点击次数：

论文类型：期刊论文

发表时间：2012-11-01

发表刊物：OCEAN ENGINEERING

收录刊物：SCIE、EI、Scopus

卷号：54

页面范围：132-141

ISSN号：0029-8018

关键字：Freak wave; VOF method; Uneven bottom topography; Wavelet analysis

摘要：A numerical model is built by using an improved VOF method coupled with an incompressible Navier-Stokes solver. Exploiting the model, the freak wave formation due to the dispersive focusing mechanism is investigated numerically without uneven bottoms and in presence of uneven bottoms. During the freak wave transformation over an uneven bottom in finite water, combined effects of shoaling, refraction and reflection can modify the external characteristics of freak waves, and also can complicate the energy transfers. Furthermore, wavelet analysis method is adopted to analyze the behavior of the instantaneous energy structure of freak waves. It is found that when the bottoms vary in height, the external characteristic parameters and high frequency energy show a similar trend, but the value may be quite different due to the difference in local characteristic of the bottom. (C) 2012 Elsevier Ltd. All rights reserved.