@Article{LeiteSant:2015:CoAnFl,
author = "Leite, Paulo Henrique Mineiro and Santos, Wilson Fernando Nogueira
dos",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "Computational analysis of the flow field structure of a
non-reacting hypersonic flow over forward-facing steps",
journal = "Journal of Fluid Mechanics",
year = "2015",
volume = "763",
pages = "460--499",
month = "Jan.",
keywords = "boundary layer separation, high-speed flow, molecular dynamics.",
abstract = "This work is a computational study of a rarefied non-reacting
hypersonic flow past a forward-facing step at zero-degree angle of
attack in thermal non-equilibrium. Effects on the flow field
structure and on the aerodynamic surface quantities due to changes
in step frontal-face height are investigated by employing the
direct simulation Monte Carlo method. The work focuses the
attention of designers of hypersonic configurations on the
fundamental parameter of surface discontinuity, which can have an
important impact on even initial design. The results presented
highlight the sensitivity of the primary flow field properties,
velocity, density, pressure and temperature, to changes in the
step frontal-face height. In addition, the behaviour of heat
transfer, pressure and skin friction coefficients with variation
of the step frontal-face height is detailed. The analysis shows
that hypersonic flow past a forward-facing step in the transition
flow regime is characterized by a strong compression ahead of the
frontal face, which influences the aerodynamic surface properties
upstream and adjacent to the frontal face. The analysis also shows
that the extension of the upstream disturbance depends on the step
frontal-face height. It was found that the recirculation region
ahead of the step is also a function of the frontal-face height. A
sequence of Moffatt eddies of decreasing size and intensity is
observed in the concave step corner. Locally high heating and
pressure loads were observed at three locations along the surface,
i.e. on the lower surface, on the frontal face and on the upper
surface. The results showed that both loads rely on the
frontal-face height. The peak values for the heat transfer
coefficient on the frontal-face surface were at least one order of
magnitude larger than the maximum value observed for a smooth
surface, i.e. a flat plate without a step. A comparison of the
present simulation results with numerical and experimental data
showed close agreement concerning the wall pressure acting on the
step surface.",
doi = "10.1017/jfm.2014.677",
url = "http://dx.doi.org/10.1017/jfm.2014.677",
issn = "0022-1120",
language = "en",
targetfile = "leite_computational.pdf",
urlaccessdate = "27 abr. 2024"
}