Wall‐modeled large‐eddy simulation in a finite element framework
Wall‐modeled large‐eddy simulation in a finite element framework
复制标题
有限元框架中的壁模型大涡模拟
DOI：
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发表时间：
2019
影响因子：
1.8
通讯作者：
O. Lehmkuhl
中科院分区：
文献类型：
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作者：
H. Owen;Georgios Chrysokentis;M. Avila;D. Mira;G. Houzeaux;R. Borrell;J. Cajas;O. Lehmkuhl
本工作研究了在有限元环境中进行大涡模拟的壁面建模的实现。它提供了一个详细的描述，如何使用的有限体积和有限差分社区的方法是适应有限元上下文。新的实现是简单和容易实现的经典有限元之一，但它提供了非常优越的上级的结果。在有限元中使用的典型方法中，网格不会一直延伸到壁，并且基于同一点处的速度在第一网格点处评估壁应力。相反，我们采用了有限差分中常用的方法，其中网格覆盖整个域，并且在壁网格点处获得壁应力，并在离开壁的第一个网格点处评估速度。该方法在Reτ=2003的湍流槽道流、中性大气边界层流和壁装驼峰流中进行了测试，与标准有限元方法相比，结果有显著改善。此外，我们还研究了评估远离壁的输入速度以及对壁模型输入应用时间滤波的效果。
This work studies the implementation of wall modeling for large‐eddy simulation in a finite element context. It provides a detailed description of how the approach used by the finite volume and finite differences communities is adapted to the finite element context. The new implementation is as simple and easy to implement as the classical finite element one, but it provides vastly superior results. In the typical approach used in finite elements, the mesh does not extend all the way to the wall, and the wall stress is evaluated at the first grid point, based on the velocity at the same point. Instead, we adopt the approach commonly used in finite differences, where the mesh covers the whole domain and the wall stress is obtained at the wall grid point, with the velocity evaluated at the first grid point off the wall. The method is tested in a turbulent channel flow at Reτ=2003, a neutral atmospheric boundary layer flow, and a flow over a wall‐mounted hump, with significant improvement in the results compared to the standard finite element approach. Additionally, we examine the effect of evaluating the input velocity further away from the wall, as well as applying temporal filtering on the wall‐model input.
二维驼峰上分离流的大涡模拟，有或无合成狭缝射流控制
DOI：
10.1007/s10494-009-9218-y
发表时间：
2009
期刊：
Flow, Turbulence and Combustion
影响因子：
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作者：
Avdis A
通讯作者：
Avdis A