论文标题
使用适当的正交分解来调查流动流动缸中流动缸的唤醒结构
Investigating Wake Structures in Flow Past Oscillating Cylinder Using Proper Orthogonal Decomposition
论文作者
论文摘要
本研究调查了过去振荡圆柱体流动中不稳定的唤醒动力学。进行二维计算研究，以使其流过正弦曲线振荡圆柱体。诸如雷诺数，强迫频率，振幅和波长之类的工作参数是系统的变化，并且研究了它们对尾动力学的影响。提起和阻力系数用圆柱位置绘制，以表征流量。此外，使用适当的正交分解（POD）研究了流场。获得时间分辨的涡度轮廓。然后使用POD算法处理这些结果。每种情况下，都可以获得POD模式形状和功率光谱密度（PSD）图。使用POD结果分析唤醒动力学。对气缸振荡的流动响应的特征是POD模式的形状和PSD图中的显性频率峰。可以观察到，在雷诺数的较低值下，流量过于耗散。此外，在实现同步涡流脱落时观察到频率比的影响。还研究了高振幅和较大的波长状态，在先前的研究中仍未探索。
The present study investigates unsteady wake dynamics in flow past oscillating cylinder. Two-dimensional computational study is carried out for flow past sinusoidally oscillating cylinder. Operating parameters like Reynolds number, forcing frequency, amplitude and wavelength are systematically varied and their effect on wake dynamics is investigated. Lift and drag coefficients are plotted with cylinder position to characterize the flow. Further, flow field is investigated using Proper Orthogonal Decomposition (POD). Time-resolved vorticity contours are obtained. These results are then processed using POD algorithm. POD mode shapes and Power Spectral Density (PSD) plots are obtained for each case. Wake dynamics is analyzed using POD results. Flow response to cylinder oscillations is characterized by the POD mode shape and dominant frequency peaks in PSD plots. It is observed that flow is too dissipative at lower values of Reynolds number. Further, effect of frequency ratio is observed in achieving synchronized vortex shedding. High amplitude and large wavelength regime, which remained unexplored in previous research is also investigated.
