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针对Mixture模型,考察了Realizable k-ε模型,SSTk-ω模型,v2-f模型,LES模型等4种湍流模型对阶梯溢流坝水流数值模拟的适用性.通过对非掺气区域坝面平均流速、旋度大小、边界层厚度的计算,并与实验结果进行分析比较,结果表明:Realizable k-ε模型考虑了流体微团的旋转效应,提高了对较大曲率流动、旋流流动和涡旋运动的计算精度,对阶梯溢流坝有很好的适用性.以Realizable k-ε模型计算结果为基础,进一步分析了边界层内的速度分布、阶梯面压力分布等坝面水流特性.
According to Mixture model, four kinds of turbulence models, such as Realizable k-ε model, SSTk-ω model, v2-f model and LES model, are investigated for numerical simulation of water flow in stepped spillway dam. The results show that the Realizable k-ε model considers the rotation effect of the fluid micelles and improves the effect of the large curvature flow, the swirling flow and the vortex The calculation accuracy of rotational motion is very suitable for stepped overflow dam.Furthermore, based on the calculation results of Realizable k-ε model, the velocity distribution in the boundary layer and the pressure distribution on stepped surface are analyzed.