摘要
为研究顺直明渠断面的流速分布,选取梯形明渠为例,基于计算流体动力学(CFD)方法建立三维顺直明渠数值仿真模型,采用刚盖假定法和流体体积(VOF)法分别捕捉自由水面,对比研究了不同宽深比明渠的断面流速分布;选取标准k-ε模型、RNG k-ε模型及雷诺应力模型(RSM)分别封闭雷诺平均(RANS)方程,对比评估了各数值模型的模拟效果。结果表明:刚盖假定法适用于宽深比大的宽浅明渠,VOF法适用于宽深比小的狭窄明渠,3种模型中RNG k-ε模型的模拟误差更稳定,更加适用于顺直明渠模拟。所建立的数值模型能够很好地模拟明渠断面的实际流速分布,模拟数值与实测数值的误差在6.00%以内。
In order to study the flow velocity distribution of the straight open channel section,taking a trapezoidal open channel as an exam⁃ple,a Computational Fluid Dynamics(CFD)method was used to establish a three⁃dimensional straight open channel numerical simulation model.The rigid⁃lid hypothesis method and Volume of Function(VOF)method were used to capture the free water surface,and the flow ve⁃locity distribution of the open channels with different aspect ratios was comparatively studied.The standard k⁃εmodel,RNG k⁃εmodel and Reynolds Stress Model(RSM)were selected to close reynolds average(RANS)equation,also compared and evaluated the simulation effi⁃ciency of the numerical models.The results show that the rigid⁃lid hypothesis method is suitable for wide and shallow open channel with a large as⁃pect ratio.The VOF method is suitable for narrow open channel with a small aspect ratio.Among the three models,the simulation error of the RNG k⁃εmodel is more stable,and it is more suitable for simulating straight open channel.The numerical model established in this paper can simulate the actual flow velocity distribution well,and the error between the simulated value and the measured value is within 6.00%.
作者
程科
罗强
宁芊
周新志
CHENG Ke;LUO Qiang;NING Qian;ZHOU Xinzhi(College of Electronic Information and Engineering,Sichuan University,Chengdu 610065,China;Chengdu Wanjiang Gangli Technology Co.,Ltd.,Chengdu 610000,China)
出处
《人民黄河》
CAS
北大核心
2022年第3期160-164,共5页
Yellow River
基金
新疆维吾尔自治区区域协同创新专项(2020E0247,2019E0214)。
关键词
顺直明渠
刚盖假定法
VOF法
湍流模型
CFD
流速分布
straight open channel
rigid⁃lid hypothesis method
VOF method
turbulent model
CFD
flow velocity distribution
