水力发电学报2025，Vol.44Issue(11)：36-49,14.DOI:10.11660/slfdxb.20251104
颗粒特性对明渠挟沙水流输运的影响机制研究
Study on mechanism of particle characteristics influencing sediment transport in open-channel flows
摘要
Abstract
Suspended load movement is an important form of river sediment transport,and its existence in the flow poses a significant impact on flow turbulences.The movement is complicated,and no agreement has been reached on the mechanism of water-sediment interaction.This paper presents an application of the OpenFOAM two-phase flow model and its simulations of equilibrium sediment transport under different flow conditions,focusing on how the size,density and concentration of suspended sediment particles impact turbulent flow characteristics,and on the mechanism of flow turbulences modulated by drag force,density gradient,and particle collision.The results show that 1)with an increasing suspended particle size,the velocity of both the water flow and particles decreases overall,and the velocity gradient near the riverbed increases significantly;In the near-wall layer,sediment concentration gradient increase,turbulence intensity decreases first and then increases,and its peak values increase.2)An increase in suspended particle density leads to an increase in the average turbulent flow velocity.The smaller the suspended particle density is,the more uniform the vertical concentration profile,and vice versa.3)An sediment concentration increase reduces the average turbulent flow velocity and turbulence intensity,and the higher the concentration,the more obvious its suppressing effect.4)An increase in drag force raises turbulent flow rate and suppresses turbulence intensity and sediment suspension.Suspended sediment density gradient has a suppressing effect on both bottom layer velocity and top layer turbulence intensity.Particle collision reduces average velocity and significantly enhances turbulence,thus promoting sediment suspension.关键词
两相流/悬移质/紊流调制/拖曳力/颗粒碰撞/密度梯度Key words
two-phase flow/suspended sediment/turbulence modulation/drag force/particle collision/density gradient分类
计算机与自动化引用本文复制引用
谢皓南,王浩,雷泳南,林宇航,赵琳,林鸿燕..颗粒特性对明渠挟沙水流输运的影响机制研究[J].水力发电学报,2025,44(11):36-49,14.基金项目
福建省自然科学基金(2023J01406) （2023J01406）
福建省交通运输科技项目(ZH202309) （ZH202309）
