發(fā)布時(shí)間：2019-04-21 13:02

【摘要】：為了有效利用海洋空間資源,超大型浮體在海洋工程得到應(yīng)用。為了方便制造、運(yùn)輸以及安裝,大型浮式結(jié)構(gòu)物都由若干模塊組成,各個(gè)模塊之間并不是無縫連接,大都存在相對模塊特征長度很小的窄縫。除此之外,各種船舶進(jìn)行海上聯(lián)合作業(yè)時(shí),船體之間也會(huì)有縫隙存在。縫隙內(nèi)的水體在某些頻率波浪作用下會(huì)發(fā)生共振現(xiàn)象,誘發(fā)很大的波浪爬高和荷載,進(jìn)而對海洋結(jié)構(gòu)的作業(yè)安全帶來很大的影響。窄縫內(nèi)強(qiáng)烈的水體運(yùn)動(dòng)也會(huì)影響結(jié)構(gòu)前的反射波高以及透過結(jié)構(gòu)物的透射波高。實(shí)際海域的環(huán)境很復(fù)雜,除一般常見的規(guī)則波外,還有可能出現(xiàn)極值波浪。為了方便有效地研究此種波浪,可以將其近似為只有單一波峰,周期無限大的孤立波。孤立波含有驚人的能量,破壞力極大,對海洋結(jié)構(gòu)物的安全產(chǎn)生巨大的危害。因此,研究規(guī)則波和孤立波與帶窄縫箱體系統(tǒng)相互作用問題有很重要的意義。本文基于勢流理論,應(yīng)用高階邊界元方法建立了完全非線性二維數(shù)值水槽模型,模擬波浪與帶窄縫固定箱體系統(tǒng)相互作用問題。采用源造波法生成規(guī)則波,推板方法生成孤立波。自由表面滿足完全非線性自由水面運(yùn)動(dòng)學(xué)和動(dòng)力學(xué)邊界條件,并且在窄縫內(nèi)布置人工阻尼模擬由渦旋脫落和流動(dòng)分離引起的粘性耗散。對瞬時(shí)自由表面流體質(zhì)點(diǎn)采用混合歐拉-拉格朗日方法追蹤,采用四階Runge-Kutta法對下一時(shí)間步的波面升高和自由表面速度勢進(jìn)行更新。采用加速度式法求解結(jié)構(gòu)物體表面速度勢對時(shí)間的偏導(dǎo)數(shù),對瞬時(shí)物體濕表面上的水動(dòng)力壓強(qiáng)積分得到作用在物體上的波浪力。本文首先針對規(guī)則波與帶窄縫兩箱和三箱系統(tǒng)相互作用問題進(jìn)行了模擬研究,重點(diǎn)分析了窄縫內(nèi)對應(yīng)的共振頻率和波高,以及箱體的受力情況。針對孤立波與直墻相互作用問題,統(tǒng)計(jì)了孤立波在直墻上的爬高以及施加在直墻上的水平波浪力,通過與已發(fā)表的實(shí)驗(yàn)結(jié)果及數(shù)值結(jié)果進(jìn)行對比,驗(yàn)證模型模擬規(guī)則波與帶窄縫箱體系統(tǒng)相互作用問題以及孤立波與結(jié)構(gòu)物相互作用問題的正確性。然后考慮了箱體數(shù)量對箱體間窄縫內(nèi)水體共振頻率,共振波高,結(jié)構(gòu)物迎浪側(cè)和背浪側(cè)波高以及箱體波浪力的影響規(guī)律；超大型浮體是否開孔及孔隙數(shù)量對系統(tǒng)水動(dòng)力的影響規(guī)律；最后模擬了雙孤立波與帶窄縫雙箱體相互作用問題,著重研究了箱體尺寸,入射波高和兩波時(shí)間間隔對結(jié)構(gòu)物兩側(cè)波高以及受力的影響規(guī)律。
[Abstract]:In order to make effective use of ocean space resources, the super-large floating body has been applied in ocean engineering. In order to facilitate manufacturing, transportation and installation, large floating structures are composed of a number of modules, each module is not seamlessly connected, most of them have a narrow slot relative to the feature length of the module. In addition, when all kinds of ships carry out joint operations at sea, there will also be gaps between the hulls. The water body in the crevice will have resonance phenomenon under the action of some frequency waves, which will induce great wave climbing and load, which will bring great influence on the safety of the ocean structure. The intense water movement in the slit also affects the reflected wave height in front of the structure and the transmission wave height through the structure. The environment of the actual sea area is very complex, besides the common regular waves, extreme waves may also appear. In order to study this kind of wave conveniently and effectively, it can be approximated as solitary wave with only a single wave peak and infinitely large period. Solitary waves contain astonishing energy and great destructive power, which cause great harm to the safety of marine structures. Therefore, it is very important to study the interaction between regular wave and solitary wave with narrow slot box system. Based on the potential flow theory, a fully nonlinear two-dimensional numerical flume model is established by using the high-order boundary element method to simulate the interaction between waves and a fixed box system with a narrow slot. The source wave generation method is used to generate regular waves, and the push plate method is used to generate isolated waves. The free surface satisfies the fully nonlinear boundary conditions of kinematics and dynamics of free water surface, and the artificial damping is arranged in the narrow slot to simulate the viscous dissipation caused by vortex shedding and flow separation. The particle of instantaneous free surface fluid is tracked by mixed Euler-Lagrangian method, and the wave surface rise and free surface velocity potential of the next step are updated by the fourth-order Runge-Kutta method. The acceleration method is used to solve the partial derivative of the velocity potential on the surface of the structure to the time, and the wave force acting on the wet surface of the body is obtained by integrating the hydrodynamic pressure on the wet surface of the instantaneous object. In this paper, the interaction between regular wave and two-box and three-box system with narrow slot is simulated firstly, and the corresponding resonance frequency and wave height in the narrow slot are analyzed emphatically, as well as the stress of the box body. Aiming at the interaction between solitary wave and vertical wall, the climbing of solitary wave on the vertical wall and the horizontal wave force applied on the vertical wall are calculated. The results are compared with the published experimental results and numerical results. The model is proved to be correct in simulating the interaction between regular wave and narrow slot box system and the interaction between solitary wave and structure. Then, the influence of box number on the resonance frequency, resonance wave height, wave height of structure side and back wave side, and wave force of box body in the narrow slot between boxes is considered. The influence of box number on water resonance frequency, resonance wave height, wave height of structure side and back wave side and wave force are considered. Whether the super-large floating body has holes or not and the influence of the number of pores on the hydrodynamic force of the system; Finally, the interaction between double solitary wave and double box with narrow slot is simulated. The effects of box size, incident wave height and two-wave time interval on the wave height and force on both sides of the structure are studied emphatically.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P752;P731.2

【共引文獻(xiàn)】

相關(guān)期刊論文 前6條

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相關(guān)會(huì)議論文 前3條

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相關(guān)碩士學(xué)位論文 前2條

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本文編號：2462225