摘 要
本論文跟蹤了國內外有關圓柱體及海洋立管渦激振動問題的最新研究動向，對本領域內的研究方法和進展進行了綜述和分析。以深海立管為研究對象，介紹了渦激振動的有關理論、數(shù)值模擬方法和實驗方法，對均勻流中圓柱體的渦激振動進行數(shù)值模擬，探索了動波壁方法對圓柱體渦激振動的抑制作用，對深海柔性立管在不同均勻來流速度下的橫向位移響應進行了時域計算，分析了立管的模態(tài)激發(fā)過程，并將動波壁方法應用于柔性立管的渦激振動抑制研究工作。論文的具體工作和主要研究成果如下：
1) 較為全面地回顧和分析了國內外研究海洋立管渦激振動問題的動態(tài)和進展，系統(tǒng)介紹了渦激振動問題研究過程中所涉及的流體相關參數(shù)、結構物相關參數(shù)和耦合運動相關參數(shù)等；
2) 針對平面內兩自由度彈性支撐圓柱體的渦激振動建立了圓柱體的力學模型，介紹了流場的數(shù)值求解方法和圓柱體的動力響應求解方法等，并對圓柱體與流場的耦合求解過程用流程圖進行了描述。
3) 采用動波壁技術對圓柱體的渦激振動進行抑制效果研究，發(fā)現(xiàn)圓柱尾渦的發(fā)放與壁面波動方向相關，圓柱渦激振動位移響應受壁面波動頻率影響，雷諾數(shù)固定不同約化速度彈性支撐圓柱的橫向位移在適當?shù)谋诿娌▌宇l率下均能降低到0.05D以下，渦激振動抑制效果顯著，壁面波動能夠消除圓柱尾部流場的渦街，并使流場內渦量影響區(qū)域集中在縱向對稱線附近較窄區(qū)域。
4) 詳細介紹了海洋立管時域內動力響應的有限元方法并對 方法編制了C語言程序，對其計算的精確性采用算例進行了驗證。
5) 采用切片法對海洋立管因渦激振動而產(chǎn)生的柔性變形進行數(shù)值計算，分析了立管在均勻來流下的模態(tài)演化過程，考察了通過表面覆蓋動波壁的方法控制細長立管的渦激振動，發(fā)現(xiàn)動波壁的設置能夠極大限度地降低立管的橫向位移響應，動波壁的覆蓋率和覆蓋方式對立管的橫向位移響應產(chǎn)生明顯影響。
關鍵詞：切片法；動波壁；渦激振動；柔性立管


Abstract
In this paper, the state of the art of study on the vortex-induced vibration of pipe riser is summarized. Research methods and progress used in VIV analysis are introduced. Empirical theory total with numerical simulation methods and experimental methods about VIV is introduced in this paper. Vortex-induced vibration phenomenon of cylinder which is placed in a uniform flow is simulated by software FLUENT, explorative study about the inhibitory effect of VIV for the use of wavy wall on the right half surface of cylinder which is free in XY plane is made, transverse displacement response of deep-sea flexible pipe riser with different in-flow speed is calculated in time domain, the modal stimulation process of pipe riser is analyzed, and wavy wall is used on deep-sea flexible pipe riser to suppress the VIV. The main work and important conclusions of this paper are listed as follows:
1) A comprehensive review and analysis about the advance of VIV research at home and abroad is performed. Correlation parameters of fluid, structure and coupling movement of fluid and structure involved in the study of VIV are systematically introduced.
2) Mechanical modal of cylinder which is elastic supported within XY plane and free in X and Y directions is established. Methods used to calculate flow field and the dynamic response are introduced. Coupling process of VIV of the cylinder is described by flowcharts.
3) Study about the inhibitory effect of VIV for the use of wavy wall on the right half surface of cylinder, it’s found that tail vortex of cylinder is related with the wall fluctuated direction, the displacement response of cylinder is influenced by the frequency of wall fluctuation, and it can be reduced down to 0.05D for cylinder with different reduced velocities, the wavy wall could be used to eliminate vortex in tail flow field, and vortex amassed in the narrow area that near symmetry line of X direction flow field.
4) The finite element method used for the solution of dynamic response of deep-sea pipe riser is introduced. A code for method is programed using C language and is verified the calculation accuracy by numerical example.
5) The flexible deformation of pipe riser caused by VIV is simulated with the method of strip technique. The process of modal evolution of pipe riser in the uniform current is analyzed . The results show that transverse displacement response of riser with wavy wall is greatly minimized and the coverage rate and arrangement of wavy wall have a great influence on the displacement response of riser.
Key word: strip technique; wavy wall cylinder; VIV; flexible riser


目 錄
摘要 I
ABSTRACT II
第1章 緒論 1
1.1 研究背景及意義 1
1.2 海洋立管渦激振動研究現(xiàn)狀 1
1.2.1 渦激振動的概念 1
1.2.2 渦激振動研究現(xiàn)狀 2
1.3 渦激振動抑制方法研究現(xiàn)狀 6
1.4 論文的主要工作及創(chuàng)新點 8
1.4.1 論文的主要工作 8
1.4.2 論文的主要創(chuàng)新點 9
第2章 渦激振動基本知識 10
2.1 旋渦的形成與發(fā)放機理 10
2.2 渦激振動相關參數(shù) 11
2.2.1 流體相關基本參數(shù) 12
2.2.2 結構物相關參數(shù) 14
2.2.3 其他重要參數(shù) 15
2.3 本章小結 16
第3章 二維彈性支撐圓柱渦激振動數(shù)值計算方法 17
3.1 圓柱體力學模型的建立 17
3.2 流場數(shù)值求解 18
3.3 動力學方程的求解 19
3.4 計算流程 20
3.5 本章小結 20
第4章 主動控制措施對圓柱渦激振動的作用 22
4.1 數(shù)值計算模型 22
4.1.1 計算流體力學控制方程 22
4.1.2 結構動力學..