数值浪槽的建立与应用研究

发布时间：2018-02-05 03:24

本文关键词： 数值浪槽流体体积法海上风机风浪联合作用　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：海洋中存在风能、波浪能等多种可再生资源。数值浪槽是评估人工俘能装置在恶劣海洋环境下安全性的重要工具。其中结合有限体积法(FVM)与流体体积法(VOF)的数值浪槽,通过对纳维-斯托克斯方程的直接求解,可以考虑流体的粘性,并有能力模拟波浪破碎以及风浪相互作用等复杂过程。本文采用了这一数值离散方案,结合势流理论完成了数值造波,通过建立的数值浪槽研究了波浪的运动规律,并通过与海上风机计算程序的连接,把数值浪槽生成的完全非线性波浪应用于海上风机的波浪力计算中。本文首先进行了数值浪槽的建立,以及对于规则波的模拟与验证。将势流理论得到的解析结果作为数值造波的理论依据,分别使用速度入口法和运动物体法两种方式造波,使用人工阻尼区进行远端消波。在有限长度的二维数值浪槽中进行了规则波的模拟与验证。使用数值浪槽的结果分析了规则波的水平速度沿竖向截面分布规律,验证了Wheeler展开理论对于波峰所在竖向截面的速度修正方法。随后使用运动物体法对数值浪槽进一步发展,完成了不规则波的模拟与验证。模拟了由于不规则波的不同频率成分在波浪表面局部区域聚焦而产生水粒子速度过大从而发生波浪破碎的过程。对于自然界中存在的风浪联合环境,本文进行了稳定风与规则波下风浪相互作用的初步探讨,发现了稳定风会降低规则波波幅的现象,并从波浪表面压力不均匀分布的角度对波高降低现象进行了定量分析。最后,作为数值浪槽与工程应用相结合的示例,本文将数值浪槽得到的完全非线性不规则波浪应用于固定单桩式近海风机的波浪力计算中,发现传统的波浪模型可能会低估波浪荷载。
[Abstract]:Wind energy exists in the ocean. Wave energy and other renewable resources. Numerical wave grooves are important tools for evaluating the safety of artificial energy capture devices in harsh marine environments. The finite volume method (FVM) is combined with the fluid volume method (VOF). Of the numerical grooves. Through the direct solution of the Navier-Stokes equation, the viscosity of the fluid can be considered and the complex processes such as wave breaking and wind wave interaction can be simulated. This numerical discrete scheme is used in this paper. Combined with the potential flow theory, the numerical wave generation is completed, and the motion law of the wave is studied through the established numerical wave trough, which is connected with the calculation program of the offshore fan. The completely nonlinear wave generated by numerical wave grooves is applied to the wave force calculation of offshore fan. In this paper, the numerical wave trough is established, and the simulation and verification of the regular wave are carried out. The analytical results obtained from the potential flow theory are taken as the theoretical basis for the numerical wave generation. The velocity inlet method and the moving object method are used to generate waves respectively. Artificial damping region is used for far-end wave elimination. The regular wave is simulated and verified in a 2-D numerical wave trough with finite length. The horizontal velocity distribution of regular wave along vertical section is analyzed using the results of numerical wave slot. The velocity correction method for vertical cross section of wave peak is verified by Wheeler expansion theory. Then the moving object method is used to further develop the numerical wave trough. The simulation and verification of irregular wave are completed, and the process of wave breaking is simulated because the different frequency components of irregular wave focus in the local region of the wave surface and the velocity of water particle is too large. In this paper, the interaction between steady wind and regular wave is discussed, and the phenomenon that steady wind decreases the amplitude of regular wave is found. The phenomenon of wave height decreasing is analyzed quantitatively from the angle of uneven distribution of wave surface pressure. Finally, as an example of the combination of numerical wave trough and engineering application, the completely nonlinear irregular wave obtained by numerical wave trough is applied to the wave force calculation of fixed single pile offshore fan. It is found that traditional wave models may underestimate wave loads.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV139.2

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