The effect of flow confinement on laminar shock-wave/boundary-layer interactions
The effect of flow confinement on laminar shock-wave/boundary-layer interactions
Numerical work on shock-wave/boundary-layer interactions (SBLI) to date has largely focused on span-periodic quasi-two-dimensional (quasi-2-D) configurations that neglect the influence lateral confinement has on the core flow. The present study is concerned with the effect of flow confinement on Mach 2 laminar SBLI in rectangular ducts. An oblique shock generated by a wedge forms a conical swept SBLI with sidewall boundary layers before reflecting from the bottom wall of the domain. Multiple large regions of flow-reversal are observed on the sidewalls, bottom wall and at the corner intersection. The main interaction is found to be strongly three-dimensional and highly dependent on the geometry of the duct. Comparison to quasi-2-D span-periodic simulations showed sidewalls strengthen the interaction by 31 % for the baseline configuration with an aspect ratio of one. The length of the shock generator and subsequent trailing edge expansion fan position was shown to be a critical parameter in determining the central separation length. By shortening the length of the shock generator, modification of the interaction and suppression of the central interaction is demonstrated. Parametric studies of shock strength and duct aspect ratio were performed to find limiting behaviours. For the largest aspect ratio of four, three-dimensionality was visible across 30 % of the span width away from the wall. The topology of the three-dimensional separation is shown to be similar to 'owl-like' separations of the first kind. Reflection of the initial conical swept SBLI is found to be the most significant factor determining the flow structures downstream of the main interaction.
SBLI, flow confinement, three-dimensional separation
A18
Lusher, David
dd681c9e-ceae-409b-8153-8248c13a18e5
Sandham, Neil
0024d8cd-c788-4811-a470-57934fbdcf97
25 August 2020
Lusher, David
dd681c9e-ceae-409b-8153-8248c13a18e5
Sandham, Neil
0024d8cd-c788-4811-a470-57934fbdcf97
Lusher, David and Sandham, Neil
(2020)
The effect of flow confinement on laminar shock-wave/boundary-layer interactions.
Journal of Fluid Mechanics, 897, , [A18].
(doi:10.1017/jfm.2020.354).
Abstract
Numerical work on shock-wave/boundary-layer interactions (SBLI) to date has largely focused on span-periodic quasi-two-dimensional (quasi-2-D) configurations that neglect the influence lateral confinement has on the core flow. The present study is concerned with the effect of flow confinement on Mach 2 laminar SBLI in rectangular ducts. An oblique shock generated by a wedge forms a conical swept SBLI with sidewall boundary layers before reflecting from the bottom wall of the domain. Multiple large regions of flow-reversal are observed on the sidewalls, bottom wall and at the corner intersection. The main interaction is found to be strongly three-dimensional and highly dependent on the geometry of the duct. Comparison to quasi-2-D span-periodic simulations showed sidewalls strengthen the interaction by 31 % for the baseline configuration with an aspect ratio of one. The length of the shock generator and subsequent trailing edge expansion fan position was shown to be a critical parameter in determining the central separation length. By shortening the length of the shock generator, modification of the interaction and suppression of the central interaction is demonstrated. Parametric studies of shock strength and duct aspect ratio were performed to find limiting behaviours. For the largest aspect ratio of four, three-dimensionality was visible across 30 % of the span width away from the wall. The topology of the three-dimensional separation is shown to be similar to 'owl-like' separations of the first kind. Reflection of the initial conical swept SBLI is found to be the most significant factor determining the flow structures downstream of the main interaction.
Text
Lusher_JFM_2020
- Accepted Manuscript
More information
Accepted/In Press date: 21 April 2020
e-pub ahead of print date: 11 June 2020
Published date: 25 August 2020
Additional Information:
Publisher Copyright:
© The Author(s), 2020. Published by Cambridge University Press.
Keywords:
SBLI, flow confinement, three-dimensional separation
Identifiers
Local EPrints ID: 439727
URI: http://eprints.soton.ac.uk/id/eprint/439727
ISSN: 0022-1120
PURE UUID: 99d89738-5352-48c8-a2e9-d74fde5ca201
Catalogue record
Date deposited: 30 Apr 2020 16:34
Last modified: 17 Mar 2024 04:02
Export record
Altmetrics
Contributors
Author:
David Lusher
Author:
Neil Sandham
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics