海洋浮式平台气隙的数值预报

Study on Numerical Prediction of Air Gap of Offshore Floating Platform

以海洋浮式平台为研究对象,运用三维势流理论结合半经验Morison方程的方法计算其水动力系数及运动响应传递函数。针对北大西洋百年一遇的海况,对平台气隙进行预报。研究结果表明:平台的水动力性能与波浪频率密切相关,平台气隙预报显示波浪在甲板箱首尾部分的负气隙严重,即有强烈的波浪砰击现象,这就要求平台结构设计时要充分考虑到该区域的波浪砰击载荷。

The paper takes offshore floating platform as the study object. The hydrodynamic coefficients and the transfer functions of motion responses are calculated by the three-dimensional potential theory combining with the semi empirical Morison equation. Aiming at the once-during-a-hundred-year sea condition in the North Atlantic Ocean, the air gap of the platform is predicted. The results demonstrate a close relation between the hydrodynamic performance of the platform and the wave frequency. The air gap prediction of the platform indicates that there are severe negative air gaps at the head and the tail of the deck trunk, which has the phenomenon of strong wave slamming. It requires that the wave slamming of those sections should be considered sufficiently in the design of platform structure.