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Investigation of rarefied flow over an open cavity using direct simulation Monte Carlo

Published online by Cambridge University Press:  14 November 2022

D. Nabapure Open the ORCID record for D. Nabapure [Opens in a new window] ,
A. Singh Open the ORCID record for A. Singh [Opens in a new window]  and
R.C.M. Kalluri
D. Nabapure*
Affiliation:
High-Performance Computing (HPC) Lab, Department of Mechanical Engineering, Birla Institute of Technology and Science-Pilani, Hyderabad, 500078, India
A. Singh
Affiliation:
High-Performance Computing (HPC) Lab, Department of Mechanical Engineering, Birla Institute of Technology and Science-Pilani, Hyderabad, 500078, India
R.C.M. Kalluri
Affiliation:
High-Performance Computing (HPC) Lab, Department of Mechanical Engineering, Birla Institute of Technology and Science-Pilani, Hyderabad, 500078, India
*
*Correspondence author. Email: p20150056@hyderabad.bits-pilani.ac.in
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Abstract

The present study employs the direct simulation Monte Carlo (DSMC) technique to analyse the flow over a cavity, a commonly observed anomaly on a re-entry vehicle’s surface. The flow characteristics are examined for different Mach numbers ( ${\rm{Ma}}$ ) and Knudsen number ( ${\rm{Kn}}$ ). The Mach numbers varied from 5 to 25, while the Knudsen numbers varied from 0.05 to 21.10. The influence of the ${\rm{Ma}}$ and ${\rm{Kn}}$ on flow characteristics has been elucidated graphically in various sections. The flow properties showed significant variation with ${\rm{Ma}}$ and ${\rm{Kn}}$ and showed an increasing trend due to compressibility and viscous heating effects. The surface characteristics were observed to diminish as ${\rm{Ma}}$ increases, while they showed complex trends for various ${\rm{Kn}}$ . In all flow regimes, there was an appearance of flow recirculation. When chemical reactions were taken into consideration and compared with non-reacting flows, flow temperature was primarily influenced (which decreased due to energy absorption) compared to other properties. The results obtained are a complex interplay of the viscous heating, compression and rarefaction effects.

Keywords

DSMCFlow regimeHypersonic flowOpen cavityRarefied gas flowsReentry vehicle
Type
Research Article
Information
The Aeronautical Journal , Volume 127 , Issue 1312 , June 2023 , pp. 1009 - 1036
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Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of Royal Aeronautical Society

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