It is shown how well-chosen perforations in a wall flow can locally reduce skin friction drag by modifying the generation of bursts in the boundary layer. For this purpose, a detailed hot wire boundary layer experimental investigation of the flow past a perforated plate, complemented with large eddy simulations, is carried out and compared to the smooth case. The perforated plate is obtained with an array of flush-mounted circular cavities. These cavities are disposed in a periodic staggered arrangement. For the three tested flow velocities, the momentum thickness-based Reynolds number varies from to 3380 and the cavity diameter and spacing in wall units, respectively, from to 250 and to 1075, the latter being identical in both spanwise and streamwise directions. The mean velocity profiles evidence a thickening of the viscous sublayer and a decrease in the friction velocity as compared to the smooth wall case. The application of the Variable Interval Time Averaging technique highlights an upward shift of the bursts from the wall and an attenuation of the average burst intensity and duration. Spanwise measurements evidence an overall bursts attenuation despite the lack of spanwise uniformity. The three-dimensional (3D) mean flow topology arising from the large eddy simulations provides evidence for the qualitative similarities between the current setup and the spanwise wall oscillations.
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June 2022
Research Article|
June 16 2022
Modification of a turbulent boundary layer by circular cavities
Francesco Scarano
;
Francesco Scarano
a)
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Visualization, Writing – original draft)
1
Département Aérodynamique et Propulsion (DAEP) ISAE-SUPAERO, Université de Toulouse
, 10, Avenue Edouard Belin 31400, Toulouse, France
a)Author to whom correspondence should be addressed: [email protected]
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Marc C. Jacob
;
Marc C. Jacob
(Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Supervision, Validation, Visualization, Writing – review & editing)
2
Laboratoire de Mécanique des Fluides et d'Acoustique, Ecole Centrale de Lyon
, France
; Institut National des Sciences Appliquées Lyon
, France
; and Université Claude Bernard Lyon I, Centre National de Recherche Scientifique, Université de Lyon
, 36 av. Guy de Collongue F-69134 Ecully, France
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Romain Gojon
;
Romain Gojon
(Software)
1
Département Aérodynamique et Propulsion (DAEP) ISAE-SUPAERO, Université de Toulouse
, 10, Avenue Edouard Belin 31400, Toulouse, France
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Xavier Carbonneau
;
Xavier Carbonneau
(Supervision)
1
Département Aérodynamique et Propulsion (DAEP) ISAE-SUPAERO, Université de Toulouse
, 10, Avenue Edouard Belin 31400, Toulouse, France
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Erwin R. Gowree
Erwin R. Gowree
(Conceptualization, Formal analysis, Funding acquisition, Investigation, Project administration, Resources, Supervision, Validation, Visualization, Writing – review & editing)
1
Département Aérodynamique et Propulsion (DAEP) ISAE-SUPAERO, Université de Toulouse
, 10, Avenue Edouard Belin 31400, Toulouse, France
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Francesco Scarano
1,a)
Marc C. Jacob
2
Romain Gojon
1
Xavier Carbonneau
1
Erwin R. Gowree
1
1
Département Aérodynamique et Propulsion (DAEP) ISAE-SUPAERO, Université de Toulouse
, 10, Avenue Edouard Belin 31400, Toulouse, France
2
Laboratoire de Mécanique des Fluides et d'Acoustique, Ecole Centrale de Lyon
, France
; Institut National des Sciences Appliquées Lyon
, France
; and Université Claude Bernard Lyon I, Centre National de Recherche Scientifique, Université de Lyon
, 36 av. Guy de Collongue F-69134 Ecully, France
a)Author to whom correspondence should be addressed: [email protected]
Physics of Fluids 34, 065134 (2022)
Article history
Received:
March 11 2022
Accepted:
May 26 2022
Citation
Francesco Scarano, Marc C. Jacob, Romain Gojon, Xavier Carbonneau, Erwin R. Gowree; Modification of a turbulent boundary layer by circular cavities. Physics of Fluids 1 June 2022; 34 (6): 065134. https://doi.org/10.1063/5.0091110
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