摘要
为了准确预报海洋平台气隙性能,提高平台的安全性,本文借助HydroStar软件对四柱结构在开敞海域和水槽中的水动力响应进行了模拟。基于线性势流理论和边界元方法,对不同圆柱半径下的四柱结构在波浪作用下的准陷波现象展开了对比研究。结果表明:圆柱半径的增大可以使准陷波模态的自振频率向高频移动,且对高阶准陷波模态的影响较为显著,并且导致波面分布特征的改变;决定准陷波现象发生频率的关键因素实际为圆柱侧壁间距;水槽横向立波自振频率与准陷波频率存在耦合作用,2种共振模态同时激发,导致对应频率附近波高峰值的显著增加。
To accurately predict the air gap performance of an offshore platform and improve the safety of the platform,the hydrodynamic characteristics of the structure in the open sea area and in the flume were investigated with the help of HydroStar.Based on the linear potential flow theory and the boundary element method,a comparative study of the near-trapping phenomena of the four-cylinder structure was carried out under wave action with cylinders of various radii.The results show that natural frequencies of the near-trapped mode move to a high frequency with an increase in the radius of the cylinder,and it has a significant impact on the higher-order near-trapped mode and causes the change in wave surface distribution characteristics;the spacing between the sidewalls of the cylinders is a key factor to determine the frequency of a near-trapping phenomenon;there are coupling effects between the frequencies of near-trapping and horizontal resonance,and they are excited at the same time,resulting in a significant increase in wave elevation near the corresponding frequency.
作者
纪翀
杜一豪
姜胜超
JI Chong;DU Yihao;JIANG Shengchao(School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Dalian 116024, China;State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2021年第4期482-490,共9页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(51909027).
