风对二维极值波作用的数值研究
发布时间：2019-04-28 11:21
【摘要】：实际海域中风浪往往共存,当极值波浪出现时,风会对其特性产生很大影响。为了研究风对极值波浪特性的影响规律,该文基于势流理论建立自由水面满足完全非线性边界条件的风浪混合作用数值水槽模型,通过实时模拟造波板运动产生入射波,并基于波群聚焦原理定点产生极值波浪,利用改进的杰弗里斯遮蔽原理(Jeffreys'sheltering mechanism)将风压引入到自由水面动力边界条件中。在时域模拟中,采用混合欧拉-拉格朗日方法追踪瞬时水面,利用格林第二定理建立了边界积分方程,采用高阶边界元方法进行离散求解。通过与已发表实验结果对比验证模型的准确性,进而开展数值实验研究风对极值波浪水动力特性的影响,包括聚焦幅值、聚焦位置和极值波高随风速的变化以及波群聚焦和解焦过程波浪演变特性等。
[Abstract]:Wind waves often coexist in the actual sea area, when extreme waves appear, the wind will have a great influence on its characteristics. In order to study the influence of wind on extreme wave characteristics, a numerical flume model of wind-wave mixing on free water surface satisfying completely nonlinear boundary conditions is established based on the potential flow theory, and the incident wave is generated by real-time simulation of the motion of the wave-making plate. Based on the wave group focusing principle, extreme waves are generated at fixed points, and the wind pressure is introduced into the dynamic boundary conditions of free water surface by using the modified Jeffries masking principle (Jeffreys'sheltering mechanism). In the time domain simulation, the hybrid Euler-Lagrangian method is used to track the instantaneous water surface, the boundary integral equation is established by Green's second theorem, and the higher order boundary element method is used to discretize the solution. The accuracy of the model is verified by comparing with the published experimental results, and then numerical experiments are carried out to study the influence of wind on the hydrodynamic characteristics of extreme waves, including focusing amplitude. The variation of focusing position and extreme wave height with wind speed and the wave evolution characteristics in the process of focusing and defocusing of wave group.
【作者单位】： 大连理工大学海岸和近海工程国家重点实验室;河海大学水文水资源与水利工程科学国家重点实验室;
【基金】：国家自然科学基金(51222902,51490672) 教育部新世纪优秀人才计划(NCET-13-0076)~~
【分类号】：O353.2
，
本文编号：2467588
[Abstract]:Wind waves often coexist in the actual sea area, when extreme waves appear, the wind will have a great influence on its characteristics. In order to study the influence of wind on extreme wave characteristics, a numerical flume model of wind-wave mixing on free water surface satisfying completely nonlinear boundary conditions is established based on the potential flow theory, and the incident wave is generated by real-time simulation of the motion of the wave-making plate. Based on the wave group focusing principle, extreme waves are generated at fixed points, and the wind pressure is introduced into the dynamic boundary conditions of free water surface by using the modified Jeffries masking principle (Jeffreys'sheltering mechanism). In the time domain simulation, the hybrid Euler-Lagrangian method is used to track the instantaneous water surface, the boundary integral equation is established by Green's second theorem, and the higher order boundary element method is used to discretize the solution. The accuracy of the model is verified by comparing with the published experimental results, and then numerical experiments are carried out to study the influence of wind on the hydrodynamic characteristics of extreme waves, including focusing amplitude. The variation of focusing position and extreme wave height with wind speed and the wave evolution characteristics in the process of focusing and defocusing of wave group.
【作者单位】： 大连理工大学海岸和近海工程国家重点实验室;河海大学水文水资源与水利工程科学国家重点实验室;
【基金】：国家自然科学基金(51222902,51490672) 教育部新世纪优秀人才计划(NCET-13-0076)~~
【分类号】：O353.2
，
本文编号：2467588
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