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Time Scales and Tidal Effects in Minor Mergers

Chinese Journal of Astronomy and Astrophysics 2003年第5期3卷 395-409页

作者： Yu Lu and Jian-Yan WeiNational Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 luyu National Astronomical Observatories Chinese Academy of Sciences

We use controlled N-body simulation to investigate the dynamical processes(dynamical friction, tidal truncation, etc.) involved in the merging of small satellites into biggerhalos. We confirm the validity of some analytic formulae proposed earlier based on simplearguments. For rigid satellites represented by softened point masses, the merging time scale dependson both the orbital shape and concentration of the satellite. The dependence on orbital ellipticityis roughly a power law, as suggested by Lacey & Cole, and the dependence on satellite concentrationis similar to that proposed by White. When merging satellites are represented by non-rigid objects,Tidal effects must be considered. We found that material beyond the tidal radius are stripped *** decrease in the satellite mass might mean an increase in the merging time scale, but in fact,the merging time is decreased, because the stripped-off material carries away a proportionatelylarger amount of of orbital energy and angular momentum.

关键词： cosmology: dark matter galaxies: kinematics and dynamics galaxies:structure galaxies: interactions numerical methods

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PHoToNs–A parallel heterogeneous and threads oriented code for cosmological N-body simulation

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Research in Astronomy and Astrophysics 2018年第6期18卷 7-16页

作者： Qiao Wang Zong-Yan Cao Liang Gao Xue-Bin Chi Chen Meng Jie Wang Long Wang Key Laboratory of Computational Astrophysics National Astronomical Observatories Chinese Academy of Sciences Supercomputing Center Computer Network Information Center Chinese Academy of Sciences Institute for Computational Cosmology Department of Physics Durham University Science Laboratories System Department Baidu Group Ltd.

We introduce a new code for cosmological simulations, PHo To Ns, which incorporates features for performing massive cosmological simulations on heterogeneous high performance computer(HPC) systems and threads oriented programming. PHo To Ns adopts a hybrid scheme to compute gravitational force, with the conventional Particle-Mesh(PM) algorithm to compute the long-range force,the Tree algorithm to compute the short range force and the direct summation Particle-Particle(PP) algorithm to compute gravity from very close particles. A self-similar space filling a Peano-Hilbert curve is used to decompose the computing domain. Threads programming is advantageously used to more flexibly manage the domain communication, PM calculation and synchronization, as well as Dual Tree Traversal on the CPU+MIC platform. PHo To Ns scales well and efficiency of the PP kernel achieves68.6% of peak performance on MIC and 74.4% on CPU platforms. We also test the accuracy of the code against the much used Gadget-2 in the community and found excellent agreement.

关键词： methods: numerical galaxies: interactions dark matter

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