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 -------------------------------------------- 1
1.1 前言 ----------------------------------------------- 1
1.2 文獻回顧 ------------------------------------------- 2
1.3研究動機與預期目標-------------------------------- 6
第二章 理論分析 ----------------------------------- 7
2.1 模型建立 -------------------------------------------- 7
2.2 基本假設 -------------------------------------------- 7
2.3 統御方程式與邊界條件 -------------------------------- 8
2.4 模擬方向與參數設定----------------------------------- 9
2.5 格點獨立驗證與數值模擬正確性----------------------- 13
第三章 計算分析 ----------------------------------------- 15
3.1 商用軟體簡介 ---------------------------------------- 15
3.2 數值方法 -------------------------------------------- 16
第四章 數值模擬結果------------------------------------- 20
4.1 圓柱在均勻流場的尾流控制-----------------------------20
4.1.1圓柱上注入/吸出動量對CD、CL的影響----------------- 20
4.1.2圓柱開口角度對CD、CL的影響------------------------- 22
4.1.3週期性動量注入/吸出-------------------------------- 23
4.2 圓柱在剪切流場的不穩定--------------------------------25
4.2.1 shear flow 的斜率與CD、CL的影響---------------------25
4.2.2 圓柱受剪流場影響之運動軌跡-------------------------26
第五章 結論與建議-----------------------------------------30
5.1 結論--------------------------------------------------30
5.2 建議--------------------------------------------------32
參考文獻 -------------------------------------------------33
附錄 ---------------------------------------------------- 79

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