海洋柔性结构涡激振动的流固耦合机理和响应

Fluid-solid coupling and dynamic response of vortex-induced vibration of slender ocean cylinders

对近几十年来国内外在涡激振动的基础研究包括机理认识和动响应分析等方面的进展进行了论述,尤其针对海洋油气平台中的立管、隔水管等细长柔性结构的涡激振动.描述了涡激振动这种典型的非线性流固耦合现象所具有的特征,包括自激、自限制、展向相关、尾迹水动力与结构动力的流固耦合等及其主要影响参数.介绍了目前常用的结构响应预测方法和相关实验.通过讨论当前理论研究和实际工程中的热点问题,诸如多模态宽带振动、浮体运动与水下立管的耦合、响应抑制措施、双向振动、高雷诺数下的大尺度物理实验等,对今后该领域的研究方向进行了力所能及的展望.

We review some recent developments on the mechanism and response analysis of vortex-induced vibration （VIV） of flexible cylinders, particularly the slender risers in deep water. Main characters of VIV, such as self-excitation, self-limitation, span coherence and fluid-solid coupling, along with principal influence factors are presented. Various prediction approaches, including empirical and numerical ones, and experiments are introduced. Then we give perspectives on some challenging issues, e.g., multi-mode and wide-band VIV, dynamic interaction between top-end motion and submarine riser, VIV suppression, CF （cross flow） and IL （in line） motion and large scale experiment at high Reynolds number.