ウエダ　ヨシオ   Ueda Yoshio   上田　良夫    所属   追手門学院大学  理工学部 電気電子工学科    職種   教授
言語種別	英語
発行・発表の年月	2018/03
形態種別	論文
査読	査読あり
標題	A Coulomb collision model for weighted particle simulations with energy and momentum conservation
執筆形態	共著・編著（代表編著を除く）
掲載誌名	Contributions to Plasma Physics
掲載区分	国外
巻・号・頁	58(6-8),pp.451-456
著者・共著者	A. Tanaka,K. Ibano,T. Takizuka,Y. Ueda
概要	In PIC (particle-in-cell) simulations, the Takizuka–Abe (TA) model is widely used as a basic Coulomb collision model. For the weighted particle simulations, some collision models, such as the “rejection model” and the “merging model,” have been developed by expanding the TA model. These models do not conserve the total momentum or total energy, but can nearly conserve them, on average. We here develop a new model by expanding the TA model, which conserves both the total energy and total momentum in each time step. In the test simulations, the new model accomplishes the exact conservation of both energy and momentum. We examine the temperature relaxation and the velocity distribution function (VDF) for the model validation. In the merging model, temperature relaxation is inappropriate and the VDFs deviate from Maxwell distribution. In the new model, the temperature relaxation is correctly achieved and the VDFs are maintained Maxwellian.
DOI	10.1002/ctpp.201700121
ISSN	0863-1042/1521-3986