Wake dynamics of two side-by-side rectangular cylinders

IF 3 3区工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Fluids Pub Date : 2025-06-18 DOI:10.1016/j.compfluid.2025.106734

Dayu Zhu, Hongshan Lin, Yuan Ma, Renjie Jiang

{"title":"Wake dynamics of two side-by-side rectangular cylinders","authors":"Dayu Zhu, Hongshan Lin, Yuan Ma, Renjie Jiang","doi":"10.1016/j.compfluid.2025.106734","DOIUrl":null,"url":null,"abstract":"<div><div>Flows around two side-by-side rectangular cylinders are researched via a lattice Boltzmann method. The effects of the side ratio (<em>γ</em> = 1/2, 1/4 and 1/8), gap ratio (<em>g</em>* = 0.2–3.0) and Reynolds number (<em>Re</em> = 10–160) on the wake structure, vortex shedding frequency and fluid force on the cylinder surface are investigated. A total of nine distinct coupled vortex wake modes involving the single bluff-body, flip-flopping, in-phase synchronized, anti-phase synchronized, deflected, steady and three transition modes are observed. In the flip-flopping mode, deflected mode and transition mode 1, the vortex shedding frequencies and fluid forces of two cylinders are typically separated, whereas they are always equal in the other modes. The wake transition process is dependent on the side ratio, gap ratio and Reynolds number and the transition mode 1 between the in-phase synchronized and anti-phase synchronized modes can only occur at low side ratio due to the vortex interference. The mechanisms for the observed phenomena have also been analysed based on the frequency spectrum of lift coefficient.</div></div>","PeriodicalId":287,"journal":{"name":"Computers & Fluids","volume":"299 ","pages":"Article 106734"},"PeriodicalIF":3.0000,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Computers & Fluids","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S004579302500194X","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS","Score":null,"Total":0}

引用次数: 0

Abstract

Flows around two side-by-side rectangular cylinders are researched via a lattice Boltzmann method. The effects of the side ratio (γ = 1/2, 1/4 and 1/8), gap ratio (g* = 0.2–3.0) and Reynolds number (Re = 10–160) on the wake structure, vortex shedding frequency and fluid force on the cylinder surface are investigated. A total of nine distinct coupled vortex wake modes involving the single bluff-body, flip-flopping, in-phase synchronized, anti-phase synchronized, deflected, steady and three transition modes are observed. In the flip-flopping mode, deflected mode and transition mode 1, the vortex shedding frequencies and fluid forces of two cylinders are typically separated, whereas they are always equal in the other modes. The wake transition process is dependent on the side ratio, gap ratio and Reynolds number and the transition mode 1 between the in-phase synchronized and anti-phase synchronized modes can only occur at low side ratio due to the vortex interference. The mechanisms for the observed phenomena have also been analysed based on the frequency spectrum of lift coefficient.

查看原文本刊更多论文

两个并排矩形圆柱体的尾迹动力学

采用晶格玻尔兹曼方法研究了两个并排的矩形圆柱体的流动。研究了侧比（γ = 1/2、1/4和1/8）、间隙比（g* = 0.2 ~ 3.0）和雷诺数（Re = 10 ~ 160）对尾迹结构、旋涡脱落频率和圆柱表面流体力的影响。共观察到9种不同的耦合涡尾流模式，包括单崖体、翻转、同相同步、反相同步、偏转、稳定和3种过渡模式。在翻转模式、偏转模式和过渡模式1中，两缸的涡脱落频率和流体力通常是分开的，而在其他模式下，它们总是相等的。尾迹过渡过程依赖于侧比、间隙比和雷诺数，而同相同步和反相同步模式之间的过渡模式1由于涡干扰只能在低侧比下发生。根据升力系数的频谱分析了观测到的现象的机理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Computers & Fluids 物理-计算机：跨学科应用

CiteScore

5.30

自引率

7.10%

发文量

242

审稿时长

10.8 months

期刊介绍： Computers & Fluids is multidisciplinary. The term ''fluid'' is interpreted in the broadest sense. Hydro- and aerodynamics, high-speed and physical gas dynamics, turbulence and flow stability, multiphase flow, rheology, tribology and fluid-structure interaction are all of interest, provided that computer technique plays a significant role in the associated studies or design methodology.