振荡流中二维圆柱的涡激振动数值模拟

Numerical simulation of vortex-induced vibration of a 2D cylinder in oscillatory flow

    摘要
  • 摘要:
      目的  在实际油气采集过程中，风、浪和海流的联合作用会使得平台做周期性的振荡运动，并在与平台相连的立管和海水间产生振荡流。圆柱在振荡流中的泄涡特性与在均匀流中的泄涡特性存在明显区别。
      方法  采用基于OpenFOAM开源平台自主开发的具有重叠网格功能的CFD求解器naoe-FOAM-SJTU，对在静水中做周期性振荡运动的二维刚性圆柱涡激振动进行数值模拟。首先，进行KC=3时的网格收敛性验证；随后，对KC=12时的振荡流中二维圆柱开展数值模拟。
      结果  通过数值模拟结果对比，发现圆柱的横向振动加剧了升力系数的变化，使得泄涡方向和圆柱表面漩涡分离点的位置发生了明显变化。
      结论  所得研究成果可作为基于切片法的振荡流中细长柔性立管涡激振动数值研究的基础。

     

    Abstract:
      Objectives  In the actual oil and gas exploitation, the combined actions of wind, waves and currents may cause the offshore platform to oscillate periodically, and then the relative oscillatory flow is generated between risers connected to the platform and the seawater. And there is significant difference in vortex shedding features existing between cylinders in oscillatory flow and in uniform flow.
      Methods  The Vortex-induced Vibration(VIV) of 2D rigid cylinder periodic oscillating motion in still water is numerically simulated by using the CFD code naoe-FOAM-SJTU solver with overset function developed by OpenFOAM open source platform. Firstly, the grid convergence study is conducted for verification at KC=3. Then, the numerical simulation of 2D cylinder in oscillatory flow is conducted at KC=12.
      Results  The comparisons of the results show that, the change of lift force coefficient increases under the effect of cross-flow vibration; the vortex trail direction and the position of the vortex separation points on the surface of the cylinder change significantly.
      Conclusions  The research achievements in this paper can be used as the basis of VIV of a flexible riser in oscillatory flow using strip method.

     

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