Further acceleration of multiscale simulation of rarefied gas flow via a generalized boundary treatment

Liu, Wei; Zhang, Yanbing; Zeng, Jianan; Wu, Lei

doi:10.1016/j.jcp.2024.112830

Cited by 7 publications

(1 citation statement)

References 52 publications

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“…In addition, this study can be further extended by considering also polyatomic gases in order to investigate any possible effects related to the internal degrees of freedom of the polyatomic gas molecules. Given the expected increase in the computational cost by adding more physical complexity to the modeling, a possible further acceleration of the simulation of the current flow set-up may be achieved by the use of the general synthetic iterative scheme (GSIS) [71].…”

Section: Discussionmentioning

confidence: 99%

Numerical Study of Rarefied Gas Flow in Diverging Channels of Finite Length at Various Pressure Ratios

Tantos,

Litovoli,

Teichmann

et al. 2024

Fluids

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In the present work, the gas flows through diverging channels driven by small, moderate, and large pressure drops are studied, considering a wide range of the gas rarefaction from free molecular limit through transition flow regime up to early slip regime. The analysis is performed using the Shakhov kinetic model, and applying the deterministic DVM method. The complete 4D flow problem is considered by including the upstream and downstream reservoirs. A strong effect of the channel geometry on the flow pattern is shown, with the distributions of the macroscopic quantities differing qualitatively and quantitatively from the straight channel flows. The mass flow rate data set from the complete solution is compared with the corresponding set obtained from the approximate kinetic methodology, which is based on the fully developed mass flow rate data available in the literature. In addition, the use of the end-effect approach significantly improves the applicability range of the approximate kinetic methodology. The influence of the wall temperature on the flow characteristics is also studied and is found to be strong in less-rarefied cases, with the mass flow rate in these cases being a decreasing function of the temperature wall. Overall, the present analysis is expected to be useful in the development and optimization of technological devices in vacuum and aerospace technologies.

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Section: Discussionmentioning

confidence: 99%