Application of the PODFS method to inlet turbulence generated using the digital filter technique
Application of the PODFS method to inlet turbulence generated using the digital filter technique
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PODFS 方法在数字滤波器技术产生的入口湍流中的应用
DOI：
10.1016/j.jcp.2020.109541
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发表时间：
2020
影响因子：
4.1
通讯作者：
Treleaven N
中科院分区：
文献类型：
--
作者：
Treleaven N
在过去的数字滤波技术已被用来成功地产生入流湍流的学术和工业相关的反应和非反应流。该方法的缺点包括需要在结构化网格上计算过滤器，并且在湍流长度尺度或过滤器宽度与网格间距相比较大的情况下可能需要极长的计算时间。一旦计算，流入数据可以被保存和重复使用，然而，对于每个新的计算，必须保存、复制和重新加载数万个时间步长的数据，并且如果时间步长被调整，则必须使用时间插值。新开发的PODFS（适当的正交分解傅立叶级数）方法使用适当的正交分解（POD），以压缩这个大的数据集到一个最佳选择的少数模式，以代表高能量湍流结构，而傅立叶级数表示的POD模式的时间分量意味着数据变得连续，周期性和灵活的时间步长。PODFS首先应用于一组使用数字滤波方法生成的流入数据，并用于模拟湍流平面射流与DNS模拟的结果进行比较。该方法的一个实际应用，然后证明它是用来产生进口湍流从时间平均的URANS轮廓的旋流稳定燃烧室的情况下。在这种情况下，两个PODFS模型线性组合，一个表示来自下游的声学强迫，另一个表示湍流波动。这突出了该方法的一个特点，即它能够使用两个或多个PODFS模型的线性相加来表示不同的流动现象。随后的LES计算表明，该方法的结果在正确的渗透的气流射流，而忽略进口湍流的结果在不正确的射流渗透深度。
In the past the digital filter technique has been used to successfully generate inflow turbulence for a number of academic and industrially relevant reacting and non-reacting flows. Weaknesses of the method include the requirement that the filter be computed over a structured mesh and can require extremely long computation times in cases where the turbulent length scales or filter widths are large as compared to the mesh spacing. Once computed, the inflow data may be saved and reused, however tens-of-thousands of time steps worth of data must be saved, copied and re-loaded into memory for each new computation and temporal interpolation must be used if the time step is adjusted. The newly developed PODFS (proper orthogonal decomposition Fourier series) method uses proper orthogonal decomposition (POD) to compress this large data set into a handful of modes that are optimally chosen to represent the high energy turbulent structures while a Fourier series representation of the temporal components of the POD modes means that the data becomes continuous, periodic and flexible in terms of time step. The PODFS is first applied to a set of inflow data generated using the digital filter method and used to simulate a turbulent planar jet with the results compared against a DNS simulation. A practical application of the method is then demonstrated where it is used to generate inlet turbulence from a time averaged URANS profile for a swirl stabilised combustor case. In this case, two PODFS models are linearly combined, one that represents acoustic forcing from downstream and one that represents turbulent fluctuations. This highlights a feature of the method which is its ability to represent different flow phenomena using the linear addition of two or more PODFS models. A subsequent LES calculation shows that the method results in the correct penetration of the airflow jets whilst neglecting the inlet turbulence results in the incorrect jet penetration depth.
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DOI：
10.2514/6.2006-3672
发表时间：
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