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首页> 外文期刊>Transactions of the Japan society for aeronautical and space sciences >The Early Stage of Development of the Wake behind a Circular Cylinder Impulsively Started into Rotatory and Rectilinear Motion
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The Early Stage of Development of the Wake behind a Circular Cylinder Impulsively Started into Rotatory and Rectilinear Motion

机译：圆形圆柱后面的尾流冲动的发展早期，开始进入旋转运动和直线运动

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摘要

The early stage of development of a two-dimensional viscous incompressible flow generated by a circular cylinder impulsively starting both rotatory and rectilinear motion is studied computationally. This study is based on numerical solutions of the two-dimensional unsteady Navier-Stokes equations. The Reynolds number, Re, ranges from 200 to 10~4 while the rotatory-to-rectilinear speed ratio, α, is increased from 0.5 to 8.0. The object of the study is to examine the effect of increase of rotation on the flow structure. Important changes in flow field take place as the speed ratio α increases, and some features not appearing in the previous work, especially with regard to the evolution of initial vortex structure in the near wake of the cylinder. It is found that some basic patterns of vortex shedding at the initial stage can be identified according to our calculated results.
机译：计算研究了由圆柱体产生的二维粘性不可压缩流的发展的早期阶段，该圆柱体脉冲地启动旋转运动和直线运动。本研究基于二维非定常Navier-Stokes方程的数值解。雷诺数Re的范围从200到10〜4，而旋转直线速度的比率α从0.5增大到8.0。该研究的目的是研究旋转增加对流动结构的影响。随着速度比α的增加，流场发生了重要变化，并且在以前的工作中没有出现某些特征，特别是在圆柱体近尾时初始涡旋结构的演变方面。我们发现，根据我们的计算结果，可以确定初始阶段涡流脱落的一些基本模式。

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