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Numerical simulation on the forced oscillation of rigid riser with helical strakes in different section shapes

机译：截面螺旋形刚性冒口强迫振动的数值模拟

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In order to study the helical strakes' suppression effects on the vibration riser, triangle and circular sections helical strakes are proposed. With the technology of dynamic mesh, forced oscillation in steady flow of the riser with helical strakes in different cross-section shapes at low Reynolds number are numerically simulated. The analysis is focused on the lock-in range, as well as the force status and trailing vortex structure under different values of amplitude (A) and oscillation frequency (f(e)), and draw comparisons to the bare riser's results. Research shows the lock-in range will increase with the increase of amplitude ratio (A/D), the riser with all three different shaped helical strakes have larger lock-in range than bare riser. Before entering into the lock-in region, riser with different shaped helical strakes all have good effects on suppressing the vibrations of riser. Within and after lock-in region, riser with triangle and circular sections helical strakes have smaller lift force than that with rectangular section, which reduced lift coefficient by 65.83% and 83.53%. The trailing vortex structures of the riser with helical strakes are in strength three-dimensional character. Inside the lock-in region, riser with triangle and circular sections have better suppression effect than that with rectangular section. Outside the lock-in region, riser with triangle section helical strakes has the best vortex suppression effect, of which the influence on the flow field is greatest and the vortex-induced force is least.
机译：为了研究螺旋纹对减振器的抑制作用，提出了三角形和圆形截面的螺旋纹。采用动态网格技术，对低雷诺数下具有不同横截面形状的螺旋纹的冒口的稳态流动中的强迫振荡进行了数值模拟。分析的重点是锁定范围，以及振幅（A）和振荡频率（f（e））不同值下的力状态和尾涡结构，并与裸管的结果进行比较。研究表明，锁定幅度将随振幅比（A / D）的增加而增加，具有三种不同形状的螺旋形波纹的立管的锁定范围要比裸立管大。在进入锁定区域之前，具有不同形状的螺旋纹的立管都具有良好的抑制立管振动的效果。在锁定区域内和锁定区域之后，具有三角形和圆形截面螺旋纹的立管具有比具有矩形截面的立管小的提升力，从而将提升系数降低了65.83％和83.53％。具有螺旋形波纹的立管的尾部涡结构具有强度三维特征。在锁定区域内部，三角形和圆形截面的立管比矩形截面的立管具有更好的抑制效果。在锁定区域之外，具有三角形截面螺旋形波纹的冒口具有最佳的涡流抑制效果，其中对流场的影响最大，而涡流诱导的力最小。

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