Shock-wave/boundary-layer interactions in transitional rectangular duct flows
Shock-wave/boundary-layer interactions in transitional rectangular duct flows
Shock-wave/boundary-layer interactions (SBLI) are an important feature of high-speed gas dynamics. In many numerical studies of SBLI span-periodicity is assumed to reduce computational complexity. However, span-periodicity is not a valid assumption for aeronautical applications such as supersonic engine intakes where lateral confinement leads to highly three-dimensional behaviour. In this work transitional oblique SBLI are simulated for a rectangular duct with θsg = 5º shock generator ramp at Mach 2. The baseline configuration is a duct with an aspect ratio of 0.5. Time-dependent disturbances are added to the base laminar flow via wall localised blowing/suction strips to obtain intermittent transition upstream of the SBLI. Two forcing configurations are evaluated to assess the response of the SBLI to different tripping locations. The transition is observed to develop first in the low-momentum corners of the duct and spread out in a wedge shape. The central separation bubble is seen to react dynamically to oncoming turbulent spots, shifting laterally across the span. While instantaneous corner separations do occur, the time-averaged corner flow remains attached. Comparisons to a one-to-one aspect ratio duct show that the SBLI is heavily dependent on aspect ratio; the wider duct exhibited significantly larger regions of flow-reversal due to a strengthened interaction.
SBLI, flow-confinement, flow-separation, transition
649-670
Lusher, David
44ff9096-3c84-440a-9f64-946636aff985
Sandham, Neil
0024d8cd-c788-4811-a470-57934fbdcf97
1 August 2020
Lusher, David
44ff9096-3c84-440a-9f64-946636aff985
Sandham, Neil
0024d8cd-c788-4811-a470-57934fbdcf97
Lusher, David and Sandham, Neil
(2020)
Shock-wave/boundary-layer interactions in transitional rectangular duct flows.
Flow Turbulence and Combustion, 105 (2), .
(doi:10.1007/s10494-020-00134-0).
Abstract
Shock-wave/boundary-layer interactions (SBLI) are an important feature of high-speed gas dynamics. In many numerical studies of SBLI span-periodicity is assumed to reduce computational complexity. However, span-periodicity is not a valid assumption for aeronautical applications such as supersonic engine intakes where lateral confinement leads to highly three-dimensional behaviour. In this work transitional oblique SBLI are simulated for a rectangular duct with θsg = 5º shock generator ramp at Mach 2. The baseline configuration is a duct with an aspect ratio of 0.5. Time-dependent disturbances are added to the base laminar flow via wall localised blowing/suction strips to obtain intermittent transition upstream of the SBLI. Two forcing configurations are evaluated to assess the response of the SBLI to different tripping locations. The transition is observed to develop first in the low-momentum corners of the duct and spread out in a wedge shape. The central separation bubble is seen to react dynamically to oncoming turbulent spots, shifting laterally across the span. While instantaneous corner separations do occur, the time-averaged corner flow remains attached. Comparisons to a one-to-one aspect ratio duct show that the SBLI is heavily dependent on aspect ratio; the wider duct exhibited significantly larger regions of flow-reversal due to a strengthened interaction.
Text
Lusher_APPL-D-19-00261R1
- Accepted Manuscript
More information
Accepted/In Press date: 31 March 2020
e-pub ahead of print date: 23 April 2020
Published date: 1 August 2020
Additional Information:
Funding Information:
David J. Lusher is funded by an EPSRC Centre for Doctoral Training Grant (EP/L015382/1).
Funding Information:
Compute resources used in this work were provided by the ‘Cambridge Service for Data Driven Discovery’ (CSD3) system operated by the University of Cambridge Research Computing Service ( http://www.hpc.cam.ac.uk ) funded by EPSRC Tier-2 capital grant EP/P020259/1, and the IRIDIS5 High Performance Computing Facility, and associated support services at the University of Southampton. The OpenSBLI code is available at https://opensbli.github.io . Data from this report will be available from the University of Southampton institutional repository.
Publisher Copyright:
© 2020, The Author(s).
Keywords:
SBLI, flow-confinement, flow-separation, transition
Identifiers
Local EPrints ID: 439135
URI: http://eprints.soton.ac.uk/id/eprint/439135
ISSN: 1386-6184
PURE UUID: b0d27546-4d58-49a2-88a2-184b82eed526
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Date deposited: 06 Apr 2020 16:30
Last modified: 17 Mar 2024 05:27
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Author:
David Lusher
Author:
Neil Sandham
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