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高桩码头群桩绕流水动力特性数值分析

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为探究高桩码头桩基础形式下的群桩水动力特征,基于Flow-3D软件对来流速度为0.25～1.50 m/s的3×3群桩阵列绕流的湍流流场进行三维数值模拟.研究结果表明:桩柱的两侧均形成高速区,随着来流速度的增加,高速区范围显示出逐渐扩大的趋势.上游桩后方的回流区范围较大,而中游桩和下游桩的回流区大小基本相同,均小于上游桩的回流区.随着来流速度的增加,剪切力和流体力逐渐增大,并随来流速度呈非线性增长趋势,且上游桩受力最大,下游桩次之,中游桩受力最小.随着来流速度的增加,群桩尾涡核心区的涡量随之增大,中游桩和下游桩后方的尾涡强度明显比上游桩的弱,中游桩和下游桩的尾迹涡长度保持稳定.随着来流速度的增加,漩涡强度显著提高,前桩与后桩之间的漩涡相互纠缠.研究成果对于理解群桩绕流的水动力特性具有重要意义,可为工程设计和实际应用提供参考.
Numerical simulation study on hydrodynamic characteristics of flow around pile groups in high-pile wharfs
To investigate the hydrodynamic characteristics of pile groups in high-pile wharf foundations,this study conducted three-dimensional numerical simulation of the turbulent flow field around a 3×3 pile group array with incoming flow velocities ranging from 0.25 m/s to 1.50 m/s by using Flow-3D software.The results indicate that high-velocity zones form on both sides of the piles,and the extent of these zones tends to expand as the incoming flow velocity increases.The recirculation zone behind the upstream pile is larger,while the recirculation zones behind the midstream and downstream piles are similar in size and smaller than that of the upstream pile.As the incoming flow velocity increases,the shear force and fluid force increase non-linearly.The upstream pile experiences the greatest force,followed by the downstream pile,with the midstream pile experiencing the least force.Additionally,the vorticity in the core region of the wake vortex increases with higher incoming flow velocity.The wake vortex intensity behind the midstream and downstream piles is significantly weaker than that behind the upstream pile,with the wake vortex length remaining stable for the midstream and downstream piles.As the incoming flow velocity increases,the vortex intensity significantly increases,and the vortex structures between the upstream and downstream piles become entangled.These findings are significant for understanding the hydrodynamic characteristics of flow around pile groups and provide valuable reference for engineering design and practical applications.

hydraulics of port and harbor structuresflow around pile grouphydrodynamic characteristicvortex structureFlow-3D software

陈杰、吴剑、伍志元、邓斌、蒋昌波

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长沙理工大学 水利与环境工程学院,湖南 长沙 410114

长沙理工大学 水沙科学与水灾害防治湖南省重点实验室,湖南 长沙 410114

长沙理工大学 洞庭湖水环境治理与生态修复湖南省重点实验室,湖南 长沙 410114

港工建筑物水力学 群桩绕流 水动力特性 漩涡结构 Flow-3D软件

国家重点研发计划项目湖南省自然科学基金项目湖南省自然科学基金项目国家自然科学基金项目

2021YFB26011002022JJ100472022JJ2004152271257

2024

10.16544/j.cnki.cn43-1494/u.202407152024101993

交通科学与工程
长沙理工大学

交通科学与工程

影响因子：0.444
ISSN：1674-599X
年,卷(期)：2024.40(5)
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