Suppression of vortex-induced vibrations of a flexible riser by adding helical strakes
Suppression of vortex-induced vibrations of a flexible riser by adding helical strakes
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DOI：
10.1007/s42241-018-0078-6
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发表时间：
2018-08
影响因子：
2.5
通讯作者：
Dongyang Chen;L. Abbas;Guoping Wang;X. Rui;Wei-jie Lu
中科院分区：
文献类型：
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作者：
Dongyang Chen;L. Abbas;Guoping Wang;X. Rui;Wei-jie Lu
对柔性立管进行 3D 计算流体动力学/计算结构动力学 (CFD/CSD) 数值双向耦合模拟，以研究具有和不具有暴露于涡激振动 (VIV) 的螺旋列板的立管的动态响应性能。计算了无螺旋板的 PVC 立管的 VIV 响应，并与实验数据进行了比较，验证了双向耦合方法的准确性。随后，研究了具有不同类型螺旋列板的短 PVC 立管的动态行为。通过一系列模拟获得了沿立管的振动幅度、立管监测点的轨迹和涡脱落轮廓。螺旋列板的 VIV 抑制机制涉及涡流结构的破坏和裸立管涡流脱落频率的降低。此外，将具有合理几何配置（如合适的列板高度、列板节距、起始数和列板覆盖范围）的螺旋列板结构附着在柔性立管上，可以达到良好的抑制效果。在不同的降低速度 (Ur) 下，效果也不同。对于短立管，Ur= 7 时效果显着，横向振动响应减少约 97%。
3-D computational fluid dynamics/ computational structure dynamics (CFD/CSD) numerical two-way coupling simulations are conducted for a flexible rise in order to study the dynamic response performance of the riser with and without helical strakes exposed to the vortex-induced vibration (VIV). The VIV responses of a PVC riser without helical strakes are computed and compared with experimental data, to verify the accuracy of the present two-way coupling method. Subsequently, the dynamic behaviors of a short PVC riser with different kinds of helical strakes are studied. The vibration amplitudes along the riser, the trajectories of the riser’s monitor point and the vortex shedding contours are obtained in a series of simulations. The helical strakes’ VIV suppression mechanisms are found involving the breaking of the vortex structures and the reduction of the vortex shedding frequency of the bare riser. Moreover, a good suppression effect can be achieved by attaching the helical strake structure with a reasonable geometrical configuration (such as the appropriate strake height, strake pitch, the number of starts and strake coverages) to the flexible riser. The effect is also diverse at different reduced velocity (Ur). The remarkable effect is found atUr= 7 for the short riser, with about 97% reduction in the transverse vibration response.