Title: Large-scale flow structures in turbulence mixing of sonic jet injection into supersonic crossflow

Authors: El-Hadi Khali; Yufeng Yao

Addresses: Institute of Aeronautics and Space Studies, University of Blida 1, Blida 09000, Algeria ' Department of Engineering Design and Mathematics, University of the West of England, Bristol BS16 1QY, UK

Abstract: A hybrid Reynolds-averaged Navier-Stokes (RANS) and large-eddy simulation (LES) fluid dynamics simulation has been performed to explore physical insights of flow mixing characteristics, resulted from an interaction between a sonic jet issuing perpendicularly into a supersonic crossflow. This numerical approach allows for the simulations to resolve unsteady large-scale flow structures, and as well as to capture the mean flow accurately, both parameters play important roles in this kind of flow mixing process. After validating time-averaged 'mean' results against available experimental measurements, further comparison of instantaneous unsteady flow field is made to reveal dynamic process occurred in the mixing flow computation. Some key flow characteristics observed in the experiments are successfully reproduced by present numerical study, namely boundary layer flow separation at the jet exit and shear-layer vortex development along the interface between the jet stream and the crossflow, the latter is mainly due to the Kelvin-Helmholtz instability.

Keywords: coherent structures; sonic jet in supersonic crossflow; counter rotating vortex pair; CRVP; improved-delayed detached-eddy simulation; IDDES; bounded central differencing scheme; implicit time integration.

DOI: 10.1504/IJTAMM.2018.096429

International Journal of Theoretical and Applied Multiscale Mechanics, 2018 Vol.3 No.2, pp.145 - 160

Received: 03 Jan 2018
Accepted: 16 Apr 2018
Published online: 28 Nov 2018 *

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