Flow-induced vibration of non-ideal, flexible beam-like structures

加拿大采矿和能源行业迫切需要获得更可靠的工具来模拟“非理想”或“真实”圆柱形结构与流体流动之间的相互作用，这激发了目前的计划。现有的方法和工具缺乏考虑缺陷和组合流激振动（FIV）模式的影响，这是许多实际流体-结构系统的两个重要方面。现有文献暗示了这种系统的全局动力学和稳定性对缺陷的敏感性，以及由于组合FIV模式而发生的放大振幅振动和混沌运动。我们将采用分析和计算方法来发现导致组合FIV模式的物理机制（例如组合自激和涡激振动），并模拟缺陷的影响，例如松散的末端支撑和身体的初始曲率。这些基础研究将成为新的FSI建模方法和工具（包括开源软件包）的基石，这些方法和工具将用于设计无故障的现实工程系统，如钻井立管和系绳风筝。

The present program is motivated by the Canadian mining and energy industries' pressing needs to access more reliable tools for modelling interactions between 'non-ideal' or 'real' cylindrical structures and fluid flow. The existing methods and tools lack considering the effects of imperfections and combined flow-induced vibration (FIV) modes -- two important aspects of many real fluid-structure systems. The existing literature hints the sensitivity of the global dynamics and stability of such systems to imperfections, as well as the occurrence of amplified-amplitude vibrations and chaotic motions due to combined FIV modes. We will take analytical and computational approaches to discover physical mechanisms leading to combined FIV modes (e.g. combined self-excited and vortex-induced vibrations) and to model the effects of imperfections, such as loose end-supports and body's initial curvature. These fundamental studies will be the cornerstone of the new FSI modelling methods and tools, including open-source software packages, that will be used to design trouble-free real-world engineering systems, such as drilling risers and tethered kites.