Jun, Eunji (2019) Cubic Fokker-Planck-DSMC hybrid method for diatomic rarefied gas flow through a slit and an orifice. Vacuum, 159, pp. 125-133. Elsevier. DOI: 10.1016/j.vacuum.2018.10.028 ISSN 0042-207X
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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0042207X18315781
Abstract
Fokker-Planck kinetic models have been devised as an approximation of the Boltzmann collision operator. Cubic Fokker-Planck-DSMC hybrid method is employed to simulate the diatomic gas flow through a thin slit and a thin orifice. Pressure driven nitrogen expansion gas flows with two different pressure ratios are investigated at Knudsen number 0.001. The DSMC method is physically accurate for all flow regime; however it is computationally expensive in high density or near continuum regions. The Fokker-Planck-DSMC hybrid scheme employs DSMC in rarefied regions and Fokker-Planck method in near continuum flow regions for an efficient and accurate solution. Numerical procedures of the cubic Fokker-Planck method are implemented within the framework of an existing DSMC-solver, SPARTA. The Fokker-Planck-DSMC hybrid solution reproduces pure DSMC solution with improved computational efficiency up to a factor of five for vacuum flow through a thin orifice. In addition, breakdown of translational equilibrium is investigated. Domain criterion of FP-DSMC is safely smaller than Bird's breakdown criterion.
Item URL in elib: | https://elib.dlr.de/132340/ | ||||||
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Document Type: | Article | ||||||
Title: | Cubic Fokker-Planck-DSMC hybrid method for diatomic rarefied gas flow through a slit and an orifice | ||||||
Authors: |
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Date: | January 2019 | ||||||
Journal or Publication Title: | Vacuum | ||||||
Refereed publication: | Yes | ||||||
Open Access: | No | ||||||
Gold Open Access: | No | ||||||
In SCOPUS: | Yes | ||||||
In ISI Web of Science: | Yes | ||||||
Volume: | 159 | ||||||
DOI : | 10.1016/j.vacuum.2018.10.028 | ||||||
Page Range: | pp. 125-133 | ||||||
Editors: |
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Publisher: | Elsevier | ||||||
ISSN: | 0042-207X | ||||||
Status: | Published | ||||||
Keywords: | Rarefied gas dynamics; Vacuum flows; DSMC; Diatomic gas flow; Fokker-Planck-DSMC hybrid; SPARTA | ||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||
HGF - Program: | Space | ||||||
HGF - Program Themes: | Space Transport | ||||||
DLR - Research area: | Raumfahrt | ||||||
DLR - Program: | R RP - Raumtransport | ||||||
DLR - Research theme (Project): | R - Wiederverwendbare Raumfahrtsysteme und Antriebstechnologie | ||||||
Location: | Göttingen | ||||||
Institutes and Institutions: | Institute for Aerodynamics and Flow Technology > Spacecraft, GO | ||||||
Deposited By: | Grabe, Martin | ||||||
Deposited On: | 12 Dec 2019 13:19 | ||||||
Last Modified: | 12 Dec 2019 13:19 |
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