在地球模拟器上使用阴阳网格模拟地球发电机和地幔对流
Geodynamo and mantle convection simulations on the Earth Simulator using the Yin-Yang grid
摘要：
我们开发了基于阴阳网格的有限差分程序，用于地球发电机模拟和地幔对流模拟。阴阳网格是由两个完全相同的子网格组成的球面重叠网格。阴阳网格的网格配置的内在简单性使我们能够在大规模并行超级计算机上开发高度优化的模拟代码。阴阳地球发电机代码在地球模拟器上使用4096个处理器实现了15.2 Tflops。这代表了理论峰值性能的46%。阴阳地幔代码使我们能够进行地幔对流模拟在现实的制度与瑞利数$10^7$，包括强烈的温度依赖的粘度与空间对比度高达$10^6$。
英文摘要：
We have developed finite difference codes based on the Yin-Yang grid for the geodynamo simulation and the mantle convection simulation. The Yin-Yang grid is a kind of spherical overset grid that is composed of two identical component grids. The intrinsic simplicity of the mesh configuration of the Yin-Yang grid enables us to develop highly optimized simulation codes on massively parallel supercomputers. The Yin-Yang geodynamo code has achieved 15.2 Tflops with 4096 processors on the Earth Simulator. This represents 46% of the theoretical peak performance. The Yin-Yang mantle code has enabled us to carry out mantle convection simulations in realistic regimes with a Rayleigh number of $10^7$ including strongly temperature-dependent viscosity with spatial contrast up to $10^6$.
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