波流耦合作用下紊流边界层水沙数学模型  

Mathematical models of flow and sediment in turbulent boundary layer under wave-current interaction

作　　者：诸裕良[1] 徐秀枝[1] 闫晓璐[1] 

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098

出　　处：《水动力学研究与进展（A辑）》2016年第4期422-432,共11页Chinese Journal of Hydrodynamics

摘　　要：在河口地区,波流相互作用下紊流边界层的泥沙起动输移规律非常复杂,深入探讨其泥沙运动规律很有必要。该文基于波浪边界层的控制方程,引入了时均水流压力,通过波流相互作用下的摩阻流速反映波浪与水流的夹角,用标准k-ε模型封闭方程,建立了波流叠加的紊流边界层内的弱耦合水流模型,分别讨论了波浪速度振幅、时均流速等的分布情况,与实测数据对比得到了较好的模拟结果。其次,基于水流模型建立了泥沙模型,采用对称振荡流和波流相互作用两种情况下的泥沙实测数据验证了泥沙模型的正确性,讨论了不同分布规律的涡黏系数对于模型的影响,为实际工程提供理论参考,结果具有一定的指导意义。In estuary area, sediment starting and transport of turbulent boundary layer are very complex under wave-current interaction. It is necessary to explore the sediment motion law. Based on the governing equation of wave boundary, the article puts forward a coupling flow model. Averaged current pressure is considered here. And the angle between wave and current is reflected by friction velocity under wave-current interaction. The equation is closed by k- ？ model and built by the superposition of waves and current in the turbulent boundary layer. The distributions of wave amplitude and time-average flow velocity are discussed. Measured data are used to verify the model consistently. After verification, characteristics of turbulence under wave-current interaction are analyzed by the model. Posteriorly, based on the flow model, a sediment model is developed. The model is verified with two different kinds of experimental data, including the sediment movement of symmetrical oscillatory flow and wave-current interaction. In addition, the effects of different types of eddy viscosity on the model are discussed which provide theoretical reference for practical engineering.

关 键 词：紊流边界层 波流叠加 水沙模型 涡黏系数 

分 类 号：TV139.2[水利工程—水力学及河流动力学]