Abstract The effects of finite-span computational domain with periodic boundaries for vortex-induced vibration simulations are investigated. Coupled fluid-solid dynamics of an elastically-mounted rigid circular cylinder are performed using detached eddy simulations with four computational domains of different span lengths. Simulations with span less than five-cylinder diameters give erroneous results including, under/overprediction of displacement amplitude, premature lock-in, etc. Spectra of transverse loading and displacement, instantaneous oscillation frequency, and phase lag between transverse force and displacement are analyzed. High spanwise coherence is found to be the primary cause of the artefacts observed in small-span simulations.

中文翻译：

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涡激振动模拟中有限跨度的伪影

摘要 研究了具有周期性边界的有限跨度计算域对涡激振动模拟的影响。弹性安装的刚性圆柱体的流体-固体耦合动力学是使用具有四个不同跨度长度的计算域的分离涡流模拟来执行的。跨度小于五缸直径的模拟给出了错误的结果，包括位移幅度的低估/高估、过早锁定等。分析了横向载荷和位移的频谱、瞬时振荡频率以及横向力和位移之间的相位滞后。发现高跨度相干性是小跨度模拟中观察到的伪影的主要原因。