Application of wall-models to discontinuous Galerkin LES
Application of wall-models to discontinuous Galerkin LES
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DOI：
10.1063/1.4998977
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发表时间：
2017-08
影响因子：
4.6
通讯作者：
A. Frère;C. C. D. Wiart-C.;K. Hillewaert;P. Chatelain;G. Winckelmans
中科院分区：
文献类型：
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作者：
A. Frère;C. C. D. Wiart-C.;K. Hillewaert;P. Chatelain;G. Winckelmans
壁面分辨大涡模拟（LES）仍然局限于中等雷诺数的流动，由于捕获边界层的内部所需的高计算成本。壁面模拟大涡模拟（WMLES）通过模拟近壁层，提供了更经济的大涡模拟。基于壁函数的WMLES求解LES方程直到壁，其中粗网格分辨率基本上使计算欠分辨率。这使得WMLES的精度对数值方法的行为非常敏感。因此，关于使用和实现WMLES的最佳实践规则不能直接从一种方法转移到另一种方法，无论离散化方法的类型如何。虽然许多研究提出了使用WMLES的指导方针，但缺乏对非连续有限元高阶方法的了解。顺便说一句，这些方法越来越多地使用在非结构化网格上的高精度和其强大的计算效率。目前的PA…
Wall-resolved Large-Eddy Simulations (LES) are still limited to moderate Reynolds number flows due to the high computational cost required to capture the inner part of the boundary layer. Wall-modeled LES (WMLES) provide more affordable LES by modeling the near-wall layer. Wall function-based WMLES solve LES equations up to the wall, where the coarse mesh resolution essentially renders the calculation under-resolved. This makes the accuracy of WMLES very sensitive to the behavior of the numerical method. Therefore, best practice rules regarding the use and implementation of WMLES cannot be directly transferred from one methodology to another regardless of the type of discretization approach. Whilst numerous studies present guidelines on the use of WMLES, there is a lack of knowledge for discontinuous finite-element-like high-order methods. Incidentally, these methods are increasingly used on the account of their high accuracy on unstructured meshes and their strong computational efficiency. The present pa...