Molecular simulation of small Knudsen number flows

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	Molecular simulation of small Knudsen number flows
	Fei F(费飞); Fan J(樊菁)
	2012
会议名称	28th International Symposium on Rarefied Gas Dynamics (RGD)
会议日期	JUL 09-13, 2012
会议地点	Zaragoza, SPAIN
关键词	DSMC IP molecular diffusion time step cell size RAREFIED-GAS FLOWS LOW-REYNOLDS-NUMBER STATISTICAL SIMULATION MONTE-CARLO FLAT-PLATE MODEL
卷号	1501
页码	864-871
通讯作者	Fei, F (reprint author), 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 similar to 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.
收录类别	CPCI
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
会议网址	http://dx.doi.org/10.1063/1.4769633
会议录	28TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 2012, VOLS. 1 AND 2
会议录出版者	AMER INST PHYSICS
会议录出版地	2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
学科主题	Engineering ; Aerospace; Astronomy & Astrophysics
语种	英语
ISSN号	0094-243X
ISBN号	978-0-7354-1115-9
内容类型	会议论文
源URL	[http://dspace.imech.ac.cn/handle/311007/46816]
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. Molecular simulation of small Knudsen number flows[C]. 见:28th International Symposium on Rarefied Gas Dynamics (RGD). Zaragoza, SPAIN. JUL 09-13, 2012.http://dx.doi.org/10.1063/1.4769633.