论文标题

限制对层流状态下旋转椭圆缸的流动的影响

Effect of confinement on flow around a rotating elliptic cylinder in laminar flow regime

论文作者

Gupta, Prateek, Panda, Sibasish, Sahu, Akhilesh Kumar, Kumar, Deepak

论文摘要

数值研究了通道中旋转椭圆缸周围的流动现象。限制参数βis的值分别随\ frac {1} {k}而变化,其中k = 2、4、6和8,以演示下游唤醒中圆柱体周围的涡流式模式。非二维旋转速率αT的值将0.5、1和2作为其值。此外,基于气缸直径的雷诺数(\ textit {re})分别为50、100和150。进行了一项参数研究,以解释阻力系数\ textIt {(c_ {d})}的变化,提升系数\ textIt {(c_ {l})}和矩系数\ textIt {(c_ {m})},并带有β,α,α和textit}。提出了时间周期性升力信号的快速变换(FFT),以了解脱落频率特征,并分析\ textIt {c_ {m}}值以进行自动旋转。尽管引入了明显的限制和气缸旋转,但未观察到对所考虑的参数空间的涡流脱落的完全抑制。观察到自动旋转,并随着非二维旋转速率的降低以及限制和雷诺数的增加而变得突出。

The flow phenomena around a rotating elliptic cylinder in a channel is studied numerically. The value of the confinement parameter βis varied as \frac{1}{k}, where k = 2, 4, 6, and 8 respectively, to demonstrate the vortex-shedding patterns around the cylinder in the downstream wake. The non-dimensional rotation rate αtakes up 0.5, 1, and 2 as its value. Additionally, the Reynolds number (\textit{Re}) based on the cylinder diameter is taken to be 50, 100, and 150 respectively. A parametric study is performed to explain the changes in drag coefficient \textit{(C_{D})}, lift coefficient \textit{(C_{L})}, and moment coefficient \textit{(C_{M})} with variations of β, α, and \textit{Re}. The Fast-Fourier transform (FFT) of the time-periodic lift signals is presented to understand the shedding frequency characteristics, and the \textit{C_{M}} values are analyzed for cases of autorotation. Despite the introduction of significant confinement and cylinder rotation, complete suppression of vortex shedding is not observed for the considered parameter space. Autorotation is observed and becomes prominent with decrease in non-dimensional rotation rate and increase in confinement and Reynolds number.

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