Detailed comparison of diffusive transport phenomena between CFD and DSMC on a two-dimensional cylinder

Chiara Amato, Michael Kroells, Thomas E. Schwartzentruber, Graham V. Candler

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The present paper aims to analyze the effects of the diffusion transport properties and chemical kinetics on two-dimensional hypersonic flow in the near-continuum regime. We simulate a five species air mixture with different free stream conditions using both US3D, a code routinely used for complex hypersonic computational fluid dynamics (CFD) simulations, and MGDS, a code capable of large-scale 3D Direct simulation Monte Carlo (DSMC) calculations. We study the effect of the reactions through the comparison between the Park model, the Modified Marrone-Treanor chemical kinetics model, available in US3D, and the total collision energy model, available in MGDS. We observed intriguing discrepancies in the near-wall region. Therefore, we quantify the diffusive transport terms and identify the leading diffusive phenomena. Furthermore, we implemented the transport properties derived from the Chapman-Enskog method for a multi-component mixture and repeated the same test case. All the CFD simulations neglect the thermal diffusion term, which we have found are not negligible at these conditions.

Original languageEnglish (US)
Title of host publicationAIAA Scitech 2021 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Pages1-15
Number of pages15
ISBN (Print)9781624106095
DOIs
StatePublished - 2021
EventAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021 - Virtual, Online
Duration: Jan 11 2021Jan 15 2021

Publication series

NameAIAA Scitech 2021 Forum

Conference

ConferenceAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021
CityVirtual, Online
Period1/11/211/15/21

Bibliographical note

Funding Information:
This research was supported by the Air Force Office of Scientific Research (AFOSR) under grant numbers FA9550-17-1-0250 and FA9550-19-1-0219. The view and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the AFOSR or the US government.

Publisher Copyright:
© 2021, American Institute of Aeronautics and Astronautics Inc, AIAA. All Rights Reserved.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

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