Spar平台在来流作用下极易发生涡激运动，造成疲劳损坏。采用计算流体力学（CFD）方法，探究螺旋侧板对Spar平台水动力特性的影响。首先通过原型平台绕流分析验证模拟方法的可靠性，然后分析不同厚度及不同迎流角度时水动力参数的变化。结果表明：螺旋侧板可有效抑制涡激运动，使平台总体受力减小；在研究范围内，螺旋侧板厚度为0.10D（D为平台直径）时，对涡激运动的抑制效果最为显著；迎流角度在一定程度上会影响抑涡效果，在研究范围内b截面的拖曳力系数和升力系数均为最小值，抑涡效果最为理想

Spar platforms could be subjected to Vortex-Induced Motions (VIM) in certain flow conditions, which cause fatigue damage earlier. The Computational Fluid Dynamics (CFD) is adopted to investigate how helical strakes affect the hydrodynamics of Spar platform. Numerical simulation of flows about a bare platform is given to verify the method first. Then numerical analysis is also carried for the Spar platform with different thickness helical strakes and under different angle of incoming flow. By analyzing the change of hydrodynamics, it is found that the helical strakes are effective in restraining the VIM, and reduce the overall force of the platforms. In the research range, the effectiveness of inhibiting VIM is most evident when the thickness is 0.10D(D is dimension of the Spar). Furthermore, the suppressing efficiency is also affected by angle of incoming flow. The drag coefficient and lift coefficient are the least at b section, where suppression effect is the best within the scope.

TK83

国家自然科学基金资助项目（51676131）；上海市科委项目资助（13DZ2260900）