不同水头与流量条件下堤防梯形决口水流特性数值模拟

Numerical simulation of flow characteristics of dike with trapezoid breach under different head and flow conditions

本文对有矩形障碍物的溃坝算例进行模拟验证,将FLOW-3D计算的速度场结果与FLUENT、Wang的结果进行对比,三者结果基本一致,验证了Flow-3D软件用于堤防决口三维数值模拟的可行性.采用某实际河道堤防简化建模,建立了在决口口门形状、尺寸一定的条件下,上游不同水头、不同流量工况下的堤防决口三维数值模拟.分析结果表明:不同水头、不同流量作用下决口较大的流速平面分布主要分布在决口上游进口左侧发生水跌处.因此,在进行决口封堵时,应注意预先做好决口上游侧的裹头处理,防止在封堵的过程中因流速过大导致溃口口门扩宽;在选取封堵材料时,也可根据溃口处流速分布来选择相应的封堵料粒径.

In this paper,the results of the flow-3d calculation for an example of dam break with rectangular obstruction were compared to the results of FLUENT and Wang,and the results were almost identical. The feasibility of Flow-3D software for three-dimensional numerical simulation of embankment burst is verified. Based on the simplified modeling of an actual river embankment,the three-dimensional numerical simulation of the embankment of different water heads and different flow conditions of the upstream water head and different flow conditions is established. The results show that the distribution of the velocity plane distribution in the upstream of the outlet is mainly distributed on the left side of the outlet.Therefore,we should pay attention to advance the mouth of the upstream side of the head handle,to prevent the dyke broaden by excessive velocity during the process of dyke breach closure. It can according to the velocity distribution of the outlet to corresponding sealing particle size when to select the sealing material.