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首页> 外文期刊>The Astrophysical Journal. Supplement Series >GAMERA: A Three-dimensional Finite-volume MHD Solver for Non-orthogonal Curvilinear Geometries
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GAMERA: A Three-dimensional Finite-volume MHD Solver for Non-orthogonal Curvilinear Geometries

机译：Gamera：非正交曲线几何形状的三维有限卷MHD求解器

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摘要

Efficient simulation of plasmas in various contexts often involves the use of meshes that conform to the intrinsic geometry of the system under consideration. We present here a description of a new magnetohydrodynamic code, GAMERA (Grid Agnostic MHD for Extended Research Applications), designed to combine geometric flexibility with high-order spatial reconstruction and constrained transport to maintain the divergence-free magnetic field. GAMERA carries on the legacy of its predecessor, the LFM (Lyon-Fedder-Mobarry), a research code whose use in space physics has spanned three decades. At the time of its initial development, the LFM code had a number of novel features: eighth-order centered spatial differencing, the Partial Donor Cell Method limiter for shock capturing, a non-orthogonal staggered mesh with constrained transport, and conservative averaging-reconstruction for axis singularities. The capability to handle multiple ion species was also added later. GAMERA preserves the core numerical philosophy of LFM while also incorporating numerous algorithmic and computational improvements. The upgrades in the numerical schemes include accurate grid metric calculations using high-order Gaussian quadrature techniques, high-order upwind reconstruction, non-clipping options for interface values, and improved treatment of axis singularities. The improvements in the code implementation include the use of data structures and memory access patterns conducive to aligned vector operations and the implementation of hybrid parallelism, using MPI and OMP. GAMERA is designed to be a portable and easy-to-use code that implements multidimensional MHD simulations in arbitrary non-orthogonal curvilinear geometries on modern supercomputer architectures.
机译：各种情况下的等离子体的有效模拟通常涉及使用符合所考虑的系统的内在几何形状的网格。我们在这里展示了一种新的磁力正动力学代码，Gamera（Grid Andnostic MHD用于扩展研究应用的网格），旨在将几何灵活性与大阶空间重建和约束传输相结合，以维持无分离性的磁场。 Gamera在其前任的遗产，LFM（Lyon-Fedder-Mobarry），这是一个在空间物理学中使用的研究代码已经跨过三十年。在其初始开发时，LFM代码具有许多新颖特征：第八阶中心空间差异，部分供体细胞方法限制器用于冲击捕获，非正交交错的网眼具有约束的传输，保守平均重建对于轴奇点。还在后面加入处理多种离子物种的能力。 Gamera保留了LFM的核心数值哲学，同时还包含了许多算法和计算改进。数值方案中的升级包括使用高阶高斯正交技术，高阶Unwind重建，用于接口值的非剪辑选项的准确网格度量计算，以及改进的轴奇异性处理。代码实现的改进包括使用使用MPI和OMP对准传感器操作和混合并行性的对准传感器和实施的数据结构和存储器访问模式。 Gamera旨在成为一种便携式且易于使用的代码，用于在现代超级计算机架构上的任意非正交曲线几何形状中实现多维MHD仿真。

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