Chemically reacting hypersonic flows over 3D cavities: flowfield structure characterisation

Palharini, R. C., Scanlon, T. J. and White, C. (2018) Chemically reacting hypersonic flows over 3D cavities: flowfield structure characterisation. Computers and Fluids, 165, pp. 173-187. (doi:10.1016/j.compfluid.2018.01.029)

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Abstract

In this paper, a computational investigation of hypersonic rarefied gas flows in the transitional flow regime over 3D cavities is carried out by using the direct simulation Monte Carlo method. Such cavities give rise to geometric discontinuities that are often present at the surface of reentry vehicles. This work is focused on the flowfield structure characterisation under a rarefied environment and in the presence of chemical reactions. The cavities are investigated with different length-to-depth ratios, and the different flow structures are studied. In particular, for length-to-depth ratios of 1 and 2, a single recirculation is observed inside the cavities and the main flow is not able to enter the cavity due to the recirculation structure and high particle density. In the case of length-to-depth ratio 3, the flow is able to partially enter the cavity resulting in an elongated recirculation and the beginning of a secondary recirculation core is noticed. For the case of values 4 and 5, the main flow is able to penetrate deeper into the cavities and two recirculation zones are observed; however, for the length-to-depth ratio 5 the flow impinges directly on the bottom surface, which is a behaviour that is only observed in the continuum regime with a cavity length-to-depth ratio greater than 14.

Item Type:Articles
Additional Information:The authors gratefully acknowledge the partial support for this research provided by Conselho Nacional de Desenvolvimento Cient´ıfico e Tecnol´ogico, CNPq, under the Research Grant No.200473/2010-7. The authors are also indebted to 465 the partial financial support received from Fundac¸a˜o de Amparo `a Pesquisa do Estado de S˜ao Paulo, FAPESP, under the Research Grant No. 2014/25438-1.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:White, Dr Craig and Palharini, Dr Rodrigo
Authors: Palharini, R. C., Scanlon, T. J., and White, C.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:Computers and Fluids
Publisher:Elsevier
ISSN:0045-7930
ISSN (Online):1879-0747
Published Online:31 January 2018
Copyright Holders:Copyright © 2018 Elsevier
First Published:First published in Computers and Fluids 165:173-187
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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