华南理工大学学报(自然科学版) ›› 2009, Vol. 37 ›› Issue (6): 113-116,123.

• 力学 • 上一篇    下一篇

基于Benjamin—Feir不稳定性的畸形波模拟

胡金鹏1  张运秋2  朱良生1   

  1. 1. 华南理工大学 土木与交通学院, 广东 广州 510640;2. 中国科学院 可再生能源与天然气水合物重点试验室, 广东 广州 510640
  • 收稿日期:2008-07-02 修回日期:2008-08-05 出版日期:2009-06-25 发布日期:2009-06-25
  • 通信作者: 胡金鹏(1975-),男,讲师,博士,主要从事随机波及其对海洋工程结构物作用研究. E-mail:jphu@seut.edu.cn
  • 作者简介:胡金鹏(1975-),男,讲师,博士,主要从事随机波及其对海洋工程结构物作用研究.
  • 基金资助:

    国家自然科学基金资助项目(10772068);国家“863”计划项目(2006AA052426)

Simulation of Freak Waves Based on Benjamin-Feir Instability

Hu Jin-peng1  Zhang Yun-qiu2  Zhu Liang-sheng1   

  1. 1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. Key Laboratory of Renewable Energy and Gas Hydrate, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
  • Received:2008-07-02 Revised:2008-08-05 Online:2009-06-25 Published:2009-06-25
  • Contact: 胡金鹏(1975-),男,讲师,博士,主要从事随机波及其对海洋工程结构物作用研究. E-mail:jphu@seut.edu.cn
  • About author:胡金鹏(1975-),男,讲师,博士,主要从事随机波及其对海洋工程结构物作用研究.
  • Supported by:

    国家自然科学基金资助项目(10772068);国家“863”计划项目(2006AA052426)

摘要: 通过引入四阶非线性薛定谔方程,基于随机波列演化的Benjamin-Feir不稳定性,采用伪谱方法建立了二维深水波浪数值水槽来模拟海洋中的畸形波现象.为了验证该数值模型的有效性,计算了二维水槽中边带扰动随机波列的传播变形,通过比较数值和试验结果发现该模型可以很好地再现畸形波现象.

关键词: 畸形波, 四阶非线性薛定谔方程 Benjamin—Feir不稳定性, 伪谱方法, 数值水槽

Abstract:

In this paper, the four-order nonlinear Schrodinger equations and the pseudo-spectral method are introduced to develop a 2-D numerical water flume based on the Benjamin-Feir instability of random wave trains, which is adopted to simulate the freak waves in deep water. In order to verify the efficiency of the numerical water flume, the propagation distortion of random wave trains with sideband disturbances in a 2-D water flume is then simulated. The numerical results are finally compared with the test ones, showing that the proposed model simulates freak waves well.

Key words: freak wave, four-order nonlinear Schrodinger equation, Benjamin-Feir instability, pseudo-spectral method, numerical water flume