基于混合网格和局部时间步长技术的溃决洪水快速模拟  

Fast simulation of dam-break floods based on hybrid grid and local time step technique

作　　者：彭珉 胡鹏[1,2] 管大为 Min Peng;Peng Hu;Da-wei Guan(Ocean College,Zhejiang University,Zhoushan 316021,China;Ocean Research Center of Zhoushan,Zhejiang University,Zhoushan 316021,China;College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 443002,China)

机构地区：[1]浙江大学海洋学院,舟山316021 [2]浙江大学舟山海洋研究中心,舟山316021 [3]河海大学港口航道与近海工程学院,南京210098

出　　处：《水动力学研究与进展（A辑）》2022年第5期617-624,共8页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金面上项目(11772300,12172331);长江航道规划设计研究院科研项目(2020-KYY-529112-0036);浙江省自然科学基金杰出青年项目(LR19E090002)。

摘　　要：计算效率是洪水预警预报的关键因素。该文通过局部时间步长方法减少模型计算迭代次数,通过三角形和四边形混合网格的应用以减少对计算网格总数的依赖,建立了针对溃决洪水快速模拟的浅水动力学模型。并应用模型模拟了典型溃决洪水水槽实验,结果表明:①模型计算所得溃决洪水水深和流速与实测数据吻合良好,②模型计算时间是传统模型运行时间的40%-90%,模型效率得到极大的提高,③将三角形网格分配在复杂边界附近可有效提升计算精度。Computational efficiency is a key factor in flood alarming and forecasting.In this paper,a shallow water dynamic model for rapid simulation of outburst flood is established.The local time step method is used to reduce the number of iterations of the model calculation,and the application of triangular and quadrilateral hybrid grids is used to reduce the total number of calculation grids.The model is used to simulate a typical outburst flood flume experiment.The results show that:①The water depth and velocity of the outburst flood calculated by the model fit well with the measured data,②The calculated time of the model is 40%-90%of the time of the traditional model,greatly improving the efficiency,③Allocating triangular grids to complex boundaries can effectively improve the computational accuracy.

关 键 词：溃坝洪水 浅水动力学模型 计算效率 局部时间步长技术 混合网格 

分 类 号：TV149.2[水利工程—水力学及河流动力学]