We assess the ability of three different approaches based on high-order discontinuous Galerkin methods to simulate under-resolved turbulent flows. The capabilities of the mass conserving mixed stress method as structure resolving large eddy simulation solver are examined. A comparison of a variational multiscale model to no-model or an implicit model approach is presented via numerical results. In addition, we present a novel approach for turbulent modeling in wall-bounded flows. This new technique provides a more accurate representation of the actual subgrid scales in the near wall region and gives promising results for highly under-resolved flow problems. In this paper, the turbulent channel flow and periodic hill flow problem are considered as benchmarks for our simulations.
翻译:我们评估了三种不同方法的能力,这些方法基于高分级不连续的Galerkin方法,以模拟未充分解决的动荡流。我们研究了大规模保护混合压力法作为解决大型Eddy模拟求解器的结构的能力。通过数字结果,将多尺度模型与不模型或隐含模型方法进行比较。此外,我们提出了一种新颖方法,用以模拟墙上流动的动荡建模。这种新技术更准确地反映了近墙区的实际亚电网规模,为高度未解决的流量问题提供了有希望的结果。本文将动荡通道流量和定期山地流动问题视为我们模拟的基准。