内孤立波作用下半潜平台荷载及其周围流场数值模拟研究

内孤立波对海洋平台的安全运行存在一定的威胁,基于三维数值水槽对内孤立波传播引起的半潜平台受力及其周围流场的分布进行了数值模拟研究.通过与试验对比,分析了入射波幅和分层流体深度比对半潜平台上内孤立波荷载特性的影响规律,验证了数值模拟结果是准确可靠的.研究表明,内孤立波引起的平台荷载会随着内孤立波波幅的增加而增大,随着分层流体深度比的增加而减小.基于对平台周围剖面速度场和三维涡场的演化规律研究,发现在内孤立波传播过程中,平台周围会出现明显的速度减小区,平台周围会有大量的漩涡产生并发生脱落现象.

Numerical simulation of load and flow field around semi-submersible platform under internal solitary wave

Internal solitary wave (ISW) is a threat to the safe operation of offshore platforms. Based on three-dimensional numerical flume, the force on semi-submersible platform and the distribution of flow field around it caused by ISW are numerically simulated. Through the comparison with the distribution of loads on the platform obtained from the experiments, it is verified that the numerical simulation results are accurate and reliable. The results show that the platform load caused by ISW increases with the increase in ISW amplitude and decreases with the increase in the fluid depth ratio. Based on the study of the evolution of the velocity field and three-dimensional vortex field around the platform, it is found that there will be obvious velocity decreasing zones around the platform during the propagation of the ISW, and a large number of vortices will appear and fall off around the platform.