A new hierarchical particle-mesh code for very large scale cosmological N-body simulations
A new hierarchical particle-mesh code for very large scale cosmological N-body simulations
复制标题
用于超大规模宇宙 N 体模拟的新分层粒子网格代码
DOI：
10.1086/191380
复制
发表时间：
1989
影响因子：
8.7
通讯作者：
J. Villumsen
中科院分区：
文献类型：
--
作者：
J. Villumsen
用于宇宙结构引力演化的改进的三维分层粒子网格（HPM）N体代码已经开发和测试。该代码的基础是标准粒子网格 (PM) 代码，其中泊松方程通过快速傅里叶变换技术和周期性边界条件在关键网格上求解。多个子网格和父网格可以放入一个立方体中。来自父网格及其父网格等的字段被视为外部字段。对父网格没有反作用，粒子可以进入和退出子网格。在四网格代码中，动态范围可以扩展到长度 6000 和质量 11 个数量级。初始条件是使用 Zel'dovich 近似（1970）通过生长模式功率谱的随机相位实现来生成的。 HPM 代码比树代码和粒子-粒子-网格代码快得多，并且具有更大的动态范围。 28 参考文献
An improved three-dimensional hierarchical particle-mesh (HPM) N-body code for the gravitational evolution of structure in the universe has been developed and tested. The basis of the code is a standard particle-mesh (PM) code where Poisson's equation is solved on a critical grid with fast Fourier transform techniques and periodic boundary conditions. Several subgrids and father grids can fit into a cube. The fields from the father grid, and its father grid, and so on, are treated as external fields. There is no back-reaction to father grids, and particles can enter and exit subgrids. In a four grid code the dynamic range can be extended to 6000 in length and 11 orders of magnitude in mass. The initial conditions are generated with a random phase realization of the power spectrum of the growing mode using the Zel'dovich approximation (1970). The HPM code is much faster than tree codes and particle-particle-mesh codes, and has a much larger dynamic range. 28 refs.