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Wall shear stress characterization of a 3D bluff-body separated flow

Wall shear stress characterization of a 3D bluff-body separated flow
Wall shear stress characterization of a 3D bluff-body separated flow
Efficient flow control strategies aimed at reducing the aerodynamic drag of road vehicles require a detailed knowledge of the reference flow. In this work, the flow around the rear slanted window of a generic car model was experimentally studied through wall shear stress measurements using an electrochemical method. The mean and fluctuating wall shear stress within the wall impact regions of the recirculation bubble and the main longitudinal vortex structures which develop above the rear window are presented. Correlations allow a more detailed characterization of the recirculation phenomenon within the separation bubble. In the model symmetry plane the recirculation structure compares well with simpler 2D configurations; specific lengths, flapping motion and shedding of large-scale vortices are observed, these similarities diminish when leaving the middle plane due to the strong three-dimensionality of the flow. A specific attention is paid to the convection processes occurring within the recirculation: a downstream convection velocity is observed, in accordance with 2D recirculations from the literature, and an upstream convection is highlighted along the entire bubble length which has not been underlined in some previous canonical configurations.
3D separated flow, recirculation bubble, instabilities, unsteady wall shear stress, electrochemical method
0889-9746
Fourrie, Gregoire
b79ce500-fc9f-4f8f-91ee-5cdeeb0f1907
Keirsbulck, Laurent
23ffecba-c4da-4741-9b51-4bcc6098e637
Labraga, Larbi
4f523e9d-1045-432f-a971-769dea06b3bd
Fourrie, Gregoire
b79ce500-fc9f-4f8f-91ee-5cdeeb0f1907
Keirsbulck, Laurent
23ffecba-c4da-4741-9b51-4bcc6098e637
Labraga, Larbi
4f523e9d-1045-432f-a971-769dea06b3bd

Fourrie, Gregoire, Keirsbulck, Laurent and Labraga, Larbi (2013) Wall shear stress characterization of a 3D bluff-body separated flow. Journal of Fluids and Structures. (doi:10.1016/j.jfluidstructs.2013.05.014).

Record type: Article

Abstract

Efficient flow control strategies aimed at reducing the aerodynamic drag of road vehicles require a detailed knowledge of the reference flow. In this work, the flow around the rear slanted window of a generic car model was experimentally studied through wall shear stress measurements using an electrochemical method. The mean and fluctuating wall shear stress within the wall impact regions of the recirculation bubble and the main longitudinal vortex structures which develop above the rear window are presented. Correlations allow a more detailed characterization of the recirculation phenomenon within the separation bubble. In the model symmetry plane the recirculation structure compares well with simpler 2D configurations; specific lengths, flapping motion and shedding of large-scale vortices are observed, these similarities diminish when leaving the middle plane due to the strong three-dimensionality of the flow. A specific attention is paid to the convection processes occurring within the recirculation: a downstream convection velocity is observed, in accordance with 2D recirculations from the literature, and an upstream convection is highlighted along the entire bubble length which has not been underlined in some previous canonical configurations.

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More information

e-pub ahead of print date: June 2013
Keywords: 3D separated flow, recirculation bubble, instabilities, unsteady wall shear stress, electrochemical method
Organisations: Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 355053
URI: http://eprints.soton.ac.uk/id/eprint/355053
ISSN: 0889-9746
PURE UUID: 9b3720de-0b68-42eb-8ad6-803979bd8953

Catalogue record

Date deposited: 12 Aug 2013 14:03
Last modified: 09 Nov 2021 00:12

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Contributors

Author: Gregoire Fourrie
Author: Laurent Keirsbulck
Author: Larbi Labraga

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