A short note on a 3D spectral analysis for turbulent flows on unstructured meshes
A short note on a 3D spectral analysis for turbulent flows on unstructured meshes
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DOI：
10.1016/j.jcp.2022.111804
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Panagiotis Tsoutsanis;X. Nogueira;Lin Fu
中科院分区：
文献类型：
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作者：
Panagiotis Tsoutsanis;X. Nogueira;Lin Fu
我们提出了两种技术，用于计算能量谱的三维非结构化网格是一致的，在不同的元素类型。这些技术在评估隐式大涡模拟（iLES）的耗散特性和几种流行的非线性高阶方法的适用性时特别有用。数值实验表明，几种类型的单元的性能为iLES的泰勒-格林涡，其中一个显着不同的耗散和分散机制，每种类型的元素被揭示。能谱结果取决于获得它们所选择的技术，因此还包括文献中的其他既定技术进行比较，以进一步分析它们的相似性和差异性。这些技术可以是一个不可分割的工具，调整和校准的非线性高阶方法，可以受益于显式和隐式大涡模拟（LES）。
We propose two techniques for computing the energy spectra for 3D unstructured meshes that are consistent across different element types. These techniques can be particularly useful when assessing the dissipation characteristics and the suitability of several popular non-linear high-order methods for implicit large-eddy simulations (iLES). Numerical experiments demonstrate the performance of several element types for iLES of the Taylor-Green vortex, where a significantly different dissipation and dispersion mechanism for each element type is revealed. The energy spectra results are dependent on the technique selected for obtaining them, therefore an additional established technique from the literature is also included for comparison to further analyse their similarities and their differences. These techniques can be an integral tool for the tuning and calibration of non-linear high-order methods that can benefit both explicit and implicit large-eddy simulations (LES).