The present paper describes a recycling and rescaling method for generating turbulent inflow conditions for Large Eddy Simulation. The method is first validated by simulating a turbulent boundary layer and a turbulent mixing layer. It is demonstrated that, with input specification of mean velocities and turbulence rms levels (normal stresses) only, it can produce realistic and self-consistent turbulence structures. Comparison of shear stress and integral length scale indicates the success of the method in generating turbulent 1-point and 2-point correlations not specified in the input data. With the turbulent inlet conditions generated by this method, the growth rate of the turbulent boundary/mixing layer is properly predicted. Furthermore, the method can be used for the more complex inlet boundary flow types commonly found in industrial applications, which is demonstrated by generating non-equilibrium turbulent inflow and spanwise inhomogeneous inflow. As a final illustration of the benefits brought by this approach, a droplet-laden mixing layer is simulated. The dispersion of droplets in the near-field immediately downstream of the splitter plate trailing edge where the turbulent mixing layer begins is accurately reproduced due to the realistic turbulent structures captured by the recycling/rescaling method.

中文翻译：

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使用回收和重新缩放方法的 LES 湍流流入发生器

本文描述了一种为大涡模拟生成湍流流入条件的再循环和重新缩放方法。该方法首先通过模拟湍流边界层和湍流混合层来验证。结果表明，仅使用平均速度和湍流均方根水平（法向应力）的输入规范，它可以产生真实且自洽的湍流结构。剪切应力和积分长度尺度的比较表明该方法在生成输入数据中未指定的湍流 1 点和 2 点相关性方面是成功的。通过该方法产生的湍流入口条件，可以正确预测湍流边界/混合层的增长速率。此外，该方法可用于工业应用中常见的更复杂的入口边界流类型，通过产生非平衡湍流流入和展向非均匀流入证明了这一点。作为这种方法带来的好处的最后说明，模拟了一个充满液滴的混合层。由于回收/重新缩放方法捕获的真实湍流结构，在湍流混合层开始处的分流板后缘紧下游的近场中液滴的分散被准确地再现。