The influence of channel side slope on flow in strongly curved channel bends is studied numerically. The performances of five different turbulence models are investigated. Comparison to experimental measurements demonstrates that the fully 3D numerical model can reliably simulate a channel bend flow field. Among the tested turbulence models, the realizable k − ε model performed best. The present study also demonstrates that the realizable k − ε model can satisfactorily predict smaller flow features in bend flow, such as the outer-bank circulation cell. The validated model is employed to carry out additional computations for channel bends with different side slopes. It is found that the number, position, and strength of secondary flow cells varies with the channel side slope, with corresponding influence on flow distribution and flow vorticity.

数值研究了在强弯曲的河道弯道中河道边坡对流动的影响。研究了五种不同湍流模型的性能。与实验测量结果的比较表明，完整的3D数值模型可以可靠地模拟通道弯曲流场。在测试的湍流模型中，可实现的k  -  ε模型表现最佳。本研究还表明，变现ķ  -  ε该模型可以令人满意地预测弯流中较小的流动特征，例如岸外循环单元。经过验证的模型可用于对具有不同边坡的弯道进行附加计算。发现二次流动池的数量，位置和强度随通道侧斜率而变化，对流动分布和流动涡度有相应的影响。