Large Eddy Simulation for Plunge Breaker and Sediment Suspension

查看全文 作　　者：[1,2]白玉川;[3]C.O.NG

机构地区：[1]Institute of Sediment on River and Coast Engineering,Tianjin University,Tianjin 300072,China;[2]The State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200062,China;[3]Department of Mechanical Engineering,the University of Hong Kong,Hong Kong,China

出　　处：《China Ocean Engineering》索引2002年第17卷第2期,共14页

基　　金：This work was financially supported by the National Natural Science Foundation of China under contract No.59809006 and 59890200,and by Grant HKU 7117/99E from the Research Grants Council of the Hongkong Special Administrative Region. 摘　　要：Breaking waves are a powerful agent for generating turbulence that plays an important role in many fluid dynamicalprocesses, particularly in the mixing of materials. Breaking waves can dislodge sediment and throw it into suspension,which will then be carried by wave-induced steady current and tidal flow. In order to investigate sediment suspension bybreaking waves, a numerical model based on large-eddy-simulation (LES) is developed. This numerical model can beused to simulate wave breaking and sediment suspension. The model consists of a free-surface model using the surfacemarker method combined with a two-dimensional model that solves the flow equations. The turbulence and the turbulentdiffusion are described by a large-eddy-simulation (LES) method where the large turbulence features are simulated bysolving the flow equations, and a subgrid model represents the small-scale turbulence that is not resolved by the flowmodel. A dynamic eddy viscosity subgrid scale stress model has been used for the present simulation. By applying thismodel to Stokes' wave breaking problem in the surf zone, we find that the model results agree very well with experimentaldata. By use of this model to simulation of the breaking process of a periodic wave, it can be found that the model canreproduce the complicated flow phenomena, especially the plunging breaker. It reflects the dynamic structures of roller orvortex in the plunging breaker, and when the wave breaks, many strong vortex structures will be produced in the innersurf zone where the concentration of suspended sediment can thereby become relatively high. 关键词：wave BREAKING large EDDY simulation SUBGRID-SCALE model SURF zone marker and cell method sediment suspension

相关文献

参考文献（32）
引证文献（5）
耦合文献（0）

参考文献(32)

引证文献(5)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Large Eddy Simulation for Plunge Breaker and Sediment Suspension

参考文献(32)

引证文献(5)

用户提示