摘要
通过对比原型与模型的数值模拟结果,评价了利用雷诺相似准则研究圆柱涡激振动响应的适用性。结构的质量比为2.6,阻尼比为0.005,长度比尺取10。在雷诺数Re=5000,约化速度为2~14范围内,对比了原型与模型的水动力系数、量纲一振幅及尾流结构。研究结果表明:原型和模型的振动响应完全相似,升力系数的均方根、时均阻力系数、量纲一振幅相等,不同涡识别准则得到的瞬时三维涡结构基本相似。根据Liutex准则量化了旋涡的绝对强度,其随约化速度先增加后减小,与升力系数的均方根变化趋势一致。尽管三维涡结构的空间分布有差异,原型和模型的旋涡形成长度和尾迹宽度沿展向的变化略有不同,但原型和模型的量纲一旋涡强度相等,因此振动响应相似。
This paper numerically evaluates the applicability of Reynolds similarity criterion on the investigation of vortex-induced vibration of a circular cylinder through the comparison of numerical simulation results between prototype and model.The mass ratio and damping ratio of cylinder is 2.6 and 0.005,respectively.The length scaled ratio is selected as 10.The simulations were conducted in a fixed Reynolds number of 5000 in the reduced velocity range of 2~14.The hydrodynamic coefficients and vibration response as well as the wake flow structures are compered.Numerical results indicate that the vibration response of prototype and scaled model are completely similar,where the root-mean-squared(RMS)lift coefficient,time-averaged drag coefficient and non-dimensional amplitudes are equal.The instantaneous three-dimensional vortex structures are basically similar via different vortex identification methods.The absolute strength of vortices is measured according to the Liutex/Rortex identification method,which first increases and then decreases with reduced velocity.It is consisted with the variation of RMS lift coefficiebt.Although the spatial difference of three-dimensional vortex structure,the vortex formation length and wake width of prototype and scaled model vary differently along the span.The equal strength of vortices is the main reason for the vibration similarity.
作者
朱红钧
李英媚
ZHU Hongjun;LI Yingmei(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)
出处
《中国造船》
北大核心
2025年第5期149-164,共16页
Shipbuilding of China
基金
国家自然科学基金项目(52301338)
四川省杰出青年科学基金项目(2023NSFSC1953)。
关键词
雷诺相似准则
涡激振动
流场结构
流固耦合
Reynolds similarity criterion
vortex-induced vibration
wake structure
fluid-structure interaction
