波浪与带窄缝箱体系统作用的非线性数值模拟
发布时间：2019-04-21 13:02
【摘要】：为了有效利用海洋空间资源,超大型浮体在海洋工程得到应用。为了方便制造、运输以及安装,大型浮式结构物都由若干模块组成,各个模块之间并不是无缝连接,大都存在相对模块特征长度很小的窄缝。除此之外,各种船舶进行海上联合作业时,船体之间也会有缝隙存在。缝隙内的水体在某些频率波浪作用下会发生共振现象,诱发很大的波浪爬高和荷载,进而对海洋结构的作业安全带来很大的影响。窄缝内强烈的水体运动也会影响结构前的反射波高以及透过结构物的透射波高。实际海域的环境很复杂,除一般常见的规则波外,还有可能出现极值波浪。为了方便有效地研究此种波浪,可以将其近似为只有单一波峰,周期无限大的孤立波。孤立波含有惊人的能量,破坏力极大,对海洋结构物的安全产生巨大的危害。因此,研究规则波和孤立波与带窄缝箱体系统相互作用问题有很重要的意义。本文基于势流理论,应用高阶边界元方法建立了完全非线性二维数值水槽模型,模拟波浪与带窄缝固定箱体系统相互作用问题。采用源造波法生成规则波,推板方法生成孤立波。自由表面满足完全非线性自由水面运动学和动力学边界条件,并且在窄缝内布置人工阻尼模拟由涡旋脱落和流动分离引起的粘性耗散。对瞬时自由表面流体质点采用混合欧拉-拉格朗日方法追踪,采用四阶Runge-Kutta法对下一时间步的波面升高和自由表面速度势进行更新。采用加速度式法求解结构物体表面速度势对时间的偏导数,对瞬时物体湿表面上的水动力压强积分得到作用在物体上的波浪力。本文首先针对规则波与带窄缝两箱和三箱系统相互作用问题进行了模拟研究,重点分析了窄缝内对应的共振频率和波高,以及箱体的受力情况。针对孤立波与直墙相互作用问题,统计了孤立波在直墙上的爬高以及施加在直墙上的水平波浪力,通过与已发表的实验结果及数值结果进行对比,验证模型模拟规则波与带窄缝箱体系统相互作用问题以及孤立波与结构物相互作用问题的正确性。然后考虑了箱体数量对箱体间窄缝内水体共振频率,共振波高,结构物迎浪侧和背浪侧波高以及箱体波浪力的影响规律；超大型浮体是否开孔及孔隙数量对系统水动力的影响规律；最后模拟了双孤立波与带窄缝双箱体相互作用问题,着重研究了箱体尺寸,入射波高和两波时间间隔对结构物两侧波高以及受力的影响规律。
[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.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P752;P731.2
本文编号：2462225
[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.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P752;P731.2
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