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首页> 外文期刊>International Journal of Offshore and Polar Engineering >Vertical Riser VIV Simulation in Sheared Current
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Vertical Riser VIV Simulation in Sheared Current

机译：剪切电流中的垂直立管VIV仿真

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This paper studied a vertical riser VIV under sheared current using numerical simulation and presented the results and their comparisons to published experimental data. The riser was made of a 9.63-m brass pipe with an OD of 0.02 m (L/D = 482) and mass ratio of 1.75. In the experiment the riser was positioned inclined with top tension of 817N and pinned at its 2 ends to the test rig. Rotating the rig in the wave tank would simulate the sheared current. In our numerical simulation we pinned the riser's ends to the ground and imposed a linearly sheared far field incoming current. The riser and its surrounding fluid were discretized using 1.5 million elements. The flow field was solved using an unsteady Reynolds-Averaged Navier-Stokes (RANS) numerical method in conjunction with a chimera domain decomposition approach with overset grids. The riser was also discretized into 250 segments. Its motion was predicted through a tensioned beam motion equation with structural damping. The external force terms were obtained by integrating viscous and pressure loads on the riser surface. We then processed the critical parameters including riser VIV a/D, vorticity contours, response histories and spectra, and VIV-induced fatigue. Finally, comparisons were made to the experimental data and conclusions drawn. In general the VIV simulation results agree well with the experimental data. It is concluded that the present CFD approach is able to simulate the vertical riser VIV in sheared current. In addition, it can also predict the VIV-induced fatigue damage.
机译：本文使用数值模拟研究了剪切电流下的立式立管VIV，并给出了结果和与已发布的实验数据的比较。立管由9.63米的黄铜管制成，外径为0.02 m（L / D = 482），质量比为1.75。在实验中，立管倾斜放置，最大拉力为817N，并在其两端固定在测试台上。旋转波箱中的钻机将模拟剪切电流。在我们的数值模拟中，我们将立管的末端固定在地面上，并施加了线性剪切的远场输入电流。使用150万个元素离散化了立管及其周围的流体。使用非稳态的雷诺平均Navier-Stokes（RANS）数值方法，结合带有重叠网格的嵌合域分解方法，求解了流场。冒口也离散为250个部分。通过具有结构阻尼的张紧梁运动方程预测了其运动。外力项是通过将立管表面上的粘性和压力载荷积分而获得的。然后，我们处理了关键参数，包括立管VIV a / D，涡度轮廓，响应历史和频谱以及VIV引起的疲劳。最后，对实验数据和得出的结论进行了比较。通常，VIV仿真结果与实验数据吻合良好。结论是，当前的CFD方法能够在剪切电流中模拟垂直立管VIV。此外，它还可以预测VIV引起的疲劳损伤。

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