摘要
[目的]长时间持续的涡激运动可能会引起Spar平台锚泊系统疲劳甚至是平台结构损坏,因此,必须充分考虑到涡激运动的不利影响。[方法]利用自主开发的CFD求解器naoe-FOAM-SJTU以及动网格方法,对Spar平台的涡激运动流场特性进行数值模拟。采用基于剪切输运应力方程的延时分离涡(SST-DDES)湍流模式,对带螺旋侧板的Spar平台的三维精细尾涡结构进行模拟,研究其在不同折合速度下的纵向、横向、艏摇运动响应以及运动轨迹。采用水平线性弹簧系统替代模拟平台系泊系统,并在研究中考虑平台不同自由度间的耦合作用对平台涡激运动的影响,然后将数值模拟结果与模型试验结果进行对比,分析带螺旋侧板的Spar平台横向和流向运动时间历程、频谱特性、锁定现象等,以揭示其涡激运动的内在机理。[结果]结果显示,加装螺旋侧板可有效减小Spar平台涡激运动响应幅值;采用自主开发的CFD求解器计算模拟海洋平台涡激运动问题具有良好的精度和可靠性。[结论]带螺旋侧板Spar平台涡激运动的数值模拟分析对Spar平台实际设计工作具有重要意义。
[Objectives]Long-lasting Vortex Induced Motion(VIM)may cause the Spar platform mooring system fatigue and even the structure damage.Therefore,the adverse effects of VIM must be fully taken into account.[Methods]In this paper,the CFD solver naoe-FOAM-SJTU and dynamic grid method developed by ourselves are used to make numerical simulation of the characteristics of the vortex induced flow field around the Spar platform.The time Delayed Detached-Eddy Simulation(DDES)turbulence model based on shear-transport-stress equation is used to simulate the three-dimensional fine wake vortex structure of the Spar platform with helical strakes.The longitudinal motion,transverse motion and yawing of the Spar platform with helical strakes at different reduced velocities are studied.The platform mooring system is stimulated by using the linear spring system.The research also takes into account the effects that the platform coupling effect at different degrees has on VIM.Then the numerical simulation results are compared with the model test results,to analyze the time history,spectral characteristics and locking of longitudinal and transverse VIM of Spar platform with helical strakes and to reveal the intrinsic mechanism of VIM.[Results]The results show that the helical strakes can effectively reduce the response amplitude of Spar platform' s VIM;the CFD solver naoe-FOAM-SJTU has good accuracy and reliability for the calculation and simulation of the offshore platforms' VIM.[Conclusions]The numerical simulation and analysis of the VIM of Spar platform with helical strakes is of great significance to the practical design of Spar platform.
作者
何佳伟
赵伟文
万德成
He Jiawei;Zhao Weiwen;Wan Decheng(State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai 200240,China;School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《中国舰船研究》
CSCD
北大核心
2019年第4期74-84,共11页
Chinese Journal of Ship Research
基金
国家自然科学基金资助项目(51879159,51490675,11432009,51579145)
长江学者奖励计划资助项目(T2014099)
上海高校东方学者特聘教授岗位跟踪计划资助项目(2013022)
上海市优秀学术带头人计划资助项目(17XD1402300)
工信部数值水池创新专项VIV/VIM项目(2016-23/09)
关键词
SPAR平台
螺旋侧板
涡激运动
延时分离涡模拟
Spar platform
helical strakes
Vortex Induced Motion(VIM)
Delayed Detached-Eddy Simulation(DDES)
