本文選題：四立柱　切入點(diǎn)：渦激運(yùn)動(dòng)　出處：《江蘇科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：由于國(guó)際上海洋石油工業(yè)的不斷發(fā)展，海洋平臺(tái)立柱的渦激運(yùn)動(dòng)這一問題受到了人們的關(guān)注。本論文跟蹤了國(guó)內(nèi)外有關(guān)柱體渦激運(yùn)動(dòng)的最新研究方向，對(duì)本領(lǐng)域內(nèi)的研究方法和進(jìn)展進(jìn)行了綜述和分析。以海洋平臺(tái)四立柱為研究對(duì)象，介紹了渦激運(yùn)動(dòng)的有關(guān)理論、數(shù)值模擬方法和實(shí)驗(yàn)方法，對(duì)均勻流中四立柱的渦激運(yùn)動(dòng)進(jìn)行了數(shù)值模擬，探索了截面形式、來流方向和間距比對(duì)渦激運(yùn)動(dòng)的影響，分析了四立柱渦激運(yùn)動(dòng)的幅值響應(yīng)、頻譜特性、運(yùn)動(dòng)軌跡和渦脫模式。論文的具體工作和主要研究成果如下： 1.較為全面的回顧和分析了國(guó)內(nèi)外研究柱體渦激運(yùn)動(dòng)問題的動(dòng)態(tài)和進(jìn)展，系統(tǒng)介紹了渦激運(yùn)動(dòng)問題研究過程中所涉及的流體相關(guān)參數(shù)、結(jié)構(gòu)物相關(guān)參數(shù)和耦合運(yùn)動(dòng)的相關(guān)參數(shù)。 2.采用動(dòng)網(wǎng)格技術(shù)實(shí)現(xiàn)柱體在流場(chǎng)中的運(yùn)動(dòng)，開發(fā)FLUENT軟件與結(jié)構(gòu)運(yùn)動(dòng)特性之間的接口程序，實(shí)現(xiàn)流體信息和結(jié)構(gòu)信息實(shí)時(shí)傳遞，并通過單柱體渦激運(yùn)動(dòng)數(shù)值模擬對(duì)接口程序進(jìn)行驗(yàn)證。 3.在不同的折合速度下，對(duì)方形四立柱和圓形四立柱渦激運(yùn)動(dòng)特性進(jìn)行對(duì)比研究。圓形四立柱的流向最大位移比方形四立柱小，但是橫向最大位移是方形四立柱的3倍多。圓形四立柱渦激運(yùn)動(dòng)出現(xiàn)了頻率鎖定現(xiàn)象，而方形四立柱則沒有。方形四立柱尾渦脫落模式總體呈現(xiàn)出2P模式，圓形四立柱尾渦脫落在折合速度較低時(shí)呈現(xiàn)P+S模式，高折合速度下為2S模式。 4.建立不同來流方向下方形四立柱渦激運(yùn)動(dòng)的模型，模擬0度、15度、30度和45度來流下方形四立柱渦激運(yùn)動(dòng)。來流方向?qū)u激運(yùn)動(dòng)特性有著很大的影響，0度來流所對(duì)應(yīng)的橫向振幅和流向振幅都是最小的，流向幅值在來流方向15度下達(dá)到最大值1.60D，，橫向幅值在來流方向30度下達(dá)到最大值1.22D。由于柱體之間的相互干擾作用，運(yùn)動(dòng)軌跡和尾渦脫落模式都比較凌亂。 5.建立不同間距比下方形四立柱渦激運(yùn)動(dòng)的模型，模擬間距比3.0、4.0和5.0工況下方形四立柱渦激運(yùn)動(dòng)。間距比3.0、4.0和5.0工況下，流向和橫向振幅隨折合速度的增大先增大到一定的數(shù)值，然后在其值左右振蕩。流向幅值在間距比5.0工況下達(dá)到最大值0.39D，橫向幅值在間距比3.0下達(dá)到最大值1.22D。流向平衡位置遠(yuǎn)離初始位置的距離和升力系數(shù)的主頻率均隨著折合速度的增大而增大。
[Abstract]:Due to the continuous development of offshore oil industry, people pay close attention to the vortex-induced motion of offshore platform columns. In this paper, the latest research directions of column vortex-induced motion at home and abroad are followed. The research methods and progress in this field are summarized and analyzed. Taking the four columns of offshore platform as the research object, the theory, numerical simulation and experimental methods of vortex-induced motion are introduced. The vortex-induced motion of four columns in a uniform flow is simulated numerically. The effects of cross-section, direction and distance ratio of incoming flow on the vortex-induced motion are explored. The amplitude response and spectral characteristics of the vortex-induced motion of four columns are analyzed. Motion trajectory and vortex detach model. The specific work and main results of this paper are as follows:. 1. The dynamics and progress of the research on vortex-induced motion of cylinders at home and abroad are reviewed and analyzed. The fluid related parameters, structural parameters and coupled motion parameters are systematically introduced. 2. The moving grid technology is used to realize the motion of the cylinder in the flow field, and the interface program between the FLUENT software and the structure motion characteristic is developed to realize the real-time transmission of the fluid information and the structure information. The interface program is verified by numerical simulation of vortex-induced motion of a single cylinder. 3. The vortex-induced motion characteristics of square four columns and circular four columns are compared at different folding speeds. The maximum displacement of circular four columns is smaller than that of square four columns. However, the maximum lateral displacement is more than three times that of the square four columns. The circular four columns exhibit frequency locking phenomenon, while the square four columns do not. The trailing vortex shedding mode of the square four columns generally shows a 2P mode. The wake shedding of circular four columns shows P S mode when the folding velocity is low, and 2S mode at high folding speed. 4. The vortex-induced motion model of four square columns in different directions is established. The vortex-induced motion of the square four columns is simulated at 0 ~ 15 degrees, 30 ~ 30 and 45 degrees. The direction of flow has a great influence on the characteristics of vortex-induced motion. The lateral amplitude and the flow direction amplitude of the zero degree flow are the smallest. The amplitude of flow direction reaches the maximum value of 1.60D at 15 degrees in the direction of incoming flow and the maximum value of 1.22D at 30 degrees in the direction of incoming flow. Due to the interaction between cylinders, the motion path and the pattern of wake vortex shedding are relatively messy. 5. The vortex-induced motion model of square four columns with different spacing ratios is established. The simulation results show that the vortex-induced motion of square four-column is simulated under the conditions of 3.0 ~ 4.0 and 5.0 respectively, and the distance ratio is 3.0 ~ 4.0 and 5.0, respectively. The flow direction and the transverse amplitude increase to a certain value with the increase of the folding velocity. The amplitude of flow direction reaches the maximum of 0.39D at the condition of spacing ratio 5.0, and the amplitude of transverse amplitude reaches the maximum value of 1.22D when the distance ratio is 3.0. The distance between the equilibrium position of the flow direction and the initial position and the main frequency of the lift coefficient are with each other. The speed of folding increases.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U661.1;U674.381

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本文編號(hào)：1590252