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低雷诺数圆柱绕流中存在着复杂的流动过程,比如,尾迹中涡的发展显然不是理想的轴对称卷绕和扩散的过程.针对上述问题,用场观点和拉各朗日观点分别分析了固定时刻的流场特征和不同时刻的流动过程.首先通过等压线和相对流线的叠加,分析了相邻涡间通道内的流动.其次从涡结构的角度解释了尾迹中流体速度随时间的变化规律,并利用流体在不同时刻受不同流动结构控制的观点解释了染色线多次折回中粒子间的显著间断现象.最后对绕圆柱附近的流动进行了分区界定,分析了其中部分流体的变形情况和运动过程.
For example, the development of vortices in the wake is obviously not an ideal axisymmetric winding and diffusion process.In view of the above problems, the fixed point The characteristics of the flow field at different times and the flow process at different times.Firstly, the flow in the adjacent vortex channels was analyzed by the superposition of the isobaric line and the relative flow line.Secondly, the fluid velocity in the wake was explained from the perspective of vortex structure And using the fluid at different times by different flow structure control point of view to explain the significant discontinuity of the particles in the multiple folds of the particles.Finally, the flow around the cylinder was partitioned to define the part of the fluid deformation Situation and movement process.