[P-EM15] 宇宙プラズマ理論・シミュレーション

[PEM15-09] 非相対論的プラズマ粒子シミュレーションのための全多重 Buneman-Boris 数値解法

*銭谷 誠司¹、加藤 恒彦² (1.神戸大学、2.国立天文台)

キーワード：プラズマ粒子シミュレーション、数値解法、Buneman-Boris法

We propose a family of numerical solvers for the nonrelativistic Newton–Lorentz equation in particle-in-cell (PIC) simulations. In our recent contribution (Zenitani & Kato 2018), we have subsycled the Lorentz-force part of the two-step Boris solver. In this contribution, we propose to subcycle the entire acceleration part of the two-step Boris solver. We derive a single-step formula for arbitrary subcycle number n. The new solver provides a second-order accuracy, but provides n**2 times smaller error than the conventional two-step solver in the velocity space. We will evaluate key properties of the new solver such as the force-free property and the computational cost.