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arXiv 2402.09324physics.plasm-phphysics.comp-ph
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回旋动理学-MHD高能粒子模拟代码的开发 第一部分：MHD版本

Development of a gyrokinetic-MHD energetic particle simulation code Part I: MHD version

P. Y. Jiang, Z. Y. Liu, S. Y. Liu, J. Bao, G. Y. Fu

备注：
17 pages, 38 figures
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AI总结：

开发了基于初值方法的MHD代码GMEC_I，用于模拟托卡马克等离子体物理，作为回旋动理学-MHD高能粒子模拟代码系列的基础，并通过基准测试验证了其有效性。

摘要：

基于初值方法的新磁流体力学（MHD）代码GMEC_I已被开发出来，用于模拟托卡马克等离子体中的各种MHD物理，作为回旋动理学-MHD高能粒子模拟代码（GMEC）系列的MHD基础。GMEC_I求解构成物理复杂性层次的多级简化MHD模型，这为跨代码验证和识别托卡马克几何中的关键物理效应提供了便利。使用场对齐坐标来高效表示模式结构。使用高阶有限差分法进行空间离散化。使用移位度量方法来保证数值稳定性。代码中物理方程的离散展开形式是使用编译时符号求解器（CSS）符号化生成的，该求解器专门开发用于降低MHD方程高阶有限差分形式的复杂性。已实现先进的计算技术以优化内存访问和代码并行化，使用Thread Building Block（TBB）和Message Passing Interface（MPI）均显示出良好的效率。展示了GMEC_I与特征值代码MAS之间针对有和无抗磁性漂移效应的气球模以及撕裂模的基准测试，结果表现出极好的一致性。

英文摘要：

A new magnetohydrodynamics (MHD) code based on initial value approach, GMEC_I, has been developed for simulating various MHD physics in tokamak plasmas, as the MHD foundation of the gyrokinetic-MHD energetic particle simulation code (GMEC) family. GMEC_I solves multi-level reduced-MHD models that form a hierarchy of physics complexity, which provide conveniences for the cross-code verification and the identification of key physics effect in tokamak geometry. The field-aligned coordinates are used to represent mode structure efficiently. High-order finite difference methods are used for spatial discretization. The shifted metric methods are used for numerical stability. The discrete expansion forms of physics equations in the code are generated symbolically using the compile-time symbolic solver (CSS), which is specifically developed to reduce the complexity of the high-order finite difference form of the MHD equations. Advanced computational techniques have been implemented for optimizing memory access and code parallelization that show a good efficiency using both Thread Building Block (TBB) and Message Passing Interface (MPI). Benchmarks between GMEC_I and the eigenvalue code MAS are presented for ballooning modes without and with diamagnetic drift effects, and tearing modes, which show excellent agreements.

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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