【作者】 李宏伟；

【导师】 庞永杰；

【作者基本信息】 哈尔滨工程大学 ， 流体力学， 2009， 硕士

【摘要】 造波是船舶与海洋工程领域内的一项重要的试验技术。随着计算机与计算流体力学的不断发展,以数值造波技术为核心构建的数值波浪水池,为船舶及海洋工程结构物在波浪中的运动响应的研究提供了强有力的技术支持,因此,数值造波技术与数值波浪水池的研究一直是近年来船舶与海洋工程水动力学界的前沿课题。本论文利用较成熟的商业软件FLUENT,使用VOF方法,结合RNGκ-ε模型,通过求解Navier-Stokes方程,对当前数值造波技术中具有代表意义的仿物理造波方法与源函数造波方法在二维模式下进行了较为系统的研究并对三维模式下的数值造波进行了初步探讨。在仿物理造波的研究中,以真实水池中最为常见的摇板式造波机为研究对象,利用动网格技术与阻尼消波技术,在数值水池中模拟了摇板式造波机生成线性规则波与不规则波时的情况,取得了令人满意的模拟结果。在源造波法的研究中,利用在质量守恒方程中添加造波源的方法并结合阻尼消波技术,在数值水池中较好地模拟了线性规则波、不规则波,Stokes波及孤立波。在对三维模式下数值造波的初步探讨中,采用UDF宏设置造波边界条件的纯数值造波方法生成了在三维数值水池中正向传播的Stokes波,此外对多摇板组成“蛇形运动”时生成斜向波的情况进行了初步模拟。本文在二维模式下的数值造波结果可以作为研究二维数值波浪水池中波浪与结构物相互作用的波浪条件,在三维模式波浪正向传播的数值造波结果可作为简单三维问题的波浪条件,但对斜波的模拟还处于初步探讨阶段,需要日后进一步的研究与改进。本文所作的工作为进一步研究多向造波技术积累了一定经验。更多还原

【Abstract】 Wave-generating technology is an important test technology in the shipbuilding and ocean engineering fields. With the developments of the computer and computational fluid dynamics, the numerical wave tank, taken the wave-making technology as the core part, supplies strong technical support which is about the marine structural responses under the wave environment. Therefore, the numerical wave-generating technology and the numerical wave tank are the frontiers of the shipbuilding and ocean engineering hydrodynamic circles in these days.In this thesis, the Navier-Stokes equation was solved by the VOF method, combined with the RNG k-εmodel using the CFD software-FLUENT. Through the solution, there is the research on the two dimensional physics wave-generating imitating method and source wave-generating method which are outstanding in the numerical wave-making technology. The three dimensional numerical wave-making was discussed as an introduction. In the physics wave-generating imitating method study, the research subject was the rocker-flap wave maker which was main component in the real tank. In the numerical wave tank, the simulation, using the dynamic grid and wave damping absorbing technology, was concerned with the rocker-flap wave maker generated the linear regular wave and irregular wave. The simulation results were desirable. In the source wave-generating study, the wave-making source was added to the mass conservation equation combined with the wave damping absorbing technology to simulate linear regular wave, irregular wave, Stokes wave and solitary wave very well. In the discussion of three dimensional numerical wave-making, the forward propagating Stokes wave was simulated in the 3 dimensional tank by adopting the pure numerical wave-making method which employed the UFD macro to set the boundary condition. Moreover, oblique wave was preliminarily simulated by multi-rocker-flap making the snake-tape locomotion.The two dimensional numerical wave-generating results could be as the wave condition of the interaction between wave and structure in the two dimensional numerical wave tank. The three dimensional simulated forward propagating wave could be the wave condition of the three dimension problem. But the oblique wave simulation was still in the basic stage, it should be improved in the following days. The study in this paper supply some experience for the multidirectional wave-generating technology.更多还原