中文摘要：

采用不同的紊流模型：标准k—ε模型、RNGk—ε模型、Reynolds应力模型，结合VOF方法跟踪处理自由表面，数值模拟了明渠180°弯道水流的复杂流动状态。将数值模拟的结果与试验资料进行比较，分析了不同紊流模型的计算精度。研究表明，标准k—ε模型无法准确地预测具有复杂二次流特性的紊流流动，Reynolds应力模型和RNGk-ε模型，能够有效地预测具有强曲率影响的明渠弯道三维水流运动。

英文摘要：

Different turbulence models provided by commercial software FLUENT, which includes standard model, RNG model and Reynolds Stress model, have been used to simulate the turbulence characteristics in 180 deg channel bend, with VOF method tracking the free surface. In contrast to the experimental data, the precision of numerical simulation by each turbulence model has been estimated. It is shown that Reynolds Stress model and RNG model have the superiority when simulating turbulence dominating by curva ture effects.