Separating Physics and Dynamics Grids for Improved Computational Efficiency in Spectral Element Earth System Models
Separating Physics and Dynamics Grids for Improved Computational Efficiency in Spectral Element Earth System Models
复制标题
分离物理和动力学网格以提高光谱元素地球系统模型的计算效率
DOI：
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发表时间：
2021
影响因子：
6.8
通讯作者：
J. Wolfe
中科院分区：
文献类型：
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作者：
W. Hannah;A. Bradley;O. Guba;Q. Tang;J. Golaz;J. Wolfe
先前的研究表明，将物理计算放在相对粗糙的有限体积网格上可以使具有光谱元素网格的大气模型受益。在这里，我们展示了一种替代的高阶、基于元素的映射方法，用于在E3SM中实现准等面积、有限体积的物理网格。与类似的方法不同，E3SM中的新方法需要的拓扑数据纯粹是每个光谱元素的局部数据，这使得区域网格细化成为可能。通过对每个元素进行2 × 2、3 × 3和4 × 4划分定义的物理网格进行仿真，验证了替代物理网格不会从质量上改变模型解。当使用2 × 2网格时，模型性能受到物理列减少的显著影响，这可以将物理计算的吞吐量提高大约60%-120%，具体取决于计算资源是否配置为最大化吞吐量或效率。还显示了一对区域细化的案例，以突出细化能力。
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.