The study presents a systematic assessment of 2D RANS-VOF simulation of positive surge wave propagation in open channels using three widely used turbulence models: standard k-ε, RNG k-ε and the k-ω SST. The numerical simulation results are validated on the basis of rigorous comparison with data obtained from existing physical model studies and in-house experiments. The study finds that the standard k-ε model fails to simulate the free surface features of the surge wave precisely. The RNG k-ε and the k-ω SST models show better performance in this regard. The standard k-ε model is also unable to replicate the physical trends of the measured velocity data. While the overall agreement between the velocity characteristics estimated by the RNG k-ε model and experimental data is satisfactory, the model exhibits weakness while capturing the recirculation zone beneath the breaking surge having Froude number 1.6. The k-ω SST model simulates the pertinent velocity characteristics and the relevant flow structures with better accuracy in comparison to the RNG k-ε model for both undular and breaking surges. The non-hydrostatic pressure field is well approximated by both the RNG k-ε and the k-ω SST models. A comparison of the free surface levels computed by SGN models reveals that the limitation of the depth averaged non-hydrostatic models in capturing the breaking of waves may be overcome by the proposed RANS-VOF approach. Comparison with 2D LES results obtained from existing studies on positive surge modelling indicates that the proposed 2D RANS-VOF model is capable of producing results almost at par with the LES models.

该研究使用三种广泛使用的湍流模型：标准k -ε、RNG k -ε 和k- ω SST ，对明渠中正浪涌波传播的 2D RANS-VOF 模拟进行了系统评估。在与从现有物理模型研究和内部实验中获得的数据进行严格比较的基础上，验证了数值模拟结果。研究发现，标准的k -ε模型无法精确模拟浪涌的自由表面特征。RNG k -ε 和k- ω SST 模型在这方面表现出更好的性能。标准k-ε 模型也无法复制测得的速度数据的物理趋势。虽然 RNG k -ε 模型估计的速度特性与实验数据之间的总体一致性令人满意，但该模型在捕获弗劳德数为 1.6 的破坏浪涌下方的再循环区时表现出弱点。与 RNG k -ε 模型相比，k-ω SST 模型模拟了相关的速度特性和相关的流动结构，对于波状和破坏性浪涌都具有更高的精度。非静水压力场由 RNG k -ε 和k-很好地逼近ω SST 模型。由 SGN 模型计算的自由表面水平的比较表明，深度平均非静水模型在捕获波浪破裂方面的局限性可以通过提出的 RANS-VOF 方法来克服。与从现有正浪涌模型研究中获得的 2D LES 结果比较表明，所提出的 2D RANS-VOF 模型能够产生与 LES 模型几乎相同的结果。