圆筒形尾流中薄膜飘动的模式转换

Fan Duan, Jinjun Wang
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引用次数: 0

摘要

作为研究流固耦合的一个代表性模型,柔性薄膜与圆柱体尾流的相互作用涉及固体运动和流体演变的复杂模式。最近的研究发现,实验中的相互作用既可以是周期性的,也可以是非周期性的;但后者往往被忽视。在这项工作中,我们通过实验研究了圆形圆柱体后面的柔性薄膜的不规则非周期性飘动。实验结果表明,不规则飘动间歇性地表现出瞬态准周期模式和非周期性模式。前者伴随着在薄膜表面交替形成的大尺度漩涡,而后者则与薄膜后缘下游形成的漩涡有关,因此整个薄膜都被扩展的剪切层所包围。为了从整个数据集中单独分离出与这两种模式相关的数据,提出了一种运动模式识别方法,然后实现了流场的条件统计。准周期模式对应于尾流中更强烈的速度波动,而在非周期性模式中,观测到的剪切层局部不稳定性导致了局部流向速度波动的增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mode transition of a film fluttering in a circular cylinder wake
As a representative model in the investigation into fluid–structure coupling, a flexible film interacting with the wake of a circular cylinder involves intricate patterns of both solid motion and fluid evolution. Recent investigations have found that the interactions could be either periodic or aperiodic in experiments; the latter, however, is often overlooked. In this work, the irregular aperiodic flutter of a flexible film behind a circular cylinder is investigated experimentally. It is determined that the irregular flutter intermittently exhibits transient quasi-periodic mode and aperiodic mode. The former is accompanied by the large-scale vortices alternatively formed against the film surfaces, while the latter is associated with vortices formed downstream of the film's trailing edge, so that the whole film is enveloped by the extended shear layers. In order to separate the data individually pertaining to each of the two modes from the whole dataset, a motion-mode recognition method is proposed, and then conditional statistics of flow fields are achieved. The quasi-periodic mode corresponds to more intense velocity fluctuations in the wake, while in the aperiodic mode, the observed localized instability of shear layers induces an increase in the local streamwise velocity fluctuation.
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