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A low-variance particle collision scheme for variable weight DSMC simulations

Oblapenko, Georgii (2023) A low-variance particle collision scheme for variable weight DSMC simulations. In: SIAM Conference on Computational Science and Engineering CSE23 2023. SIAM CSE 23 (SIAM Conference on Computational Science and Engineering), 2023-02-26 - 2023-03-03, Amsterdam, Netherlands.

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Official URL: https://www.siam.org/conferences/cm/conference/cse23


Numerical simulation of rarefied plasmas often makes use of Particle-in-Cell-Direct Simulation Monte Carlo (PIC-DSMC) codes [Birdsall, C. K., Particle-in-cell charged-particle simulations, plus Monte Carlo collisions with neutral atoms, PIC-MCC. Trans. Plasma Sci., 19(2), 1991], which simulate the motion of a large number of computational particles, each of which represents a large number of actual molecules, atoms, or electrons. Particle-particle and particle-surface collisions in such codes are performed in a stochastic manner: a single process is simulated for each collision, with the process being randomly chosen based on the probability of it taking place. In the present work a new collision and boundary condition simulation scheme, dubbed "event splitting" [Oblapenko, G. et al, Hedging direct simulation Monte Carlo bets via event splitting, J. Comput. Phys., 466, 2022], is investigated. It simulates multiple events simultaneously via splitting of the particles involved in the collision and has been shown to significantly reduce the level of stochastic noise in unsteady breakdown simulations. The scheme is applied to 1-D modelling of discharges in rarefied argon and helium plasmas, and compared to standard PIC-DSMC collision routines in terms of computational efficiency and numerical noise.

Item URL in elib:https://elib.dlr.de/196160/
Document Type:Conference or Workshop Item (Speech)
Title:A low-variance particle collision scheme for variable weight DSMC simulations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Oblapenko, GeorgiiUNSPECIFIEDhttps://orcid.org/0000-0002-1434-7166UNSPECIFIED
Date:2 March 2023
Journal or Publication Title:SIAM Conference on Computational Science and Engineering CSE23 2023
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
EditorsEmailEditor's ORCID iDORCID Put Code
Keywords:DSMC, event spliting
Event Title:SIAM CSE 23 (SIAM Conference on Computational Science and Engineering)
Event Location:Amsterdam, Netherlands
Event Type:international Conference
Event Start Date:26 February 2023
Event End Date:3 March 2023
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Reusable Space Systems and Propulsion Technology
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Deposited By: Hannemann, Dr.rer.nat. Volker
Deposited On:25 Aug 2023 14:16
Last Modified:24 Apr 2024 20:56

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