ボンディ・ホイル・リットルトン降着流の不安定性の数値シミュレーション(宇宙・惑星(2),一般講演)

概要

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Stability of Bondi-Hoyle-Lyttleton type accretion flow is investigated numerically. Space dimension is either three or two (planer). The flow is assumed to be confined within a very thin accretion line so that we solve time dependent Euler equations of one space dimension. Steady solutions are first presented, and it is shown that there are infinitely many solutions. In order to decide the solution uniquely, we have to solve the time dependent equations. However, these flows were proved to be unstable to radial mode. By solving the equation numerically by recently proposed Boltzmann Particle Hydrodynamics method (BPH) by us, we show that the flow is violently unstable and the gas turns out to be a chain of blobs. The density distribution of gas shows sharp peaks/blobs and eventually ends up a train of saw shaped waves.
日本流体力学会の論文
2010-09-09