Abstract In general, motion-induced vortex vibration is considered to be caused by the unification of the separated vortex from leading edge and the secondary vortex at trailing edge. However, the results of previous wind tunnel tests for rectangular cross sections with side ratios of B/D ​= ​2, 4, 6 (B: along-wind length, D: cross-wind length) reveal that in the heaving mode, the secondary vortex at trailing edge is not always essential for the generation of motion-induced vibration, but can be relevant to the magnitude of the exciting force acting on the model. In this study, flow visualization tests by smoke wire method under forced vibration conditions and spring-supported tests by free vibration method were conducted. The emphasis of this study is placed on clarifying the effect of the secondary vortex at trailing edge on response characteristics of motion-induced vortex vibration in the torsional mode for rectangular cross sections. As a result, the stable shedding of the secondary vortex at trailing edge is not a necessary condition for the generation of motion-induced vortex vibration in the torsional mode, but the secondary vortex at trailing edge can be relevant to the magnitude of the exciting moment acting on the model.

中文翻译：

---

后缘二次涡对扭转模态运动激涡振动响应特性影响的实验研究

摘要 通常，运动诱发涡振动被认为是由前缘分离涡和后缘次级涡统一引起的。然而，之前对边比为 B/D = 2, 4, 6（B：顺风长度，D：横向风长度）的矩形截面风洞试验结果表明，在垂荡模式下，后缘的次级涡旋对于产生运动引起的振动并不总是必不可少的，但可能与作用在模型上的激振力的大小有关。在这项研究中，进行了强制振动条件下烟丝法的流动可视化测试和自由振动法的弹簧支撑测试。本研究的重点是阐明后缘次级涡对矩形截面扭转模态运动诱发涡振动响应特性的影响。因此，后缘次级涡的稳定脱落不是扭转模态运动诱发涡振动产生的必要条件，但后缘次级涡可能与激振力矩的大小有关。作用于模型。