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Cubic Fokker-Planck-DSMC hybrid method for diatomic rarefied gas flow through a slit and an orifice

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

Full text not available from this repository.

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/
Document Type:Article
Title:Cubic Fokker-Planck-DSMC hybrid method for diatomic rarefied gas flow through a slit and an orifice
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jun, Eunjieunji.jun (at) dlr.deUNSPECIFIED
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:
EditorsEmail
UNSPECIFIEDElsevier
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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