摘要
为了研究静水压力和瞬态流场载荷对三维柔性立管湿模态的影响,本文基于声-固耦合模型对考虑水介质、顶张力情况下的立管进行湿模态计算,并与理论计算结果以及实验数据对比,验证了该模型的准确性;采用不考虑流-固耦合的计算流体力学(computational fluid dynamics,CFD)方法和考虑流固双向耦合的计算流体力学/计算结构力学(computational fluid dynamics/computational structure dynamics,CFD/CSD)方法分别计算了立管的瞬态流场载荷,并与实验数据对比;将水深产生的静水压力和瞬态流场载荷分别加载到三维柔性立管表面进行静力学分析,计算其湿模态。计算结果表明:立管湿模态频率比干模态频率小很多,且随着顶张力增大而增大;静水压力和瞬态流场载荷都使得湿模态频率略微增加;静水压力和瞬态流场载荷对湿模态低阶振型影响较大,对高阶振型几乎没有影响。
To analyze the influence of static hydro-pressure and transient flow field loads on the wet modal vibration of a 3D PVC flexible riser, a wet model of the flexible riser based on an acoustic structure coupling model that coniders water media and top tension was first calculated under different conditions. Good agreement between the results and the experimental data was achieved. Then, the transient flow field loads were calculated by computational fluid dynamics （CFD）, which did not consider the fluid-structure coupling, and the CFD/CSD two-way coupling method, which considered the fluid structure interaction. Simulation results agreed well with the experimental data. Subsequently, the static hydro-pressure and the transient flow field loads caused by water depth were loaded to the 3D flexible riser. Then, static analysis was conducted, and wet modal simulation was performed. Calculation re- suits show that wet modal frequency is much smaller than dry modal frequency, and the wet modal frequency increased with the increase in tension. The static hydro-pressure and the transient flow field loads can increase the wet modal frequency slightly. Moreover, the static hydro-pressure and the transient flow field loads have a stronger effect on low-order modes and no effect on high-order modes.
作者
陈东阳
Laith K.Abbas
王国平
芮筱亭
CHEN Dongyang;LAITH K. Abbas;WANG Guoping;RUI Xiaoting(Institute of Lunch Dynamics, Nanjing University of Science ＆ Technology, Nanjing 210094, China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2017年第10期1587-1594,共8页
Journal of Harbin Engineering University
基金
国防基础科研项目(B2620132013
A2620133008)
国家自然科学基金项目(11472135)
关键词
湿模态
声-固耦合模型
涡激振动
顶张力
柔性立管
瞬态流场载荷
湍流模型
干模态
wet mode
acoustic-solid coupling model
vortex-induced vibration （VIV）
top tension
flexible riser
transient flow field loads
turbulence model
dry mode
