大长细比柔性立管涡激振动数值模拟  

Simulation of vortex-induced vibrations of a long flexible riser

作　　者：付博文 端木玉[1,2] 万德成 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院海洋工程国家重点实验室,上海200240 [2]高新船舶与深海开发装备协同创新中心,上海200240

出　　处：《江苏科技大学学报（自然科学版）》2017年第5期640-645,共6页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金资助项目(51379125;51490675;11432009;51579145);长江学者奖励计划(T2014099);上海高校东方学者特聘教授岗位跟踪计划(2013022);上海市优秀学术带头人计划(17XD1402300);上海市船舶工程重点实验室基金(K2015-11);工信部数值水池创新专项VIV/VIM项目(2016-23/09)

摘　　要：近年来,随着油气开发逐步向深海发展,立管的长细比可以达到1 000甚至更高.大长细比的立管的振动形态与短的刚性圆柱的振动具有较大的差异,这使得对大长细比立管涡激振动预测的需求较为迫切.文中基于切片理论,通过使用径向基函数法作为OpenFOAM中的动网格策略,模拟了长细比为1 000的柔性立管在横流向和顺流向的振动,其顺流向最大时均偏移量达8个立管直径.数值模拟重现了高阶主控模态及主控模态的频繁变换等大长细比柔性立管的涡激振动特性;文中还将所得结果与长细比为500,750的结果进行了比较,就长细比对立管涡激振动的影响进行了分析.As oil exploration moves increasingly to deeper waters,aspect ratios of risers can be of order 1 000 or even higher. Long flexible risers tend to vibrate at high mode numbers and the complex added mass distributions add extra complexity. As a result,the need to develop a reliable numerical method for prediction of VIV response of long flexible risers arises. Based on strip theory,the solver viv-FOAM-SJTU is developed on the open source code package,OpenFOAM. Radial Basis Function Method is applied to handle the dynamic mesh,which makes it possible to simulate the vibrations of a flexible riser of aspect ratio 1 000,with maximum time-averaged in-line displacement reaching 8 times riser diameters. The vibration features of extreme long risers such as mode transition have been reproduced. The result has been compared with cases with aspect ratios of 500 and 750,also the effects of aspect ratio upon the vibration responses of risers have been studied.

关 键 词：立管 涡激振动 计算流体力学 多模态振动 切片理论 viv-FOAM-SJTU求解器 

分 类 号：O35[理学—流体力学]