恒流条件下三桩基础局部冲刷数值模拟  

Numerical simulation of local scouring of three piles under steady currents

作　　者：刘钦[1] 赵红宇 余冰茜 张宁[2] 王哲 刘磊[1,2] 黄坤鹏[1] LIU Qin;ZHAO Hongyu;YU Bingqian;ZHANG Ning;WANG Zhe;LIU Lei;HUANG Kunpeng(School of Civil Engineering,Chang′an University,Xi′an 710061,China;School of Water Resources and Hydropower Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]华北电力大学水利与水电工程学院,北京102206

出　　处：《哈尔滨工程大学学报》2025年第3期438-449,共12页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(U1906234,U2106224,51974124);中央高校基本科研业务费专项资金项目(2020MS027,300102281206).

摘　　要：为研究不同水流攻角和桩间距对三桩局部冲刷的影响,本文采用计算流体动力学软件FLOW-3D,对恒流条件下砂质海床上等边三角布置的三桩基础进行了局部冲刷数值模拟。利用动量守恒方程、重整化群k-ε模型以及推移质和悬移质方程分别建立起水动力模型和泥沙冲刷模型,用于模拟桩周的流场和局部冲刷。在进行数值模拟之前,利用冲刷试验对水动力模型和泥沙冲刷模型进行了验证,显示出良好的一致性。本文详细讨论了特定桩间距和水流攻角下三桩周围的局部冲刷特性。结果表明:三桩基础的局部冲刷存在着最优桩间距、最不利桩间距和最不利水流攻角。为减小局部冲刷对基础的影响,在三桩及多桩基础的设计施工中,应当根据水流方向合理选择各桩位布置。The CFD software FLOW-3D was used to simulate the local scour of three piles arranged in an equilateral triangle on a sandy seabed under constant current conditions to examine the influence of different flow attack angles and pile spacing on the local scour of three piles.Hydrodynamic and sediment erosion models were developed initially using the navier-stokes equation,RNG k-εmodel,and bed and suspended load equations to simulate the flow field and local scour around the pile.Prior to numerical simulation,the hydrodynamic model and the sediment erosion model were verified by the erosion test of Roulund et al,demonstrating good consistency.The local scour characteristics around three piles under specific pile spacing and flow attack angle were discussed in detail.The results indicate that the optimal pile spacing(G/D),the most unfavorable pile spacing,and the most unfavorable flow angle exist in the local scour of the three-pile foundation.Therefore,to reduce the influence of local scour on the foundation,the arrangement of each pile position should be reasonably selected according to the direction of water flow in the design and installation of three-pile and multi-pile foundations.

关 键 词：海上风电 三桩基础 局部冲刷 冲刷特性 桩间距 水流攻角 数值模拟 

分 类 号：U656[交通运输工程—港口、海岸及近海工程]