An LES Turbulent Inflow Generator using A Recycling and Rescaling Method.
An LES Turbulent Inflow Generator using A Recycling and Rescaling Method.
复制标题
使用回收和重新缩放方法的 LES 湍流流入发生器
DOI：
10.1007/s10494-016-9778-6
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
McGuirk JJ
中科院分区：
文献类型：
--
作者：
Xiao F;Dianat M;McGuirk JJ
本文描述了一种用于大涡模拟的紊流流入条件生成的循环和重标度方法。首先通过紊流边界层和紊流混合层的模拟验证了该方法的有效性。结果表明，仅以平均速度和湍流均方根水平（正应力）为输入规范，就能产生真实的自洽湍流结构。剪切应力和积分长度尺度的比较表明，该方法成功地生成了输入数据中未指定的湍流1点和2点相关性。利用该方法生成的湍流进口条件，可以较好地预测湍流边界层/混合层的增长速度。此外，该方法还可用于工业应用中常见的更复杂的进口边界流类型，例如产生非平衡湍流流入和展向非均匀流入。作为这种方法带来的好处的最后例证，模拟了一个充满液滴的混合层。由于回收/重标度方法捕获了真实的湍流结构，因此可以准确地再现分离器板尾缘下游湍流混合层开始处的近场液滴弥散。
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.
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