螺旋侧板的高度对VIV影响的CFD分析

深水立管在来流作用下容易产生流向和横向的周期性位移振动(VIV),这种流固耦合作用会加剧立管结构疲劳,最终导致其功能失效。之前的研究发现螺旋侧板可以有效的抑制VIV的影响,其中侧板高度和螺距等几何参数决定其抑制效率。文章主要基于CFD对不同高度螺旋侧板的立管的尾流场进行数值模拟。结果表明:在研究范围内,螺旋侧板随高度增大抑制VIV效果越好,在H=0.25D(D为立管直径)时作用最佳,但拖曳力系数明显增大,同时来流方向和螺旋侧板的夹角也会影响其抑制效率。

CFD analysis on the effectiveness of the height of helical strakes in suppressing VIV

Deepwater riser is the key equipment of ocean petroleum industry, and it will vibrate periodically in the flow and transverse direction under flow, which can aggravate the fatigue damage to the riser and lead to the function failure finally. Previous corresponding research has been done to discover that the helical strakes is able to effectively suppress VIV, besides, many parameters have certain effects on its efficiency in suppressing VIV, including the height, pitch and coverage scale. The main aim of this paper is to study the wake field of a riser with different height by numerical simulation based on the Fluent software. In conclusion, the effectiveness of inhibiting VIV is better with increasing the height of helical strakes, which is most obvious when the height is equal to the diameter of riser, however, the drag coefficient increases obviously meanwhile. Furthermore, the suppressing efficiency is also affected by included angle between flow and helical strakes. The research may be beneficial to the study of suppressing VIV and the design of helical strakes in engineering.