 基本假設 -------------------------------------------- 72.3 統御方程式與邊界條件 -------------------------------- 82.4 模擬方向與參數設定----------------------------------- 92.5 格點獨立驗證與數值模擬正確性----------------------- 13第三章 計算分析 ----------------------------------------- 153.1 商用軟體簡介 ---------------------------------------- 153.2 數值方法 -------------------------------------------- 16第四章 數值模擬結果------------------------------------- 204.1 圓柱在均勻流場的尾流控制-----------------------------204.1.1圓柱上注入/吸出動量對CD、CL的影響----------------- 204.1.2圓柱開口角度對CD、CL的影響------------------------- 224.1.3週期性動量注入/吸出-------------------------------- 234.2 圓柱在剪切流場的不穩定--------------------------------254.2.1 shear flow 的斜率與CD、CL的影響---------------------254.2.2 圓柱受剪流場影響之運動軌跡-------------------------26第五章 結論與建議-----------------------------------------305.1 結論--------------------------------------------------305.2 建議--------------------------------------------------32參考文獻 -------------------------------------------------33附錄 ---------------------------------------------------- 79
 1.Blevins., 1990, “Flow-Induce Vibration”, second edtion, VAN NOSTRAND REINHOLD.2.Bruce R. Munson, Donald F. Young and Theodore H. Okiishi,1998,” Fundamentals of Fluid Mechanics ”, Third Edition, John Wiley & Sons.3.Cimbala,J.M. and Park,W.J., 1990, “Experimental Investigation of the Turbulent Structure in the Wake of a Two-Dimensional Airfoil,” Journal of Fluid Mechanics, Vol.213, pp.479-509.4.C. Lei, L. Cheng, K. Kavanagh, 2000, “A finite difference solution of the shear flow over a circular cylinder,” Ocean Engineering 27, pp.271–2905.E. Guilmineau and P. Queutey, 2002, “ A Numerical Simulation Of Vortex Shedding From An Oscilating Circular Cylinder,” Journal of Fluids and Structures16(6) ,pp. 773–7946.Gunzburger,M.D. and Lee,H.C., 1996, “Feedback Control of Karman Vortex Shedding, ” , Journal of applied mechanics, Transactions of the ASME, Vol.63, pp.828-835.7.Lienhard,J.H., 1966 “Synopsis of Lift, Drag and Vortex Frequency Data for Rigid Circular Cylinders,” Washington State University, College of Engineering, Research Division Bulletin pp.300.8.Modi,V.J., Dobric,A. and Yokomizo,T., 1993, “Effect of Momentum Injection on the Fluid Dynamics of Bluff Bodies,” Proceedings of the Third (1993) International Offshore and Polar Engineering Conference, Part 3 (of 4) Jun 6-11, 1993 Singapore, pp.501-513.9.Munshi,S.R., Modi,V.J. and Yokomizo,T., 1996, “Effect of Momentum Injection on the Drag Reduction and Flow-Induced Instabilities of a Square Prism,” International Journal of Offshore and Polar Engineering, Vol.6, No.3, pp.161-170.10.Sahjendra N. Singh, James H. Myatt, Gregory A. Addington, Siva Banda, and James K. Hall, 2001, “Optimal Feedback Control of Vortex Shedding Using Proper Orthogonal Decomposition Models,” Journal of Fluids Engineering, Transactions of the ASME, Vol.123, pp.612-618.11.Tae soon Kwon, Hyung Jin Sung and Jae Min Hyun, 1992, “Experimental Investigation of Uniform Shear Flow Past a Circular Cylinder,” Journal of fluid engineering12.Tang,S., 2000, “Suppression of Vortex Shedding Inspired by a Low-Dimensional Model,” Journal of Fluids and Structures, Vol.14, pp.443-468.13.Von Karman,T., 1912, “Uber den Mechanismuss des Windersstandes den ein bewegter Korper in einen Flussigkeit Erfahart,” Nachrichten der K. Gesellschaft der Wissenschaften zu Gottingen, pp.547-556.14.Yannick Delaunay and Lambros Kaiktisis, Control of Cylinder Wakes Using Base MassTranspiration, Physics of Fluids, Vol.13, pp.3285-3302, 2001
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 1 剪切流場中交錯排列圓柱之流體引致振動之模擬研究

 1 [16]. 高家俊、楊耀存、錢樺, “海氣象因子對離岸型風力機發電風能潛力評估之影響,”能源季刊, 第33卷, 第三期, 94~111頁, 2003年7月。 2 [6]. 陳文樹, “風中奇源，風力建置與海水淡化,” 能源報導, 22~24頁, 2004年7月。

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