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Modeling of Chemical Reactions in Rarefied Gas Flows by the Kinetic Fokker-Planck Method

Basov, Leo and Oblapenko, Georgii and Grabe, Martin (2023) Modeling of Chemical Reactions in Rarefied Gas Flows by the Kinetic Fokker-Planck Method. In: DSMC 2023 Conference. DSMC 2023 Conference, 2023-09-24 - 2023-09-27, Santa Fe, New Mexico, USA.

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Official URL: https://www.sandia.gov/dsmc/

Abstract

Flows encountered in space applications, like atmospheric reentry or thruster plume expansion and interactions, can be described by the well-known Boltzmann equation. A common approach to numerically solve it is the Direct Simulation Monte-Carlo (DSMC) [1]. The method is very efficient for high Knudsen numbers but becomes increasingly computationally intensive when approaching the continuum limit. In this regime the Boltzmann equation can be numerically solved using the kinetic Fokker-Planck method [2] which, like DSMC, relies on simulated particles to transport mass, momentum and energy through the flow domain, but does not resolve individual collisions. While this approach has been extended to mixtures [3, 4] and diatomic [5, 6] as well as polyatomic gases [7, 8], the modeling of chemical reactions remains a open research topic. Many problems arise from the fact that properties of the reactants need to be considered to evaluate a chemical reaction. This contradicts the Fokker-Planck approach that achieves its linear scaling in terms of particle numbers by forgoing the creation of interaction pairs. We propose a novel approach to model chemical reactions in the Fokker-Planck framework which aims to conserve mass, energy and momentum while retaining the performance advantages in areas of high density [9]. In this presentation we show an extension of the model for recombination and exchange reactions as well as verification results obtained from code-to-code comparisons.

Item URL in elib:https://elib.dlr.de/194565/
Document Type:Conference or Workshop Item (Speech)
Title:Modeling of Chemical Reactions in Rarefied Gas Flows by the Kinetic Fokker-Planck Method
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Basov, LeoUNSPECIFIEDhttps://orcid.org/0000-0003-4133-7876UNSPECIFIED
Oblapenko, GeorgiiUNSPECIFIEDhttps://orcid.org/0000-0002-1434-7166UNSPECIFIED
Grabe, MartinUNSPECIFIEDhttps://orcid.org/0000-0003-0361-2734UNSPECIFIED
Date:September 2023
Journal or Publication Title:DSMC 2023 Conference
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
UNSPECIFIEDSandia National LaboratoriesUNSPECIFIEDUNSPECIFIED
Status:Published
Keywords:DSMC, Fokker-Planck, rarefied gas, chemistry
Event Title:DSMC 2023 Conference
Event Location:Santa Fe, New Mexico, USA
Event Type:international Conference
Event Start Date:24 September 2023
Event End Date:27 September 2023
Organizer:Sandia National Laboratories
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: Basov, Leo
Deposited On:16 Nov 2023 12:08
Last Modified:24 Apr 2024 20:55

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