采用修正的二维浅水模型模拟连续弯道流场  

Bend-flow simulation using modified 2D shallow water depth-averaged model

作　　者：孙广才[1,2] 魏文礼[1] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]渭南师范学院数学系,陕西渭南714000

出　　处：《武汉大学学报（工学版）》2010年第1期5-9,共5页Engineering Journal of Wuhan University

基　　金：陕西省重点学科建设专项资金项目;陕西省教育厅基金项目(编号:09JK649);渭南师范学院重点科研基金项目(编号:09YKF003)

摘　　要：计入深度平均流速与真实流流速分布的差值所引起的扩散效应,建立了正交曲线坐标系下的平面二维浅水模型.紊动应力项采用以标准k-ε模型为基础的曲率效应修正紊流模型模拟,在一定程度上计及流线弯曲水流紊动应力各向异性.采用控制体积法、交错网格和SIMPLEC算法离散求解水流方程.采用修正后的模型对连续弯道水流进行了数值模拟,并与实测资料进行了比较,结果表明该模型能够有效地模拟流线弯曲的水流水力特性.The purpose of this paper is to present a 2D depth-averaged model for simulating and examining flow patterns in channel bends.In particular,this paper proposes a 2D shallow water depth-averaged model that takes into account the influence of the secondary flow phenomenon through the calculation of the dispersion stresses arisen from the integration of the products of the discrepancy between the mean and the true velocity distributions.The proposed model uses an orthogonal curvilinear coordinate system to efficiently and accurately simulate the flow field with irregular boundaries.The curvature correction turbulence model with effects of streamline curvature based on the standard k-ε turbulence model is used to compute turbulence stresses.As for the numerical solution procedure,the finite volume method with the staggered grid and the SIMPLEC solution method are used to numerically solve the flow governing equations.By using the modified shallow water mathematical model,the behaviors of the flows through a meandering channel have been computed;and the computational results coincide well with the measured data.

关 键 词：边界拟合坐标技术 横向动量交换 数值模拟 

分 类 号：TV131.4[水利工程—水力学及河流动力学]