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 en...

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Bibliographic Details
Published in:Flow, turbulence and combustion turbulence and combustion, 2020-08, Vol.105 (2), p.649-670
Main Authors: Lusher, David J., Sandham, Neil D.
Format: Article
Language:English
Subjects:
Aerodynamics
Aspect ratio
Automotive Engineering
Boundary layer interaction
Boundary layer transition
Computational fluid dynamics
Computer simulation
Configurations
Corner flow
Engine inlets
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Fluid- and Aerodynamics
Gas dynamics
Heat and Mass Transfer
Laminar flow
Periodic variations
Shock wave interaction
Shock waves
Suction
Time dependence
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Summary: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 a θ sg = 5 ∘ 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.
ISSN:1386-6184
1573-1987
DOI:10.1007/s10494-020-00134-0