2001/05/06 by Hideki Yahagi, Yuzuru Yoshii · 1 citation
Physics and Astronomy · #Adaptive mesh refinement #Algorithm #Astrophysics #Astrophysics and Star Formation Studies #Code (set theory) #Computational science #Computer graphics (images) #Computer science #Finite element method #Galaxies: Formation, Evolution, Phenomena #Geology #Halo #Materials science #Mechanics #Mesh generation #Parallel computing #Particle (ecology) #Physics #Polygon mesh #Programming language #RADIUS #Range (aeronautics) #Scientific Research and Discoveries #Smoothed-particle hydrodynamics #astro-ph
paper · pdf · doi:10.1086/322457
published as Astrophys.J. 558 (2001) 463-475 · Accepted for publication in ApJ. (17 pages, 18 figures)
arxiv created 2001/05/06 · openalex publication_date 2001/09/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We have developed a simulation code with the techniques that enhance both spatial and time resolution of the particle-mesh (PM) method, for which the spatial resolution is restricted by the spacing of structured mesh. The adaptive-mesh refinement (AMR) technique subdivides the cells that satisfy the refinement criterion recursively. The hierarchical meshes are maintained by the special data structure and are modified in accordance with the change of particle distribution. In general, as the resolution of the simulation increases, its time step must be shortened and more computational time is required to complete the simulation. Since the AMR enhances the spatial resolution locally, we reduce the time step locally also, instead of shortening it globally. For this purpose, we used a technique of hierarchical time steps (HTS), which changes the time step, from particle to particle, depending on the size of the cell in which particles reside. Some test calculations show that our implementation of AMR and HTS is successful. We have performed cosmological simulation runs based on our code and found that many of halo objects have density profiles that are well fitted to the universal profile proposed in 1996 by Navarro, Frenk, & White over the entire range of their radius.