Implementation of neutralizing fields for particle-particle simulations using like charges

doi:10.1017/S002237782100060X

CORC > 力学研究所 > 中国科学院力学研究所 > 高温气体动力学国家重点实验室

	Implementation of neutralizing fields for particle-particle simulations using like charges
	Zhao, Yinjian 3,4; Cui, Chen 4; Zhang, Yanan 2; Hu Y(胡远)1
刊名	JOURNAL OF PLASMA PHYSICS
	2021-07-07
卷号	87 期号:3 页码:16
关键词	plasma simulation strongly coupled plasmas plasma dynamics
ISSN号	0022-3778
DOI	10.1017/S002237782100060X
通讯作者	Hu, Yuan(yhu@imech.ac.cn)
英文摘要	The particle-particle (PP) model has a growing number of applications in plasma simulations, because of its high accuracy of solving Coulomb collisions. One of the main issues restricting the practical use of the PP model is its large computational cost, which is now becoming acceptable thanks to state-of-art parallel computing techniques. Another issue is the singularity that occurs when two particles are too close. The most effective approach of avoiding the singularity would be to simulate particles with only like charges plus a neutralizing field, such that the short-range collisions are equivalent to those of using unlike charges. In this paper, we introduce a way of adding the neutralizing field by using the analytical solution of the electric field in the domain filled with uniformly distributed charges, for applications with homogeneous and quasi-neutral plasmas under a reflective boundary condition. Two most common Cartesian domain geometries, cubic and spherical, are considered. The model is verified by comparing simulation results with an analytical solution of an electron-ion temperature relaxation problem, and a corresponding simulation using unlike charges. In addition, it is found that a PP simulation using like charges can achieve a significant speed-up of 100 compared with a corresponding simulation using unlike charges, due to the capability of using larger time steps while maintaining the same energy conservation.
分类号	Q3
资助项目	LHD Youth Innovation Fund from the State Key Laboratory of High Temperature Gas Dynamics[LHD2019CX12]
WOS关键词	TEMPERATURE RELAXATION ; COEFFICIENTS ; COLLISIONS
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000670336600001
资助机构	LHD Youth Innovation Fund from the State Key Laboratory of High Temperature Gas Dynamics
其他责任者	Hu, Yuan
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/87006]
专题	力学研究所_高温气体动力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China 2.Arizona State Univ, Tempe, AZ 85281 USA; 3.Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA; 4.Univ Southern Calif, Los Angeles, CA 90007 USA;
推荐引用方式 GB/T 7714	Zhao, Yinjian,Cui, Chen,Zhang, Yanan,et al. Implementation of neutralizing fields for particle-particle simulations using like charges[J]. JOURNAL OF PLASMA PHYSICS,2021,87(3):16.
APA	Zhao, Yinjian,Cui, Chen,Zhang, Yanan,&胡远.(2021).Implementation of neutralizing fields for particle-particle simulations using like charges.JOURNAL OF PLASMA PHYSICS,87(3),16.
MLA	Zhao, Yinjian,et al."Implementation of neutralizing fields for particle-particle simulations using like charges".JOURNAL OF PLASMA PHYSICS 87.3(2021):16.