Low speed/low rarefaction flow simulation in micro/nano cavity using DSMC method with small number of particles per cell

被引:5
作者
Amiri-Jaghargh, Ali [1 ,2 ]
Roohi, Ehsan [1 ,2 ]
Niazmand, Hamid [1 ,2 ]
Stefanov, Stefan [3 ]
机构
[1] Ferdowsi Univ Mashhad, Dept Mech Engn, Fac Engn, Mashhad, Iran
[2] Ferdowsi Univ Mashhad, Fac Engn, Dept Mech Engn, Mashhad, Iran
[3] Bulgarian Acad Sci, Inst Mech, Sofia, Bulgaria
来源
1ST EUROPEAN CONFERENCE ON GAS MICRO FLOWS (GASMEMS 2012) | 2012年 / 362卷
关键词
MONTE-CARLO METHOD; GAS; TRANSPORT; SLIP;
D O I
10.1088/1742-6596/362/1/012007
中图分类号
O59 [应用物理学];
学科分类号
摘要
The aim of this study is to extend the validity of the simplified Bernoulli-trials (SBT)/dual grid algorithm, newly proposed by Stefanov [1], as a suitable alternative of the standard collision scheme in the direct simulation Monte Carlo (DSMC) method, for solving low speed/low Knudsen number rarefied micro/nano flows. The main advantage of the SBT algorithm is to provide accurate calculations using much smaller number of particles per cell, i.e., < N > approximate to 1. Compared to the original development of SBT [1], we extend the application of the SBT scheme to the near continuum rarefied flows, i.e., Kn = 0.005, where NTC scheme requires a relatively large sample size. Comparing the results of the SBT/dual grid scheme with NTC, it is shown that the SBT/dual grid scheme could successfully predict the thermal pattern and hydrodynamics field as well as surface parameters such as velocity slip and temperature jump. Nonlinear flux-corrected transport algorithm (FCT) is also employed as a filter to extract the smooth solution from the noisy DSMC calculation for low-speed/low-Knudsen number DSMC calculations. The results indicate that combination of SBT/dual grid and FTC filtering can decrease the total sample size needed to reach smooth solution without losing significant accuracy.
引用
收藏
页数:13
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