Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Numerical Investigation of Supersonic Turbulent Flow Over Open Cavities   The study of cavity flow is one of the most important research topics of
unsteady aerodynamics. Supersonic turbulent flows over a cavity are mostly
encountered in missiles, turbomachinery, and high-speed aircraft. The
turbulence inside the cavity gives rise to excess drag, acoustic waves,
pressure fluctuations, and vibrations which may lead to numerous problems like
excess fuel consumption, failure of missile trajectory or mechanical parts, and
aerodynamic heating. We conduct numerical simulations to investigate the flow
and compare our results to existing experimental data to show quantitative
validation. We then investigate the effect of the Mach number of the turbulent
supersonic flow on the pressure contours and the vortical structures inside the
cavity and the subsequent effect on other flow parameters like acoustic waves.
Thereafter, we propose two modifications of the cavity geometry, a) slanted
edges and b) smoothened corners with slanted edges, to improve the aerodynamic
performance. ANSYS ICEM tool has been used for the fine mesh generation of our
cavity geometry and all the simulation was run on ANSYS fluent software. The K
omega SST turbulence model was used for the simulation as it can capture the
near wall property with reasonable accuracy and a grid independence study was
carried out to find the correct solution of the Navier Stokes equation was
proceeding by the solver. The parameters like pressure contours, streamline
pattern, coefficient of pressure distribution and sound pressure level (SPL)
has been found and compared for both modified and unmodified open cavity at
different Mach number. The modifications suggested show a significant
improvement over the open cavity designs in the mean pressure distribution and
sound pressure level distributions.

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The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ex
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The categories of this paper are: math
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ph
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The categories of this paper are: q-bio