This paper focuses on the flow dynamics associated with uniform flow past an oscillating cylinder using a 2D Computational Fluid Dynamics (CFD) approach. The simulations were carried out using the Reynolds-Averaged Navier-Stokes (RANS) k-w turbulence model. The numerical model has been validated with experimental data to ensure accuracy of the results. The results were examined for Re= 10,000 and a fixed motion amplitude ratio of A/D=0.3 and the frequencies of the oscillations were varied in the vicinity of the Strouhal frequency of a fixed cylinder in a free stream. It is noted that a phase switch of the vortex formation will occur as the frequency of the oscillation passes through the Strouhal cylinder frequency. This transition is characterized by a jump in the in-phase and out-of-phase with the velocity components of the forces. The results were examined by analyzing the transfer of energy either from the fluid to the structure or vice versa to quantify the jump in the force components. In the lock-in region, a limit cycle of the cylinder motion and the lift force will form. The energy transfer is then related to the traverse direction of the limit cycle.
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机译：本文重点介绍了使用2D计算流体力学（CFD）方法与流过摆动缸的均匀流相关的流体动力学。使用雷诺平均Navier-Stokes（RANS）k-w湍流模型进行了仿真。数值模型已经用实验数据进行了验证，以确保结果的准确性。检查结果，Re ＝ 10,000，并且固定运动振幅比为A / D ＝ 0.3，并且振荡的频率在自由流中在固定气缸的斯特劳哈尔频率附近变化。应当注意，随着振荡频率通过斯特劳哈尔气缸频率，将发生涡流形成的相变。这种转变的特征是，力的速度分量同相跳变和异相跳变。通过分析能量从流体到结构的传递或反之亦然来检查结果，以量化力分量的跳跃。在锁定区域中，将形成气缸运动和提升力的极限循环。然后，能量传递与极限循环的运行方向相关。
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