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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
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.
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- Research Article
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- Copyright
- © The Author(s), 2022. Published by Cambridge University Press on behalf of Royal Aeronautical Society
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