摘要
针对3个附属控制杆对深海立管的水动力影响问题,应用CFD大涡模拟方法模拟得到Re=1×105时附属控制杆在来流角α、直径比d/D和间距比G/D的不同参数组合下,升力、阻力和斯特劳哈尔数的变化规律以及立管绕流近壁区的流动特征。研究结果表明,附属杆的存在会干扰立管后方流场,引起尾流结构和涡脱落模式的改变,从而造成流体升力、阻力的变化。随着来流角α的增大,α在30°~60°时抑制效果较好,顺流向的阻力和横流向的升力均大幅减小;间距比G/D取0.2~0.3时附属控制管的布置方式对立管所受交变力的抑制效果最为明显。
A study on the mechanism of the three small-diameter control rods on the vortex induced vibration of marine riser was carried out by using the CFD technique through Large Eddy Simulation（ LES）. The variations of lift coefficient,drag coefficient and Strouhal number with combination of different parameters of angle of attack α,rod and cylinder diameter ratio d/D,rod-to-cylinder spacing ratio G/D and flow characteristics of the flow around cylinder in the near wall region were investigated at Re = 1 × 105. Research results showed that the presence of control rods will interfere with the flow field behind the riser,lead to the change of wake structure and vortex shedding mode. With the increase of the angle of attack α,α at 30° to 60° has shown better performance in VIV suppression. Both the drag in flow direction and the transverse in cross flow direction significantly reduced. When the rod-to-cylinder spacing ratio G/D ranges from 0. 2 to 0. 3,the arrangement mode of the control rods has the best performance in VIV suppression.
作者
吴延泽
WU Yan-ze(SINOPEC International Petroleum Service Corporation,Beijing 100020,China)
出处
《船海工程》
北大核心
2018年第3期182-185,共4页
Ship & Ocean Engineering
基金
国家自然科学基金(51474073)
