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A diffusive information preservation method for small Knudsen number flows
Fei F(费飞); Fan J(樊菁); Fan, J (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China.
Source PublicationJOURNAL OF COMPUTATIONAL PHYSICS
2013-06-15
Volume243Pages:179-193
ISSN0021-9991
AbstractThe 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.
KeywordDsmc Ip Molecular Diffusion Time Step Cell Size
Subject Area稀薄气体力学
URL查看原文
Indexed BySCI
Language英语
WOS IDWOS:000319050800012
Funding OrganizationNational Natural Science Foundation of China [10921062]
DepartmentLHD微尺度和非平衡流动
Classification一类
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/47304
Collection高温气体动力学国家重点实验室
Corresponding AuthorFan, J (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Fei F,Fan J,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,&Fan, J .(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.
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