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Cubic Fokker-Planck-DSMC hybrid method for diatomic gas flow through a slit

Jun, Eunji and Grabe, Martin and Hannemann, Klaus (2018) Cubic Fokker-Planck-DSMC hybrid method for diatomic gas flow through a slit. In: AIP Conference Proceedings, 2132 (070001). American Institute of Physics Inc.. 31st International Symposium on Rarefied Gas Dynamics 2018, 23.-27. Jul. 2018, Glasgow, Scotland. DOI: 10.1063/1.5119555 ISBN 978-073541874-5 ISSN 0094243X

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Official URL: http://www.jwfl.ac.uk/event_detail.cfm?pid=07C7020B-AC36-4F5B-BA23-1BE3EC1C67D9

Abstract

Rarefied gas flows through a thin slit have attracted great practical and scientific interest because they have many engineering applications, e.g. vacuum equipment, microfluidics, spacecraft design, metrology of gas flow etc. Extensive numerical investigations have been studied on pressure driven gas flow through a thin slit by applying DSMC. Recently proposed kinetic Fokker-Planck (FP) models approximate the inter-particle collisions by a stochastic process, which permits using a larger cell size and time step than would be required by DSMC in flow domains where the local Knudsen number is less than unity. Furthermore, a coupled FP-DSMC solution method has been developed aiming at an efficient and accurate solution algorithm for rarefied gas flows. In this research, pressure driven Argon gas flow through a thin slit will be investigated over the wide range of gas rarefaction covering the free-molecular, transitional and near continuum regime by applying DSMC, FP and FP-DSMC hybrid schemes. We consider a slit which separates two reservoirs. One of them contains a gas at a pressure P0 while the other is maintained at a smaller pressure P1. Four different pressure ratios (P1/P0 = 0, 0.1, 0.5, 0.9) and 6 different degree of rarefaction are considered. A detailed analysis and comparison of accuracy of standard DSMC and cubic FP solution is performed. Then, the near-continuum cases with various pressure ratios are simulated with FP-DSMC hybrid scheme. Accuracy and efficiency of FP-DSMC hybrid scheme are discussed in a detailed study.

Item URL in elib:https://elib.dlr.de/119791/
Document Type:Conference or Workshop Item (Speech)
Title:Cubic Fokker-Planck-DSMC hybrid method for diatomic gas flow through a slit
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jun, Eunjieunji.jun (at) dlr.deUNSPECIFIED
Grabe, Martinmartin.grabe (at) dlr.deUNSPECIFIED
Hannemann, KlausKlaus.Hannemann (at) dlr.dehttps://orcid.org/0000-0002-9653-4087
Date:5 August 2018
Journal or Publication Title:AIP Conference Proceedings
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:2132
DOI :10.1063/1.5119555
Editors:
EditorsEmail
Lockerby, D.UNSPECIFIED
Emerson, D.R.UNSPECIFIED
Wu, L.UNSPECIFIED
Zhang, Y.UNSPECIFIED
Publisher:American Institute of Physics Inc.
ISSN:0094243X
ISBN:978-073541874-5
Status:Published
Keywords:Direct Simulation Monte Carlo (DSMC), Fokker-Planck, Plume, Orifice
Event Title:31st International Symposium on Rarefied Gas Dynamics 2018
Event Location:Glasgow, Scotland
Event Type:international Conference
Event Dates:23.-27. Jul. 2018
Organizer:University of Strathclyde
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:26 Nov 2018 17:18
Last Modified:13 Nov 2019 16:45

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