实际钻井隔水管通常含6根附属管线，近期研究表明，实际隔水管外挂的附属管线对主管有一定的流动控制效果，它是否有涡激振动(vortex-induced vibration ，VIV) 抑制作用亟待研究，针对这一问题开展数值模拟研究。基于RANS （Reynolds-averaged Navier-Stokes ） 方程，结合k-ω湍流模型，采用二次开发的嵌入多圆柱运动求解模块的OpenFOAM求解器，对不可压缩流体进行计算流体动力学（computational fluid dynamics,CFD）求解，再耦合结构动力学模型，进行流固耦合求解。研究了亚临界区雷诺数为20 000~85 000、典型约化速度为3~12、来流攻角为0°~330°的实尺寸钻井隔水管系统的涡激振动响应。结果表明，附属管对钻井隔水管的整体涡激振动整体具有抑制作用，抑制效果与来流攻角和约化速度密切相关,当来流攻角为210°和330°时抑制效果最好。隔水管系统的横流向涡激振动较为剧烈时功率谱有峰值较大的唯一主频，此时主频接近于隔水管系统的固有频率。实尺寸钻井隔水管系统的涡激振动运动轨迹有多种形式，如雨滴形、倾斜倒立雨滴形、倾斜非对称“8”字形和近似椭圆形等。
Abstract
The actual drilling riser system usually is installed with six auxiliary pipes.Recent studies have shown that the pipes have a certain flow control effect on the mainline.Whether it has vortex-induced vibration (VIV) suppression effect needs to be studied, so a numerical simulation study for this problem was carried out.Based on the Reynolds-averaged Navier-Stokes（RANS） equations, combined with the k-ω turbulence model, the OpenFOAM solver of the embedded multi-cylinder motion solving module was used to get the computational fluid dynamics（CFD）solution of the incompressible fluid,and then the structural dynamics model was used coupledly to solve the fluid-structure interaction.The research focused on an oscillating drilling riser system at Reynolds number 20 000-85 000, typical reduced velocity 3-12 and angle of attack 0°-330°.The results show that the pipes have a suppression effect on the VIV of the drilling riser in general, and the effect is related closely to the incoming angle of attack and the reduced velocity.It shows the best suppression effect when the angle of attack is 210°and 330°.When the cross-flow VIV is relatively severe, the power spectrum has a unique peak frequency.The main frequency is close to the natural frequency of the riser system.The VIV orbit trajectory of the riser system has various shapes, such as raindrop orbit, inclined inverted raindrop orbit, inclined asymmetric “8” orbit and sub-oval shaped orbit.
关键词
实尺寸钻井隔水管 /
附属管 /
涡激振动(VIV) /
数值模拟 /
抑制
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Key words
actual size drilling riser system /
auxiliary line /
vortex-induced vibration(VIV) /
numerical simulation /
suppression effect
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