A diffusive information preservation method for small Knudsen number flows

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

	A diffusive information preservation method for small Knudsen number flows
	Fei F(费飞); Fan J(樊菁)
刊名	JOURNAL OF COMPUTATIONAL PHYSICS
	2013-06-15
通讯作者邮箱	jfan@imech.ac.cn
卷号	243 页码:179-193
关键词	DSMC IP Molecular diffusion Time step Cell size
ISSN号	0021-9991
通讯作者	Fan, J (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China.
产权排序	[Fei, Fei; Fan, Jing] Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China
中文摘要	The direct simulation Monte Carlo (DSMC) method is a powerful particle-based method for modeling gas flows. It works well for relatively large Knudsen (Kn) numbers, typically larger than 0.01, but quickly becomes computationally intensive as Kn decreases due to its time step and cell size limitations. An alternative approach was proposed to relax or remove these limitations, based on replacing pairwise collisions with a stochastic model corresponding to the Fokker–Planck equation [J. Comput. Phys., 229, 1077 (2010); J. Fluid Mech., 680, 574 (2011)]. Similar to the DSMC method, the downside of that approach suffers from computationally statistical noise. To solve the problem, a diffusion-based information preservation (D-IP) method has been developed. The main idea is to track the motion of a simulated molecule from the diffusive standpoint, and obtain the flow velocity and temperature through sampling and averaging the IP quantities. To validate the idea and the corresponding model, several benchmark problems with Kn ~ 10^(-3)–10^(-4) have been investigated. It is shown that the IP calculations are not only accurate, but also efficient because they make possible using a time step and cell size over an order of magnitude larger than the mean collision time and mean free path, respectively.
学科主题	稀薄气体力学
分类号	一类
收录类别	SCI
资助信息	National Natural Science Foundation of China [10921062]
原文出处	http://dx.doi.org/10.1016/j.jcp.2013.03.012
语种	英语
WOS记录号	WOS:000319050800012
公开日期	2013-06-27
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/47304]
专题	力学研究所_高温气体动力学国家重点实验室
推荐引用方式 GB/T 7714	Fei F,Fan J. A diffusive information preservation method for small Knudsen number flows[J]. JOURNAL OF COMPUTATIONAL PHYSICS,2013,243:179-193.
APA	费飞,&樊菁.(2013).A diffusive information preservation method for small Knudsen number flows.JOURNAL OF COMPUTATIONAL PHYSICS,243,179-193.
MLA	费飞,et al."A diffusive information preservation method for small Knudsen number flows".JOURNAL OF COMPUTATIONAL PHYSICS 243(2013):179-193.