In this study, a fluid-structure interaction solver is employed to explore the flow physics of tandem oscillating square bluff bodies by varying the corner radius. Based on previous research, dynamic behavior, and fluid forces only square and circular bluff bodies are chosen for a supplementary investigation. This study investigates the effects of the streamwise displacement, $1.05\le L_x/D\le 12.0$, of two elastically mounted square and circular bluff bodies in a tandem arrangement. Fluid flows at a Reynolds number of 100 and a fixed mass ratio $m^{\ast }=10$ are used for the upstream and downstream bluff bodies. As the most complex oscillations and wake flows occur adjacent to the approximate natural frequency ratio, thus a constant natural frequency of $F_r=1.0$ is defined. To achieve excellent parallel performance, an immersed boundary lattice Boltzmann method code coupled with a structural equation is developed and accelerated using a graphical processing unit. The results for flow-induced vibrations suggest that the flow response characteristics of the tandem oscillating bluff bodies are strong functions of the streamwise displacement. Four different flow regimes of the bluff body arrangements are identified on the basis of response amplitude. Both the square and circular downstream bluff bodies exhibit two peak transverse amplitudes in the existing scrutinized spacing ratios. In addition, the critical spacing ratio values are dissimilar for the two bluff bodies. Moreover, at the end of the spacing ratio ($L_x/D\ge 10$), the wake effects for the downstream square body are amplified, and it oscillates near a single oscillating circular bluff body. Finally, the flow physics, as well as the hydrodynamic force coefficients of the tandem oscillating bluff bodies are also reviewed.

在这项研究中，采用流固耦合求解器通过改变角半径来探索串联振荡方形钝体的流动物理特性。根据先前的研究，动态行为和流体力仅选择方形​​和圆形钝体进行补充研究。本研究调查了流向位移的影响，$1.05\le {\mathrm{大号}}_X/D\le 12.0$，由两个弹性安装的方形和圆形钝体串联而成。流体以 100 的雷诺数和固定的质量比流动${米}^{*}=10$用于上游和下游钝体。由于最复杂的振荡和尾流发生在近似的自然频率比附近，因此恒定的自然频率为$F_r=1.0$被定义为。为了实现出色的并行性能，使用图形处理单元开发并加速了与结构方程耦合的浸入式边界格子玻尔兹曼方法代码。流动诱发振动的结果表明，串联振荡钝体的流动响应特性是流向位移的强函数。基于响应幅度确定了钝体布置的四种不同流态。方形和圆形下游钝体在现有的检查间距比中都表现出两个峰值横向振幅。此外，两个钝体的临界间距比值不同。此外，在间距比的末尾（${\mathrm{大号}}_X/D\ge 10$)，下游方体的尾流效应被放大，它在单个振荡的圆形钝体附近振荡。最后，还回顾了串联振荡钝体的流动物理学和水动力系数。