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有读书笔记GADGET: A code for collisionless and gasdynamical cosmological simulations

ColdThunder 添加于 2010-8-4 10:58 | 2097 次阅读 | 0 个评论

  •  作 者

    Springel V, Yoshida N, White SDM

  •  摘 要

    We describe the newly written code GADGET which is suitable both for cosmological simulations of structure formation and for the simulation of interacting galaxies. GADGET evolves self-gravitating collisionless fluids with the traditional N-body approach, and a collisional gas by smoothed particle hydrodynamics. Along with the serial version of the code, we discuss a parallel version that has been designed to run on massively parallel supercomputers with distributed memory. While both versions use a tree algorithm to compute gravitational forces, the serial version of GADGET can optionally employ the special-purpose hardware GRAPE instead of the tree. Periodic boundary conditions are supported by means of an Ewald summation technique. The code uses individual and adaptive timesteps for all particles, and it combines this with a scheme for dynamic tree updates. Due to its Lagrangian nature, GADGET thus allows a very large dynamic range to be bridged, both in space and time. So far, GADGET has been successfully used to run simulations with up to 7.5e7 particles, including cosmological studies of large-scale structure formation, high-resolution simulations of the formation of clusters of galaxies, as well as workstation-sized problems of interacting galaxies. In this study, we detail the numerical algorithms employed, and show various tests of the code. We publically release both the serial and the massively parallel version of the code.

  •  详细资料

    • 关键词: astro-ph
    • 文献种类:期刊
    • 期刊缩写: New Astron.
    • 期卷页: 2001年  第6卷
    • 地址: Springel: MPA, CfA; Yoshida: MPA; White: MPA
    • 备注:arXiv:astro-ph/0003162v3; 32 pages, 14 figures, replaced to match published version in New Astronomy. For download of the code, see http://www.mpa-garching.mpg.de/gadget (new version 1.1 available); Journal Ref: New Astron.6:79,2001

  •  标 签

    hydrodynamic  simulation 

  • 相关链接 DOI URL 

  •  ColdThunder 的文献笔记  订阅

    • 5.1 Timestep criterion，比较三种timestep判据（37）（38）（39），大halo的核，动力学timestep判据最好，小halo，用局域加速度判据好，所以取两者比较小的那个。
    • 5.6 Integration in comoving coordinates，给出共动坐标下以a为时间，w为速度，x为位置的演化方程（59）－（62）。
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