梯形断面明渠丁坝绕流水力特性三维数值模拟  

3-dimensional numerical simulation of hydraulic characteristics of spur dike flow in a trapezoid open channel

作　　者：魏文礼[1] 洪云飞[1] 邵世鹏[1] 刘玉玲[1] 

机构地区：[1]西安理工大学水利水电学院710048西安

出　　处：《应用力学学报》2015年第2期294-298,357,共5页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51178391);陕西省科学研究计划项目(2014K15-03-05);陕西省西北旱区生态水利工程重点实验室开放基金(106-221223);中央财政支持地方高校发展专项资金特色重点学科项目(106-00X101)

摘　　要：采用两相流混合模型,并选取RNG k-ε湍流模型封闭两相流时均方程,对梯型断面明渠非淹没式丁坝绕流水力特性进行了三维数值模拟。采用有限体积法离散计算区域,求解速度与压力耦合方程组时使用半隐式SIMPLE(Semi-Implicit Method for Pressure-Linked Equations)算法,模拟自由水面时采用了VOF(Volume of Fluid)法。对丁坝后不同的回流长度进行了分析比较,并将模拟结果与实测资料进行了对比验证,结果表明两者吻合较好,相对误差小于8%,说明该模型能够很好地模拟明渠丁坝绕流的水力特性分布规律。Two-phase mixture model and the 3-dimensional RNG k-ε turbulence model are applied to numerically simulate the hydraulic characteristics of non-submerged spur dike flow in a trapezoid open channel. The finite volume method is used to discrete the calculated region, the SIMPLE(Semi-Implicit Method for Pressure-Linked Equations) algorithm is adopted to solve the coupled equations of velocity and pressure and the VOF(Volume of Fluid) method is used to simulate the free surface. Results by simulation and measured data of the different length of recirculation are analyzed and compared, and are in a good agreement, and the relative error is less than 8%, which indicates that the model can well simulate the hydraulic characteristics of spur dike flow in a trapezoid open channel.

关 键 词：丁坝绕流 回流长度 数值模拟 湍流 水力特性 

分 类 号：TV131.4[水利工程—水力学及河流动力学]