Intercomparison of Subgrid Scale Models in Large-Eddy Simulation of Sunset Atmospheric Boundary Layer Turbulence: Computational Aspects

Abstract

We perform a comparison study of different subgrid scale closures in large-eddy simulations (LES) of the non-stationary boundary layer dynamics during the evening transition. In particular, we consider LES models supplemented with the dynamic procedure, which allows the variation of subgrid closure parameters (Smagorinsky coefficient and subgrid Prandtl number) in space and time and a recently proposed model based on the minimum dissipation approach. As a reference we present the results for the classical Smagorinsky subgrid model. We address the grid sensitivity of results and computational performance of LES models on different CPU architectures, including Intel Xeon, AMD EPYC, and ARM-based Kunpeng processors.