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Development and Validation of a New Formulation of Hybrid Temporal Large Eddy Simulation
Flow, Turbulence and Combustion ( IF 2.0 ) Pub Date : 2021-05-08 , DOI: 10.1007/s10494-021-00264-z
Vladimir Duffal , Benoît de Laage de Meux , Rémi Manceau

Hybrid RANS–LES approaches have aroused interest for years since they provide unsteady information at a reduced numerical cost compared to LES. In the hybrid context, the use of temporal filtering, to control the energy partition between resolved and modeled scales, ensures a consistent bridging between RANS and LES models. In this regard, a new formulation of Hybrid Temporal Large Eddy Simulation (HTLES) is developed, aiming at improving the theoretical foundation of the model associated with an eddy-viscosity closure. The analytical development is performed, applying the Hybrid-Equivalence criterion, and the model is calibrated in decaying isotropic turbulence. In addition, an upgraded version of the approach is proposed to improve the behavior of the model in near-wall regions, introducing a two-fold shielding function and an internal consistency constraint to provide a suitable control of the RANS-to-LES transition. Applying HTLES to the k\(\omega\) SST model, the validation process is carried out on channel and periodic-hill flows, over a range of grids and Reynolds numbers. The predictive accuracy and the robustness to grid coarsening are assessed in these cases, ensuring that HTLES offers a cost-saving alternative to LES.



中文翻译:

混合时态大涡模拟新公式的开发与验证

混合RANS-LES方法引起了人们的兴趣,因为与LES相比,它们以较低的数值成本提供了不稳定的信息。在混合环境中,使用时间滤波来控制解析尺度和建模尺度之间的能量分配,可以确保RANS模型和LES模型之间的桥连一致。在这方面,开发了一种新的混合时间大涡模拟(HTLES)公式,旨在改善与涡粘性闭合相关的模型的理论基础。应用混合等效准则进行分析开发,并在衰减的各向同性湍流中对模型进行校准。此外,还提出了该方法的升级版本,以改善模型在近墙区域的行为,引入了双重屏蔽功能和内部一致性约束,以提供对RANS到LES过渡的适当控制。将HTLES应用于k\(\ omega \) SST模型,在一定范围的网格和雷诺数范围内,对通道和周期性坡道流进行验证过程。在这些情况下,对网格粗化的预测准确性和鲁棒性进行了评估,从而确保HTLES提供了LES节省成本的替代方案。

更新日期:2021-05-09
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