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首页> 外文期刊>Journal of Fluid Mechanics >Stability analysis of experimental flow fields behind a porous cylinder for the investigation of the large-scale wake vortices
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Stability analysis of experimental flow fields behind a porous cylinder for the investigation of the large-scale wake vortices

机译：用于研究大型尾流涡流的多孔圆柱体后面的实验流场的稳定性分析

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摘要

When the linear stability analysis is applied to the time-averaged flow past a circular cylinder after the primary instability of the wake, a nearly marginally stable global mode is predicted with a frequency in time equal to that of the saturated vortex shedding. This behaviour has recently been shown to hold up to Reynolds number Re = 600 by direct numerical simulations. In the present work we verify that the global stability analysis provides reasonable estimation also when applied to experimental velocity fields measured in the wake past a porous circular cylinder at re?3.5 ×10 ~3. Different intensities of continuous suction and blowing through the entire surface of the cylinder are considered. The global direct and adjoint stability modes, derived from the experimental data, are used to sort the random instantaneous snapshots of the velocity field in phase. The proposed method is remarkable, sorting the snapshots in phase with respect to the vortex shedding, allowing phase-averaged velocity fields to be extracted from the experimental database. The phase-averaged flow fields are analysed in order to study the effect of the transpiration on the kinematical characteristics of the large-scale wake vortices.
机译：在尾流的主要不稳定性之后，将线性稳定性分析应用于经过圆柱体的时间平均流量时，可以预测出一个近似于边际稳定的全局模态，其时间频率等于饱和涡旋脱落的频率。通过直接数值模拟，最近已证明该行为可保持雷诺数Re = 600。在目前的工作中，我们验证了将整体稳定性分析提供给合理的估计，当将其应用到在re？3.5×10〜3时经过多孔圆柱体的尾流中测量的实验速度场时，也可以提供合理的估计。考虑了通过汽缸整个表面的不同强度的连续抽吸和吹气。从实验数据得出的整体直接和伴随稳定模式用于对速度场的随机瞬时快照进行分类。所提出的方法非常出色，相对于涡旋脱落对快照进行了相序排序，从而可以从实验数据库中提取相平均速度场。分析相平均流场，以研究蒸腾作用对大型尾流涡流运动学特性的影响。

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