Optimal jet flow control for suppressing three-dimensional vortex-induced motion in floating cylinders at subcritical Reynolds Numbers

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

Computers & Fluids Pub Date : 2025-08-05 DOI:10.1016/j.compfluid.2025.106784

Wulong Hu , Haishan Xia , Lei Li , Zhonglan Tuo

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引用次数: 0

Abstract

Controlling vortex-induced motion (VIM) is essential for improving the fatigue life of mooring systems in floating offshore platforms. This study proposes an active control strategy using a narrow-gap jet (width ratio 0.03 D) positioned at the wake of a three-dimensional floating cylinder at subcritical Reynolds numbers (Re = 4.4 × 10⁴). Through computational fluid dynamics (CFD) simulations based on the Improved Delayed Detached-Eddy Simulation (IDDES) method, the effects of jet velocity ratio (IR = U_j/U) and injection angle (α) on VIM suppression are systematically analyzed. Without jet flow, the cylinder exhibits significant lock-in resonance at a reduced velocity U_r = 7.6, with a lateral amplitude exceeding its diameter (A_y = 1.05 D). Introducing jet flow effectively suppresses VIM, achieving an 80% reduction in transverse amplitude (A_y = 0.26 D) at α = 45° and IR = 3. Optimal suppression occurs when the jet aligns with the flow separation zone (α = 45°∼67.5°), disrupting vortex coherence and delaying boundary layer separation. In contrast, jets perpendicular (α = 90°) or upstream-oriented (α = 135°) amplify low-frequency vortex merging, worsening oscillations. Spectral analysis reveals that a 0° jet reduces vortex shedding frequency by 30%, mitigating resonance, while high IR values (> 3) at 45° shift energy to low-frequency ranges. The proposed slit-jet design demonstrates adaptability in multi-degree-of-freedom floating structures, offering a practical solution for enhancing offshore platform durability.

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亚临界雷诺数下抑制浮柱三维涡致运动的最佳射流控制

控制涡激运动是提高海上浮式平台系泊系统疲劳寿命的关键。本研究提出了一种主动控制策略，在亚临界雷诺数（Re = 4.4 × 104）下，将窄间隙射流（宽度比0.03 D）放置在三维浮柱尾迹处。通过基于改进延迟分离涡模拟（IDDES）方法的计算流体动力学（CFD）仿真，系统分析了射流速度比（IR = Uj/U）和喷射角（α）对VIM抑制的影响。在没有射流的情况下，圆柱在降低速度Ur = 7.6时表现出明显的锁紧共振，横向振幅超过其直径（Ay = 1.05 D）。射流的引入有效地抑制了VIM，在α = 45°和IR = 3时，横向振幅（Ay = 0.26 D）降低了80%。当射流与流动分离区（α = 45°~ 67.5°）对齐时，抑制效果最佳，破坏了涡旋相干性，延缓了边界层分离。相反，垂直（α = 90°）或上游（α = 135°）射流放大了低频涡旋合并，加剧了振荡。光谱分析表明，0°射流使旋涡脱落频率降低30%，减轻了共振，而高红外值(>；3)在45°时将能量移至低频范围。所提出的狭缝射流设计证明了多自由度浮式结构的适应性，为提高海上平台的耐久性提供了一种实用的解决方案。

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

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.