小型漂流观测平台水动力特性数值模拟研究  

Study on numerical simulation of hydrodynamic characteristics of portable drifting observation platform

作　　者：陈祚琛 王斌[2] 张金凤[1] CHEN Zuo-chen;WANG Bin;ZHANG Jin-feng(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300350,China;National Ocean Technology Center,Tianjin 300112,China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300350 [2]国家海洋技术中心,天津300112

出　　处：《水动力学研究与进展（A辑）》2021年第5期668-676,共9页Chinese Journal of Hydrodynamics

基　　金：2020省级促进经济高质量发展专项(GDNRC[2020]053);江苏省海洋科技创新项目(JSZRHYKJ202009)。

摘　　要：小型漂流观测平台的运动姿态是影响其观测准确性和安全性的关键问题,如何改善其在波浪作用下的运动性能是目前亟需解决的问题之一。该文采用Open FOAM建立三维数值波浪水池模型,基于重叠网格技术模拟观测平台在波浪中的运动。在利用物理试验数据验证数值模型模拟准确性的基础上,研究球状浮体、柱状浮体及球-柱结合体等浮体外型对观测平台稳定性的影响。结果表明:三者垂荡运动响应较为接近,随波性能相当;球状浮体及柱状浮体的纵摇幅值均值为±15°,而球-柱结合体纵摇幅值均值为±11°,摇摆幅值降低27%,漂流稳定性更好;此外,波高对浮体运动影响显著,小波高条件下浮体具有更好的随波性和稳定性;而波浪周期对浮体的垂荡运动影响较大,对纵摇运动影响呈非线性变化,浮体在周期较大情况下具有较好随波性。he motion characteristics of portable drifting observation platform is one of important factors for the observation accuracy and security,and how to improve platform’s motion performance in wave comes to be a valuable question.Based on the OpenFOAM software,a three-dimensional numerical wave tank is developed,and then the overset grid technique is adopted to simulate the motion of platform in wave.On the basis of verifying the accuracy of the numerical model with the experimental data,three different floating platforms are designed and then used to study the motion properties.Comparing the simulation results,the heave motion of the three different floating platforms are about the same response,the wave-following performance are equivalent;for pitch motion,the mean amplitude of spherical floating body and columnar floating body are±15°,and the sphericalcolumnar floating body is±11°,swing amplitude decreased by 27%,showing to have better motion stability.In addition,wave height has significant influence on floating body motion,the body owns better wave-following and stability under small wave height conditions;besides,wave period has evident influence on the heave motion of the floating body,but appears to be nonlinear effect on the pitch motion,and the floating body shows good wave-following property under longer period.

关 键 词：小型漂流观测平台 数值波浪水池 重叠网格 水动力 

分 类 号：P715.4[天文地球—海洋科学]