自己重力系の数値シミュレーションで発生する不可逆性の伝播特性(宇宙流体(2),一般講演)

概要

論文の詳細を見る
By means of molecular dynamics methods, numerical irreversibility due to round-off errors appearing in self-gravitating small N-body systems is investigated. As a typical self-gravitating system, the Antonov problem, i.e., a closed spherical system consisting of N point-particles, is considered. In order to examine the numerical irreversibility, a velocity inversion technique for a time-reversal operation is applied at a certain timing during the evolution of the system. Through the simulations, it is found that, under a restriction of constant initial potential energy, numerical irreversibility prevails more rapidly with decreasing initial kinetic energy. In other words, the lower the initial kinetic energy, the earlier the memory of the initial conditions is lost.
日本流体力学会の論文
2007-08-06