天然弯曲河流的三维数值模拟  

THREE DIMENSIONAL NUMERICAL SIMULATION OF NATURAL CURVED RIVER

作　　者：吴修广[1] 沈永明[2] 潘存鸿[1] 

机构地区：[1]浙江省水利河口研究院,杭州310020 [2]大连理工大学海岸和近海工程国家重点实验室,大连116024

出　　处：《力学学报》2005年第6期689-696,共8页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金(10332050;50579005)国家重点基础研究发展(973)计划(2005CB724202)资助项目.~~

摘　　要：对Cartesian坐标系下的RANS方程进行三维ξ-η-ζ坐标变换,建立了非正交三维曲线坐标下弯曲河流的标准κ-ε湍流模型.对自由水面的模拟采用“改进的刚盖假定”,河床和岸壁阻力的模拟采用壁面函数方法.模型通过具有实验数据的实验室连续弯曲水槽进行验证,模拟的流速值与实验数据吻合良好,将模型应用于天然连续弯曲河流的流场计算,给出了表层和底层流速矢量场和11个断面二次环流矢量图,显示该模型具有模拟天然弯曲河流的能力.Through 3D ξ-η-ζ coordinate transformation to RANS in Cartesian coordinate, a 3D standard κ-ε turbulent model in non-orthogonal curvilinear coordinates has been build. The modified rigid-lid hypothesis is put forward to simulate the free surface, and the wall function is introduced to model the bed and bank resistance. The model is validated through meandering channel in laboratory, and comparison shows well agreement between survey data and calculated one. The model was applied to simulate the natural river and the calculating results accord well with the data, which shows the application value of the model.

关 键 词：天然弯曲河流 ξ-η-ζ坐标变换 非正交曲线坐标 κ-ε湍流模型 改进的刚盖假定 

分 类 号：TV131.4[水利工程—水力学及河流动力学]