Fluid-solid interaction simulations of an aeroelastic square prism in sinusoidal oscillatory flows

IF 3.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Journal of Fluids and Structures Pub Date : 2024-03-15 DOI:10.1016/j.jfluidstructs.2024.104104

Bin Lu , Qiusheng Li , Xuliang Han , Xincong Wang

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引用次数: 0

Abstract

This study numerically investigates the aerodynamic and aeroelastic characteristics of a square prism (aeroelastic model) and wind field around it in sinusoidal oscillatory flows (SOFs). The reliability of the fluid-solid interaction (FSI) simulation is validated by a free vibration test and wind tunnel tests in smooth flow and SOF. The effects of the amplitude and frequency of SOFs are studied at the mean wind speed of vortex-induced resonance. The results show that increasing the amplitude and frequency of SOFs will amplify the root mean square (RMS) along-wind and across-wind base shear forces of the aeroelastic model but decrease the RMS across-wind displacement at the top of the aeroelastic model. The spectral analysis of the base shear forces indicates that the influence of vortex shedding on the across-wind base shear force is reduced by either increasing the amplitude or increasing the frequency of SOFs. The mean and instantaneous wind fields around the aeroelastic model in SOFs and smooth flow are compared, and the wake characteristics of the aeroelastic model in SOFs are analysed by dynamic mode decomposition. It is observed that when the frequency of SOFs is 1.5 times as large as the fundamental natural frequency of the aeroelastic model, the regular vortex shedding process is substantially affected.

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正弦振动流中气动弹性方棱柱的流固相互作用模拟

本研究对正弦振荡流（SOFs）中方形棱柱（气动弹性模型）及其周围风场的气动和气动弹性特性进行了数值研究。流固耦合（FSI）模拟的可靠性通过自由振动试验和风洞试验进行了验证。在涡流引起共振的平均风速下，研究了 SOF 的振幅和频率的影响。结果表明，增加 SOFs 的振幅和频率会放大气动弹性模型的沿风和跨风基底剪切力均方根值，但会减小气动弹性模型顶部的跨风位移均方根值。基底剪切力的频谱分析表明，通过增加 SOFs 的振幅或频率，可以减小涡流脱落对跨风基底剪切力的影响。比较了 SOFs 和平滑流中气动弹性模型周围的平均风场和瞬时风场，并通过动模分解分析了 SOFs 中气动弹性模型的尾流特性。结果表明，当 SOFs 的频率是气动弹性模型基本固有频率的 1.5 倍时，有规律的涡流脱落过程会受到很大影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Fluids and Structures 工程技术-工程：机械

CiteScore

6.90

自引率

8.30%

发文量

173

审稿时长

65 days

期刊介绍： The Journal of Fluids and Structures serves as a focal point and a forum for the exchange of ideas, for the many kinds of specialists and practitioners concerned with fluid–structure interactions and the dynamics of systems related thereto, in any field. One of its aims is to foster the cross–fertilization of ideas, methods and techniques in the various disciplines involved. The journal publishes papers that present original and significant contributions on all aspects of the mechanical interactions between fluids and solids, regardless of scale.