Underwater oscillations of rigid plates with H-shaped cross sections: An experimental study to explore their flow physics
Underwater oscillations of rigid plates with H-shaped cross sections: An experimental study to explore their flow physics
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DOI：
10.1063/5.0141889
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发表时间：
2023-03
影响因子：
4.6
通讯作者：
Burak Gulsacan;M. Aureli
中科院分区：
文献类型：
--
作者：
Burak Gulsacan;M. Aureli
在这项工作中，我们对H型截面刚性板在静止的牛顿不可压缩粘性流体环境中的简谐振动问题进行了全面的实验研究。受最新关于横向振动平板流体动力阻尼最小化的研究结果的启发，我们对平板横截面中法兰的存在所产生的流动物理进行了详细的定性和定量的实验研究。具体地说，主要目的是通过初步研究旋涡脱落和对流的动力学，阐明法兰尺寸对流固耦合的各个方面的影响。我们通过识别路径线、旋涡脱落和动力学、独特的流体动力状态和稳定流动，在广泛的振荡幅度、频率和法兰尺寸与宽度比范围内进行粒子图像测速实验。这项工作的基本贡献包括新的流体动力状态相图，展示了法兰比对状态转变的影响，并研究了它们与旋涡-旋涡和旋涡-结构相互作用的定性模式的关系。最后，我们讨论了稳定流动，确定了初级和次级结构作为控制参数的函数。
In this work, we present a comprehensive experimental study on the problem of harmonic oscillations of rigid plates with H-shaped cross sections submerged in a quiescent, Newtonian, incompressible, viscous fluid environment. Motivated by recent results on the minimization of hydrodynamic damping for transversely oscillating flat plates, we conduct a detailed qualitative and quantitative experimental investigation of the flow physics created by the presence of the flanges, that is, the vertical segments in the plate cross section. Specifically, the main goal is to elucidate the effect of flange size on various aspects of fluid–structure interaction, by primarily investigating the dynamics of vortex shedding and convection. We perform particle image velocimetry experiments over a broad range of oscillation amplitudes, frequencies, and flange size-to-width ratios by leveraging the identification of pathlines, vortex shedding and dynamics, distinctive hydrodynamic regimes, and steady streaming. The fundamental contributions of this work include novel hydrodynamic regime phase diagrams demonstrating the effect of flange ratio on regime transitions, and in the investigation of their relation to qualitatively distinct patterns of vortex–vortex and vortex–structure interactions. Finally, we discuss steady streaming, identifying primary, and secondary structures as a function of the governing parameters.