种植凤眼莲河道的水流三维数值模拟

采用VOF法对种植凤眼莲的河道的自由水面进行跟踪,将凤眼莲聚集带简化为多孔介质区域,在考虑惯性损失的情况下按不分区和分区2种方案分别对河道水流进行三维数值模拟。数值模拟结果与试验结果的对比表明:分区方案在模拟水位壅高、流速分布、紊动特性等方面均比不分区方案更符合实际情况;用分区多孔介质模型模拟凤眼莲河道水流是可行的。

Three-dimensional numerical simulation of flows through eichornia crassipes in watercourse

In this numerical study,the VOF method was used to track free-surface and eichornia crassipes simplified as porous medium.With consideration of inertial loss,non-divisional and divisional methods were used to simulate flows through eichornia crassipes in an ecological watercourse.Comparing the experimental measurements,it was found that the numerical simulations with the divisional method perform better with water-level prediction,velocity distribution,and turbulence characteristics than simulations with the non-divisional method.The results of numerical simulation show that it is feasible to use the divisional model to simulate flows through eichornia crassipes in an ecological watercourse.