分汊河段流场的数值模拟与实验检验  

Numerical modelling and laboratory verification of the flow fields in the branching channel

作　　者：李克锋[1] 赵文谦[1] 李嘉[1] 罗麟[1] 

机构地区：[1]成都科技大学高速水力学国家重点实验室

出　　处：《水利学报》1995年第12期83-88,共6页Journal of Hydraulic Engineering

摘　　要：本文采用ｋ－ε双方程对时均流三维控制方程组沿深度积分，建立了深度平均紊流数学模型，用以模拟分汉河段紊流流场．对模型的数值求解采用有限容积法和ＳＩＭＰＬＥ程式．对分汊河段不规则边界的处理，提出了区域坐标系统法，这一方法精度较高、计算时间省．应用上述数学模型和数值方法，对仅在主渠道一侧有汊道分出的不对称分汊问题进行了计算，并用实验资料验证表明，计算值与实测值符合良好．在此基础上．对平面不对称分汊问题进行数值模拟，得出了计算区域的流速分布，计算结果较为准确地揭示了流场的内部特征．Integrating directly the 3--D governing equations of tim-averaged flow and adopting the k-ε turbulence model, a depth-averaged turbulence model is estabfished to solve the flow fields of turbulence in the branching channel in this paper. The mathematical model is numerically solved using finite volume method and SIMPLE procedure. Regional Coordinate System(RCS) method is put forward to deal with the irregular boundary. Computation shows that RCS is accurate,simple, economic for computing time and easy to operate. Using the above mentioned mathematical model and numerical method, the flow fields of the nonsymmetrical branching channel with only one. branch is firstly solved and verified with laboratory data. The comparison shows that the numerical resultsagree with the observed data fairly. On the basis of this work, the flow fields of turbulence in an ordinary branching channel is numerically solved and the velocity distribution over the flow domain is obtained. The numerical results reveal the characteristic of the flow fields.

关 键 词：分汊河段 紊流场 数值模拟 检验 

分 类 号：TV131.21[水利工程—水力学及河流动力学]