【摘要】：畸形波是一種瞬時(shí)存在、波高巨大的災(zāi)害性波浪,對(duì)航海及海洋工程設(shè)備具有較大的破壞性。目前,畸形波的理論方程存在局限性,其生成機(jī)制、影響因素等還尚不明確。由于畸形波出現(xiàn)的概率較低,實(shí)測(cè)資料較少,其研究工作仍處于初始階段。有關(guān)畸形波與海洋浮式結(jié)構(gòu)物相互作用的研究則更少。本文基于CFD方法來(lái)研究畸形波及其與浮式結(jié)構(gòu)物的相互作用,主要研究?jī)?nèi)容和成果如下:(1)基于水動(dòng)力學(xué)理論和結(jié)構(gòu)動(dòng)力學(xué)理論,建立波浪與結(jié)構(gòu)物相互作用的流固耦合數(shù)學(xué)模型,包括不可壓縮的連續(xù)性方程與N-S方程、經(jīng)有限元離散后的線彈性結(jié)構(gòu)動(dòng)力學(xué)方程,以及自由液面、固液交界面、壁面邊界、無(wú)限遠(yuǎn)場(chǎng)邊界條件和初始條件等。(2)基于傳統(tǒng)的線性波浪疊加理論,對(duì)CFD軟件Fluent進(jìn)行了二次開發(fā),分別在二維和三維數(shù)值波浪水池中模擬畸形波。計(jì)算驗(yàn)證了極限聚焦波浪模型的局限性及組合波浪模型模擬畸形波的可行性。(3)基于雙向流固耦合的原理與方法,結(jié)合切片理論,在二維數(shù)值波浪水池中建立了畸形波與剛性浮式結(jié)構(gòu)物相互作用的數(shù)值模型,計(jì)算得到了波面變化及結(jié)構(gòu)物的運(yùn)動(dòng)時(shí)歷,并將計(jì)算結(jié)果與相關(guān)試驗(yàn)結(jié)果進(jìn)行對(duì)照,驗(yàn)證了本文方法的可行性。在此基礎(chǔ)上,通過(guò)一系列工況的計(jì)算,得到了結(jié)構(gòu)物周圍波面的變化情況、運(yùn)動(dòng)響應(yīng)、表面上浪水位高度和砰擊載荷等重要參數(shù),并分析甲板上浪機(jī)理,實(shí)現(xiàn)了波浪翻卷、飛濺等流體強(qiáng)非線性過(guò)程的數(shù)值模擬。(4)在三維數(shù)值波浪水池中建立了畸形波與鋁質(zhì)浮箱相互作用的耦合數(shù)值模型,計(jì)算了浮箱在畸形波中的運(yùn)動(dòng)響應(yīng)、水動(dòng)力響應(yīng)及結(jié)構(gòu)響應(yīng)等。
[Abstract]:The deformable wave is a kind of disaster wave with huge wave height, which is destructive to navigation and marine engineering equipment. At present, the theoretical equation of deformable wave has its limitations, and its generating mechanism and influencing factors are still unclear. Due to the low probability of abnormal waves and less measured data, the research work is still in the initial stage. There is less research on the interaction between deformable waves and marine floating structures. In this paper, the deformable waves and their interactions with floating structures are studied based on CFD method. The main contents and results are as follows: (1) based on hydrodynamic theory and structural dynamics theory, The fluid-solid coupling mathematical model of wave and structure interaction is established, including the incompressible continuity equation and N-S equation, the linear elastic structural dynamics equation after finite element discretization, and the interface between free liquid surface and solid-liquid interface. (2) based on the traditional linear wave superposition theory, the CFD software Fluent is developed to simulate the deformable waves in two-dimensional and three-dimensional numerical wave pools, respectively. The limitation of limit-focused wave model and the feasibility of combining wave model to simulate deformable wave are verified by calculation. (3) based on the principle and method of bidirectional fluid-solid coupling and slice theory, A numerical model of the interaction between deformable waves and rigid floating structures is established in a two-dimensional numerical wave pool. The wave surface variation and the time history of motion of the structures are obtained, and the calculated results are compared with the experimental results. The feasibility of this method is verified. On this basis, through a series of calculation conditions, the variation of wave surface around the structure, motion response, surface water level and slamming load are obtained, and the mechanism of deck wave rolling is analyzed. Numerical simulation of strong nonlinear process of spatter and other fluids. (4) the coupled numerical model of the interaction between deformable wave and aluminum floating box is established in the three-dimensional numerical wave pool, and the motion response of the floating box in the deformable wave is calculated. Hydrodynamic response and structural response etc.
【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】：2017
【分類號(hào)】：P75;P731.22

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本文編號(hào)：2377531