文章基本信息

标题：Separating Physics and Dynamics Grids for Improved Computational Efficiency in Spectral Element Earth System Models
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作者：Walter M. Hannah ; Andrew M. Bradley ; Oksana Guba 等
期刊名称：Journal of Advances in Modeling Earth Systems
电子版ISSN：1942-2466
出版年度：2021
卷号：13
期号：7
页码：e2020MS002419
DOI：10.1029/2020MS002419
出版社：John Wiley & Sons, Ltd.
摘要：Previous studies have shown that atmospheric models with a spectral element grid can benefit from putting physics calculations on a relatively coarse finite volume grid. Here we demonstrate an alternative high-order, element-based mapping approach used to implement a quasi-equal-area, finite volume physics grid in E3SM. Unlike similar methods, the new method in E3SM requires topology data purely local to each spectral element, which trivially allows for regional mesh refinement. Simulations with physics grids defined by 2 × 2, 3 × 3, and 4 × 4 divisions of each element are shown to verify that the alternative physics grid does not qualitatively alter the model solution. The model performance is substantially affected by the reduction of physics columns when using the 2 × 2 grid, which can increase the throughput of physics calculations by roughly 60%–120% depending on whether the computational resources are configured to maximize throughput or efficiency. A pair of regionally refined cases are also shown to highlight the refinement capability.
关键词：computational efficiency;E3SM;effective resolution;grid remap methods