初步MFiX-Exa代码的基准测试
Benchmarking of a preliminary MFiX-Exa code
摘要：
MFiX-Exa是劳伦斯伯克利国家实验室和国家能源技术实验室正在积极开发的一种新代码，是美国能源部Exascale计算项目的一部分。MFiX-Exa代码开发的起点是从现有的MFiX-DEM代码中提取基本的计算流体动力学（CFD）和离散单元法（DEM）功能，该代码被重构为AMReX代码架构，在本文中称为初步MFiX-Exa代码。虽然需要对代码库进行重大更改以生成具有艾级能力的应用程序，但对原始代码进行基准测试有助于为未来的开发建立一个有效的起点。在这项工作中，被认为是四个基准的情况下，每个对应的实验数据集的CFD-DEM验证的历史。我们发现，初步MFiX-Exa代码相比，毫不逊色经典MFiX-DEM模拟预测三个段塞/鼓泡流化床和喷动流化床。与实验数据的比较也是可接受的（在先前CFD-DEM基准测试和验证练习的预期精度内），其由几种测量技术组成，包括粒子跟踪测速法、正电子发射粒子跟踪和磁共振成像。最后，概述了计划的开发工作和潜在的基准案例，以验证新的MFiX-Exa功能。
英文摘要：
MFiX-Exa is a new code being actively developed at Lawrence Berkeley National Laboratory and the National Energy Technology Laboratory as part of the U.S. Department of Energy's Exascale Computing Project. The starting point for the MFiX-Exa code development was the extraction of basic computational fluid dynamic (CFD) and discrete element method (DEM) capabilities from the existing MFiX-DEM code which was refactored into an AMReX code architecture, herein referred to as the preliminary MFiX-Exa code. Although drastic changes to the codebase will be required to produce an exascale capable application, benchmarking of the originating code helps to establish a valid start point for future development. In this work, four benchmark cases are considered, each corresponding to experimental data sets with history of CFD-DEM validation. We find that the preliminary MFiX-Exa code compares favorably with classic MFiX-DEM simulation predictions for three slugging/bubbling fluidized beds and one spout-fluid bed. Comparison to experimental data is also acceptable (within accuracy expected from previous CFD-DEM benchmarking and validation exercises) which is comprised of several measurement techniques including particle tracking velocimetry, positron emission particle tracking and magnetic resonance imaging. The work concludes with an overview of planned developmental work and potential benchmark cases to validate new MFiX-Exa capabilities.
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