JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A

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Numerical investigation of the flow pattern around a vertical cylinder under wave action

Author(s): Ben HE, Junkang WENG, Yuan LIN, Yifan GAO, Maoxing WEI, Fang HE
Affiliation(s): PowerChina Huadong Engineering Co., Ltd., Hangzhou 311100, China; more
Corresponding email(s): hefang@zju.edu.cn
Key Words: Horseshoe vortex; Pressure distribution; Keulegan-Carpenter (KC) number; Vortex strength; Bed shear stress

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Ben HE, Junkang WENG, Yuan LIN, Yifan GAO, Maoxing WEI, Fang HE. Numerical investigation of the flow pattern around a vertical cylinder under wave action[J]. Journal of Zhejiang University Science A,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/jzus.A2500436

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author="Ben HE, Junkang WENG, Yuan LIN, Yifan GAO, Maoxing WEI, Fang HE",
journal="Journal of Zhejiang University Science A",
year="in press",
publisher="Zhejiang University Press & Springer",
doi="https://doi.org/10.1631/jzus.A2500436"
}

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%A Ben HE
%A Junkang WENG
%A Yuan LIN
%A Yifan GAO
%A Maoxing WEI
%A Fang HE
%J Journal of Zhejiang University SCIENCE A
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doi="https://doi.org/10.1631/jzus.A2500436"

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T1 - Numerical investigation of the flow pattern around a vertical cylinder under wave action
A1 - Ben HE
A1 - Junkang WENG
A1 - Yuan LIN
A1 - Yifan GAO
A1 - Maoxing WEI
A1 - Fang HE
J0 - Journal of Zhejiang University Science A
SP - 142
EP - 154
%@ 1673-565X
Y1 - in press
PB - Zhejiang University Press & Springer
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doi="https://doi.org/10.1631/jzus.A2500436"

Abstract
Chinese Summary
Academic Network
Reviewer Comment

Abstract: The interaction between vertical cylinders and waves is an important research problem due to the prevalence of cylinder-type structures in marine infrastructure. A major goal is to improve their design for greater stability in the presence of waves. In this study, we numerically investigate the formation of vortices around a vertical cylinder under wave action, emphasizing the role of the flow field in potential bed erosion. Surface pressure distribution analysis elucidates the generation and evolution of the vortices, while the spatial distributions of bed shear stress quantify the significant influence of the flow field and vortex dynamics on scour around the cylinder. Numerical simulations were performed over a range of Keulegan-Carpenter (KC) numbers (12–26) to systematically resolve the 3D flow structures. Validation against particle image velocimetry (PIV) data confirms the accuracy of these simulations. Our results show that both the strength and spatial extent of the horseshoe vortex increase markedly with increasing KC number, leading to intensified bed shear stress and elevated scour potential around the cylinder.

波浪作用下垂直圆柱周围流场数值研究

作者：何奔¹，翁俊康²，林源²，高祎凡¹，魏茂兴²，何方²
机构：¹中国电建集团华东勘测设计研究院有限公司，中国杭州，311100；²浙江大学，海洋学院，中国舟山，316021
目的：海洋工程中垂直圆柱体结构（如桥墩、海上风电基础等）在波浪作用下，其周围流场涡旋演化易引发床面冲刷，导致结构失稳。本文旨在通过数值模拟手段，系统研究垂直圆柱在波浪作用下的流场演化、涡结构发展及其对床面剪切应力和潜在冲刷的影响，为海洋圆柱结构的设计优化与稳定性提升提供理论支撑。
创新点：1.通过数值模拟解析圆柱周围三维涡旋相干结构，系统揭示了不同基奥根-卡彭特数下马蹄涡的演化规律；2.揭示涡结构演化与床面剪切应力之间的机制联系，提出了涡结构对潜在冲刷的关键控制作用；3.首次提出涡结构相位演化与床面剪切应力峰值之间的时空对应关系，为理解短期泥沙起动提供了新视角。
方法：1.构建三维数值波浪水槽，针对不同KC数进行多工况模拟；2.通过Q准则识别涡结构，分析马蹄涡与尾涡的生成、演化与相互作用；3.计算床面剪切应力分布，结合涡结构演化分析其对泥沙起动与潜在冲刷的影响。
结论：1.KC数对马蹄涡特性影响显著，低KC数下马蹄涡结构稳定单一，随着KC数的增加，开始出现多涡共存现象，流场结构变得更加复杂多变；2.上游马蹄涡活跃期对应床面切应力正峰值，可能加剧局部冲刷；而下游尾涡发展期则引发床面切应力负峰值，导致泥沙再分布；3.床面剪应力的分布与马蹄涡和尾迹涡的活动密切相关，随着KC数的增加，圆柱体附近整体床面剪应力显著增强，且峰值区域与涡结构紧贴床面的位置高度一致。

关键词组：马蹄涡；压力分布；KC数；涡旋强度；床面切应力

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波浪作用下垂直圆柱周围流场数值研究

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