基于Fluent的明渠水流三维数值模型验证

Verification of 3-D Numerical Model for Open-channel Flows Based on Fluent

基于Tominaga和Nezu等人的矩形明渠试验模型数据,利用Fluent软件,分别采用刚盖假定方法和VOF方法,模拟明渠自由水面,对比研究不同宽深比条件下的明渠水流特性。通过分析研究得到:与刚盖假定法得到的模拟值相比,VOF模拟值更接近试验值,且VOF方法模拟得到数据显示在宽深比小于5时,垂线最大流速出现在相对水深0.6～0.8的范围内,这与传统理论研究也是相符合的。

Based on the open channel flume experimental data of Tominaga and Nezu, the characteristics of open channel flow with rigid-lid hypothesis and volume of fluid （VOF） for dealing with the free-surface problems were simulated by FLUENT model. Simulated velocities show that VOF method can get better results than that with rigid-lid hypothesis, the maximum vertical velocity by VOF appears at the relative depth of 0. 6 - 0.8 if the widthdepth ratio is less than 5, which is consistent with the traditional theoretical value.