摘要
海洋平台立管在波浪的作用下易产生涡激振动现象(VIV),这会造成立管的疲劳损坏、缩短立管的使用寿命,还会严重威胁立管的安全稳定。为了抑制立管的涡激振动现象,提高立管的使用寿命和安全性,使用通用流体力学软件FLUENT中的动网格技术和用户自定义函数(UDF)进行造波,并采用流体体积法(VOF)监测波高建立数值波浪水池模型,基于此模型应用被动控制方法,即在立管前加一干扰柱研究海洋平台立管涡激振动抑制问题。研究表明:在立管前加一干扰柱,可以减小立管所受到的升阻力系数,从而达到抑制立管涡激振动现象;改变立管与干扰柱的距离(间距比),计算所得的立管的升阻力系数变化不大,说明改变间距比对立管的涡激振动现象没有影响。
The offshore platform riser is prone to vortex-induced vibration (VIV) under the action of waves, which will create fatigue damage to the pipe, shorten the service life of riser, and seriously threaten the safety and stability of the riser. In order to suppress the vortex-induced vibration phenome- non of riser and improve the service life and safety of riser,the dynamic mesh technology and the user- defined function (UDF) in a common fluid mechanics software, FLUENT, is used to make waves, and the fluid volume method (VOF) is adopted to monitor wave height to establish a numerical wave pool model. Based on this model,the passive control method is used,namely adding an interference column in front of the riser to study the suppress problem of vortex-induced vibration in offshore plat- form riser. Studies show that adding a disturbing column in front of the riser can reduce the rising resis- tance coefficient of riser, thereby suppressing the vortex-induced vibration of the riser. Meanwhile, changing the distance between the riser and the disturbing column,namely the pitch ratio,the calcu- lated rising resistance coefficient of riser does not change much,indicating that changing the pitch has no effect on the vortex-induced vibration phenomenon of riser.
作者
王小兵
王学兵
李武生
WANG Xiaobing;WANG Xuebing;LI Wusheng(Petroleum Engineering Department of Changzhou University;Directional Well Drilling Company of Bohai Drilling Engineering Co.,Ltd,CNPC)
出处
《油气田地面工程》
2019年第7期104-109,共6页
Oil-Gas Field Surface Engineering
关键词
海洋平台
立管
涡激振动
造波
动网格
流体体积法
offshore platform
riser
vortex-induced vibration
wave making
dynamic grid
fluidvolume method
