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Switching criteria for hybrid rarefied gas flow solvers
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Lockerby, Duncan A., Struchtrup, Henning and Reese, Jason M. (2008) Switching criteria for hybrid rarefied gas flow solvers. Rarefied Gas Dynamics: Proceedings of the 26th International Symposium on Rarefied Gas Dynamics, Vol.1084 . pp. 434-440. doi:10.1063/1.3076516 ISSN 0094-243X.
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Official URL: http://dx.doi.org/10.1063/1.3076516
Abstract
A set of local Knudsen numbers are defined, which are demonstrated to be more appropriate than conventional ones for the purposes of identifying gas flow non-equilibrium. The problematic area of choosing an appropriate switching criteria is addressed by adopting a local Knudsen number definition based on higher-order constitutive relations; the R13 equations are chosen. A procedure is then described that allows the estimation of the R13 local Knudsen number within a Navier-Stokes solver, and the efficacy of this as a switching criterion is tested within an illustrative hybrid BGK/Navier-Stokes procedure. For the test case investigated, the results from the hybrid procedure compare very well with the full BGK solution, and are obtained at a fraction (depending on the global Kn) of the computational cost.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics T Technology > TJ Mechanical engineering and machinery |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
Library of Congress Subject Headings (LCSH): | Fluid dynamics, Gas flow, Free molecular flow, Aerodynamics, Thermodynamic equilibrium | ||||
Journal or Publication Title: | Rarefied Gas Dynamics: Proceedings of the 26th International Symposium on Rarefied Gas Dynamics | ||||
Publisher: | American Institute of Physics | ||||
ISBN: | 978-0-7354-0615-5 | ||||
ISSN: | 0094-243X | ||||
Editor: | Abe, T | ||||
Official Date: | 2008 | ||||
Dates: |
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Volume: | Vol.1084 | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 434-440 | ||||
DOI: | 10.1063/1.3076516 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Version or Related Resource: | Paper presented at: 26th International Symposium on Rarefied Gas Dynmaics (RGD26), Kyoto, Japan, 20 Jun - 25 Jul, 2008. ; Lockerby, D.A., Reese, J.M. and Struchtrup, H. (2009). Switching criteria for hybrid rarefied gas flow solvers. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 465(2105), pp. 1581-1598. | ||||
Conference Paper Type: | Paper | ||||
Type of Event: | Conference | ||||
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