低弗汝德数闸后淹没水跃的数值模拟  

Numerical simulation of submerged hydraulic jump downstream of the sluices with low froude number

作　　者：郑铁刚[1] 戴会超[1] 王玲玲[1] 丁全林[2] 

机构地区：[1]河海大学水利水电学院,南京210098 [2]河海大学力学与材料学院,南京210098

出　　处：《水动力学研究与进展（A辑）》2010年第6期784-791,共8页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(50779028);国家杰出青年基金(50925932);河海大学自然科学基金(2009423011)

摘　　要：通过求解雷诺时均Navier-Stokes方程,对弗汝德数为3.19的淹没水跃进行了数值模拟。应用标准k-ε模型和RNG k-ε模型结合VOF(volume of fluid)自由表面跟踪技术,得到了淹没水跃自由表面位置、纵向速度、紊动能及速度矢量等变化情况。结合实验数据,详细对比研究了两种模型的模拟结果,分析了Fr=3.19淹没水跃的内部流场特性。研究表明RNG k-ε模型能更好的模拟低弗汝德数下淹没水跃的紊流结构,给出了2<X/Y1<24为水跃发展区,并得出水跃产生的旋滚对紊动的产生和耗散起着重要作用。Based on solving Reynolds averaged Navier-Stokes equations,the submerged hydraulic jump was simulated numerically with the Froude number 3.19.The standard turbulence model and RNGmodel with the tracking method of free surface were used to simulate numerically the submerged hydraulic jump.The free surface profile,mean velocity,turbulent kinetic energy and velocity vector were obtained.Combined with experimental data,a detailed study of some main results was done by comparing the two models.And the inner flow field characteristics of submerged hydraulic jump with the Froude number 3.19 were analyzed.It is indicated that RNGmodel performed better in the aspects of the turbulent structure and the macroscopic water flow structure for submerged hydraulic jump with low Froude number.It is also showed the hydraulic jump developing region where X/Y1 from 2 to 24.Surface roller was found to play an important role in turbulence generation and dissipation.

关 键 词：低弗汝德数 闸后淹没水跃 紊动能 数值模拟 

分 类 号：TV131.2[水利工程—水力学及河流动力学]