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基于Launder-Sharma(LS)低雷诺数k-ε两方程湍流模型发展了一种改进的具有转捩敏感性的低雷诺数湍流模型.针对LS模型的可实现性(realizability)问题和前缘滞止点湍动能预测过大的不足,模型进行了改进.改进模型只使用当地物理量,不需要求解壁面距离、y+和边界层积分参数.改进模型能够适用于广泛的流动,且容易应用到通用的计算流体动力学(CFD)程序中.对具有详细数据的零压力梯度平板转捩边界层T3A实验的模拟结果显示,改进模型能够预测转捩流动,并能对自由湍流变化给出合理的响应.
Based on Launder-Sharma (LS) low Reynolds number k-ε two-equation turbulence model, an improved low Reynolds number turbulence model with transition sensitivity was developed. For the realizability problem of LS model, The model only improves the model by using only the local physical quantities and does not need to solve the wall distance, y + and boundary layer integral parameters. The improved model can be applied to a wide range of flows and can be easily applied to the general purpose Computational Fluid Dynamics (CFD) program. The simulation results of the T3A experiment with zero-pressure gradient slab boundary layer with detailed data show that the improved model can predict the transition flow and give a reasonable response to the free turbulent flow changes.