三维悬沙模型及河岸边界追踪方法Ⅰ-泥沙模型  

3-D suspended-load model and moveable river bank tracking. Part 1,sediment model

作　　者：胡德超[1,2] 张红武[1] 钟德钰[1] 丁赟[1] 尹小玲[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]长江科学院河流研究所,武汉430010

出　　处：《水力发电学报》2010年第6期99-105,共7页Journal of Hydroelectric Engineering

基　　金：国家重点基础研究发展计划(2007CB714100);长江科学院所基金项目(CKSQ2010075,YWF0901,CKSF2010001)

摘　　要：建立了无结构、z坐标网格上的三维悬移质泥沙数学模型,为保证计算的守恒性,泥沙输运方程使用有限体积法求解;为使泥沙模型的求解对水流模型的求解不形成附加的稳定限制条件,泥沙输运方程使用亚循环分步模式离散。使用了垂向亚网格技术,使垂向网格能实时地贴合和追踪自由水面和床面,相对于传统的z坐标网格提高了计算精度;同时,在垂向亚网格技术中,为避免因泥沙冲淤产生的垂向小尺度网格对计算时间步长的限制,提出了垂向网格融合技术对底层网格进行处理。借助直壁复式明渠、异重流潜入的水槽实测资料对模型进行了检验,计算结果与试验资料符合良好。A 3-D suspended-load model is developed on a unstructured z-level grid.The sediment transport equation is solved by the finite volume method to keep the simulation conservative,and a fractional sub-cycling discretization is employed to avoid extra stability constraint on the computation.The sub-grid technique is used in the model to make the vertical grid follow the free surface and the river bed well,and in the bed degradation and aggradation cases small vertical grids are inserted into the base grids to eliminate their extra constraint on time step.The model is tested by a compound open channel with vertical merged wall and a density flow in the flume,and the simulations agree well with the experiment data.

关 键 词：泥沙动力学 三维 z坐标 网格融合 直壁复式明渠 异重流 

分 类 号：TV147[水利工程—水力学及河流动力学]