Controlling vortex induced vibrations of cylindrical structures placed near a plane boundary

控制平面边界附近圆柱形结构的涡激振动

• 批准号: RGPIN-2016-04079
• 负责人: Morton, Chris
• 金额: $ 1.75万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=614826
• 关键词: Controlling; vortex; induced; vibrations; cylindrical

This proposal focuses on understanding and controlling vortex induced vibrations (VIV) from circular cylinders placed near a plane boundary. The two direct applications of this research are: (i) maintaining the integrity of civil structures and mechanical engineering devices which may undergo VIV in a cross-flow environment, and (ii) the harvesting of hydrokinetic fluid energy from rivers and ocean currents using VIV. The long term objective of this research program (10+ years), is to elucidate the flow physics associated with the VIV of circular cylinders placed near a plane boundary with application to developing omni-directional passive flow control devices capable of either enhancing or suppressing VIV. The program vision is to establish a thorough and fundamental understanding of vortex shedding and VIV via a mix of theoretical analysis and experimental testing. The research program can be divided into two phases. Phase I will be focused on understanding the vortex shedding and VIV of circular cylinders placed near a plane boundary by relating the relevant flow field, geometrical, and model parameters to the associated pressure field, frequency of vortex shedding, and VIV regimes. The governing dimensionless parameters will be varied parametrically and the importance of three-dimensional phenomena, such as the effect of model aspect ratio and end effects on the vortex formation process will be explored. Phase II research is targeted towards topic-specific questions in vortex shedding and VIV. In particular, the goal is to explain the fundamental flow physics associated with passive control of vortex shedding and VIV, and find optimal performance criteria to either maximize energy extraction or minimize structural fatigue. The significant experimental component of the research program will be carried out in the applicants operational research water tunnel facility equipped with state-of-the-art flow diagnostic equipment (Particle Image Velocimetry, Laser Doppler Velocimetry, and force sensors). Prospective HQP will receive unique practical and theoretical knowledge related to flow modeling, experimental methods, uncertainty analysis, flow-induced vibrations, and energy transfer between moving fluids and compliant structures. These skills are transferable to industry applications in Canada, e.g., renewable energy and civil/offshore structure design. The research program will contribute fundamental insights into the vortex shedding and vortex induced vibrations of circular cylinders placed near a plane boundary, and have a significant impact on the design of alternative energy harvesting devices and engineering structures in targeted applications.

该提案的重点是理解和控制平面边界附近的圆柱体产生的涡激振动 (VIV)。这项研究的两个直接应用是：(i) 保持可能在错流环境中经历 VIV 的土木结构和机械工程设备的完整性，以及 (ii) 使用 VIV 从河流和洋流中收集流体动力流体能量。该研究计划的长期目标（10 年以上）是阐明与放置在平面边界附近的圆柱体的 VIV 相关的流动物理学，并应用于开发能够增强或抑制 VIV 的全向被动流量控制装置。该项目的愿景是通过理论分析和实验测试相结合，建立对涡流脱落和 VIV 的彻底和基本的理解。研究计划可分为两个阶段。第一阶段将重点通过将相关流场、几何和模型参数与相关压力场、涡旋脱落频率和 VIV 状态联系起来，了解平面边界附近圆柱体的涡旋脱落和 VIV。控制无量纲参数将发生参数变化，并将探讨三维现象的重要性，例如模型纵横比的影响和末端效应对涡流形成过程的影响。第二阶段研究针对涡旋脱落和 VIV 领域的特定主题问题。特别是，目标是解释与涡旋脱落和 VIV 被动控制相关的基本流动物理学，并找到最佳性能标准，以最大限度地提高能量提取或最大限度地减少结构疲劳。该研究计划的重要实验部分将在申请人的运筹学水洞设施中进行，该设施配备了最先进的流量诊断设备（粒子图像测速仪、激光多普勒测速仪和力传感器）。未来的 HQP 将获得与流动建模、实验方法、不确定性分析、流动引起的振动以及运动流体和顺应结构之间的能量传递相关的独特的实践和理论知识。这些技能可转移到加拿大的行业应用，例如可再生能源和土木/海上结构设计。 该研究项目将为平面边界附近的圆柱体的涡旋脱落和涡旋引起的振动提供基本见解，并对目标应用中替代能量收集装置和工程结构的设计产生重大影响。