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arXiv 2408.08129math.NAcs.DCcs.NAcs.PF
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使用非协调网格的高效可扩展大气动力学模拟

Efficient and scalable atmospheric dynamics simulations using non-conforming meshes

Giuseppe Orlando, Tommaso Benacchio, Luca Bonaventura

AI总结:

本研究提出基于DG空间离散与二阶IMEX-RK时间离散的h自适应非协调网格大气动力学求解器,验证了其在地形流动模拟中兼顾局部精度与大尺度计算效率,且局部细化不影响并行性能,实现高效可扩展模拟。

摘要:

我们展示了一款支持非协调网格细化的h自适应大气动力学求解器的大规模并行性能。该数值方法基于间断伽辽金(Discontinuous Galerkin, DG)空间离散格式,凭借数据局部性特性具备高度可扩展性;时间离散则采用二阶隐式-显式龙格-库塔(Implicit-Explicit Runge-Kutta, IMEX-RK)方法,尤其适用于低马赫数流动。针对地形上方流动的非协调网格模拟,可在不影响可在更粗网格上求解的大尺度流动的前提下,提升局部流动描述的精度。我们表明,局部细化过程对并行性能无显著影响,因此该框架可同时实现效率与可扩展性。

英文摘要:

We present the massively parallel performance of a $h$-adaptive solver for atmosphere dynamics that allows for non-conforming mesh refinement. The numerical method is based on a Discontinuous Galerkin (DG) spatial discretization, highly scalable thanks to its data locality properties, and on a second order Implicit-Explicit Runge-Kutta (IMEX-RK) method for time discretization, particularly well suited for low Mach number flows. Simulations with non-conforming meshes for flows over orography can increase the accuracy of the local flow description without affecting the larger scales, which can be solved on coarser meshes. We show that the local refining procedure has no significant impact on the parallel performance and, therefore, both efficiency and scalability can be achieved in this framework.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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