Numerical Analysis on Suppression of Vortex Induced Vibration of a Square Cylinder with Control Rods

Numerical Analysis on Suppression of Vortex Induced Vibration of a Square Cylinder with Control Rods | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Numerical Analysis on Suppression of Vortex Induced Vibration of a Square Cylinder with Control Rods Alvi Ahmmed, Prasanjit Das, Md. Ajwad Mohimin This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7450012/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Vortex-induced vibration (VIV) and galloping of bluff bodies pose significant challenges in offshore, civil, and mechanical engineering applications, often leading to severe structural fatigue and failure. This study numerically investigates the suppression of VIV in a square cylinder using downstream control rods of two distinct geometries—circular and square—placed at a gap spacing of 0.5D, where D is the characteristic length of the cylinder, and oriented at 45° to the main cylinder axis. Simulations were performed at Reynolds numbers of 100 and 210 using the finite volume method (FVM) in ANSYS Fluent, with structural motion modeled through a spring–mass system implemented via a user-defined function (UDF). Our results demonstrate that control rods significantly modify wake dynamics by elongating and thickening shear layers, enhancing vorticity diffusion, and enlarging recirculation regions. At Re = 100, square control rods fully suppressed VIV, while circular rods reduced oscillations by approximately 99%. In the galloping regime (Re = 210), vibration amplitudes were reduced by ~97% with circular rods and ~99.9% with square rods. Square rods consistently provided stronger suppression by stabilizing the near-wake and accelerating vorticity dissipation. These findings highlight the crucial influence of control rod geometry in passive vibration mitigation and provide practical insights for designing robust suppression strategies. Mechanical Engineering Vortex induced vibration control rods square cylinder wake dynamics Computational Fluid Dynamics Full Text Additional Declarations The authors declare no competing interests. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-7450012","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":505042193,"identity":"bcfd1109-8567-4b2e-88dc-9aa9998cdade","order_by":0,"name":"Alvi Ahmmed","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAABBElEQVRIiWNgGAWjYFACxgcHGBgOgFgGBxL/2YBEGg/g18JsANNi+OADWxpISwNBLQxQLcaGM9gOg8XwajFvP8x4gKHmTrRue/M2aR6e83Zr2w8DbamxicalReZMMtDMY89yt505VibNI3E7eduZRKCWY2m5DTi0SDDkHzjAwHY4d9uNHDNpHoPbyWYHgFoYGw7j1sL/GGjLP6CW+2+AWhLOJZudf0hAiwTQYYxtIFt4gN4/cMDO7AYhWySAtiT2AbWcSSt88LEhOcHsBtCWBHx+4U9m/vDhG1DL8cMbgL6wszc7n/7wwYcaG5xawCABiZ3YgC5CENiTongUjIJRMApGBgAAWw9uH/twKZQAAAAASUVORK5CYII=","orcid":"https://orcid.org/0009-0007-5246-4260","institution":"The University of Texas at Arlington","correspondingAuthor":true,"prefix":"","firstName":"Alvi","middleName":"","lastName":"Ahmmed","suffix":""},{"id":505042194,"identity":"bfcdff10-81d8-42d6-935d-3c206eab4bfe","order_by":1,"name":"Prasanjit Das","email":"","orcid":"","institution":"Chittagong University of Engineering \u0026 Technology","correspondingAuthor":false,"prefix":"","firstName":"Prasanjit","middleName":"","lastName":"Das","suffix":""},{"id":505042195,"identity":"1d7722cf-7fa5-4bfc-904b-b2d166587e6d","order_by":2,"name":"Md. 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This study numerically investigates the suppression of VIV in a square cylinder using downstream control rods of two distinct geometries—circular and square—placed at a gap spacing of 0.5D, where D is the characteristic length of the cylinder, and oriented at 45° to the main cylinder axis. Simulations were performed at Reynolds numbers of 100 and 210 using the finite volume method (FVM) in ANSYS Fluent, with structural motion modeled through a spring–mass system implemented via a user-defined function (UDF). Our results demonstrate that control rods significantly modify wake dynamics by elongating and thickening shear layers, enhancing vorticity diffusion, and enlarging recirculation regions. At Re = 100, square control rods fully suppressed VIV, while circular rods reduced oscillations by approximately 99%. In the galloping regime (Re = 210), vibration amplitudes were reduced by ~97% with circular rods and ~99.9% with square rods. 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