具有对称强迫的流体弹球显示出稳定、周期、准周期和混沌动力学特性

IF 2.2 3区 工程技术 Q2 MECHANICS Theoretical and Computational Fluid Dynamics Pub Date : 2024-05-01 DOI:10.1007/s00162-024-00693-2
Yanting Liu, Nan Deng, Bernd R. Noack, Xin Wang
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引用次数: 0

摘要

摘要 我们对对称强迫下的流体弹球进行了数值研究,发现了不同旋转速度下的七种流动状态。流体弹球由三个可旋转的圆柱体组成,圆柱体位于等边三角形的顶点,指向匀速来流的上游。起点是雷诺数 Re = 100 时基于圆柱体直径的非受力非对称周期性涡流脱落。通过以恒定速度 |b| 旋转两个后气缸,使气流在两个方向上的速度均达到来流速度的三倍,从而对称地驱动气流。底部圆筒的逆时针(b >0)和顺时针(b <0)旋转分别对应于船尾和船底出血。共观察到七种不同的流态,包括稳定流、三种对称/非对称周期类型的脱落、两种对称/非对称准周期行为和一种混沌动力学。涡流脱落具有多种耦合振荡器模式,包括同相、反相、失相同步和非同步。利用空气动力的时间演变和尾流的动力学模式分解分析了这些脱落状态。非受迫和受迫动力学万花筒促使流体弹球成为具有挑战性的建模和控制基准。
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The fluidic pinball with symmetric forcing displays steady, periodic, quasi-periodic, and chaotic dynamics

We numerically investigate the fluidic pinball under symmetric forcing and find seven flow regimes under different rotation speeds. The fluidic pinball consists of three rotatable cylinders placed at the vertices of an equilateral triangle pointing upstream in a uniform oncoming flow. The starting point is the unforced asymmetric periodic vortex shedding at Reynolds number Re = 100 based on the cylinder diameter. The flow is symmetrically actuated by rotating the two rear cylinders at constant speed |b| up to three times the oncoming velocity in both directions. Counterclockwise (b > 0) and clockwise (b < 0) rotation of the bottom cylinder correspond to boat tailing and base bleeding, respectively. A total of seven distinct flow regimes are observed, including a steady flow, three symmetric/asymmetric periodic types of shedding, two symmetric/asymmetric quasi-periodic behaviors, and a chaotic dynamics. The vortex shedding features multiple coupled oscillator modes, including in-phase, anti-phase, and out-of-phase synchronization and non-synchronization. These shedding regimes are analyzed employing the temporal evolution of the aerodynamic forces and a dynamical mode decomposition of the wake flow. The kaleidoscope of unforced and forced dynamics promotes the fluidic pinball as a challenging modeling and control benchmark.

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来源期刊
CiteScore
5.80
自引率
2.90%
发文量
38
审稿时长
>12 weeks
期刊介绍: Theoretical and Computational Fluid Dynamics provides a forum for the cross fertilization of ideas, tools and techniques across all disciplines in which fluid flow plays a role. The focus is on aspects of fluid dynamics where theory and computation are used to provide insights and data upon which solid physical understanding is revealed. We seek research papers, invited review articles, brief communications, letters and comments addressing flow phenomena of relevance to aeronautical, geophysical, environmental, material, mechanical and life sciences. Papers of a purely algorithmic, experimental or engineering application nature, and papers without significant new physical insights, are outside the scope of this journal. For computational work, authors are responsible for ensuring that any artifacts of discretization and/or implementation are sufficiently controlled such that the numerical results unambiguously support the conclusions drawn. Where appropriate, and to the extent possible, such papers should either include or reference supporting documentation in the form of verification and validation studies.
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