Control of the separated flow around an airfoil using a wavy leading edge inspired by humpback whale flippers
International audience The influence of spanwise geometrical undulations of the leading edge of an infinite wing is investigated numerically at low Reynolds number, in the context of passive separation control and focusing on the physical mechanisms involved. Inspired by the tubercles of the humpbac...
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Online Access: | https://hal.archives-ouvertes.fr/hal-00941404 https://hal.archives-ouvertes.fr/hal-00941404/document https://hal.archives-ouvertes.fr/hal-00941404/file/CRAS-whale.pdf https://doi.org/10.1016/j.crme.2011.11.004 |
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ftccsdartic:oai:HAL:hal-00941404v1 2023-05-15T16:35:53+02:00 Control of the separated flow around an airfoil using a wavy leading edge inspired by humpback whale flippers Favier, Julien Pinelli, Alfredo Piomelli, Ugo Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2) Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU) Unidad de Modelización y Simulación Numérica (CIEMAT) Unidad de Modelización y Simulación Numérica Dept. of Mechanical and Materials Engineering Queen's University Kingston, Canada 2012 https://hal.archives-ouvertes.fr/hal-00941404 https://hal.archives-ouvertes.fr/hal-00941404/document https://hal.archives-ouvertes.fr/hal-00941404/file/CRAS-whale.pdf https://doi.org/10.1016/j.crme.2011.11.004 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.crme.2011.11.004 hal-00941404 https://hal.archives-ouvertes.fr/hal-00941404 https://hal.archives-ouvertes.fr/hal-00941404/document https://hal.archives-ouvertes.fr/hal-00941404/file/CRAS-whale.pdf doi:10.1016/j.crme.2011.11.004 info:eu-repo/semantics/OpenAccess Comptes Rendus Mécanique https://hal.archives-ouvertes.fr/hal-00941404 Comptes Rendus Mécanique, Elsevier, 2012, 340 (1-2), pp.107-114. ⟨10.1016/j.crme.2011.11.004⟩ Flow control Biomimetics Immersed boundary Humpback whale flippers [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] info:eu-repo/semantics/article Journal articles 2012 ftccsdartic https://doi.org/10.1016/j.crme.2011.11.004 2021-11-28T01:20:53Z International audience The influence of spanwise geometrical undulations of the leading edge of an infinite wing is investigated numerically at low Reynolds number, in the context of passive separation control and focusing on the physical mechanisms involved. Inspired by the tubercles of the humpback whale flippers, the wavy leading edge is modeled using a spanwise sinusoidal function whose amplitude and wavelength constitute the parameters of control. A direct numerical simulation is performed on a NACA0020 wing profile in a deep stall configuration (α=20°α=20°), with and without the presence of the leading edge waviness. The complex solid boundaries obtained by varying the sinusoidal shape of the leading edge are modeled using an immersed boundary method (IBM) recently developed by the authors [Pinelli et al., J. Comput. Phys. 229 (2010) 9073-9091]. A particular set of wave parameters is found to change drastically the topology of the separated zone, which becomes dominated by streamwise vortices generated from the sides of the leading edge bumps. A physical analysis is carried out to explain the mechanism leading to the generation of these coherent vortical structures. The role they play in the control of boundary layer separation is also investigated, in the context of the modifications of the hydrodynamic performances which have been put forward in the literature in the last decade. Article in Journal/Newspaper Humpback Whale Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Comptes Rendus Mécanique 340 1-2 107 114 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Flow control Biomimetics Immersed boundary Humpback whale flippers [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] |
spellingShingle |
Flow control Biomimetics Immersed boundary Humpback whale flippers [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] Favier, Julien Pinelli, Alfredo Piomelli, Ugo Control of the separated flow around an airfoil using a wavy leading edge inspired by humpback whale flippers |
topic_facet |
Flow control Biomimetics Immersed boundary Humpback whale flippers [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] |
description |
International audience The influence of spanwise geometrical undulations of the leading edge of an infinite wing is investigated numerically at low Reynolds number, in the context of passive separation control and focusing on the physical mechanisms involved. Inspired by the tubercles of the humpback whale flippers, the wavy leading edge is modeled using a spanwise sinusoidal function whose amplitude and wavelength constitute the parameters of control. A direct numerical simulation is performed on a NACA0020 wing profile in a deep stall configuration (α=20°α=20°), with and without the presence of the leading edge waviness. The complex solid boundaries obtained by varying the sinusoidal shape of the leading edge are modeled using an immersed boundary method (IBM) recently developed by the authors [Pinelli et al., J. Comput. Phys. 229 (2010) 9073-9091]. A particular set of wave parameters is found to change drastically the topology of the separated zone, which becomes dominated by streamwise vortices generated from the sides of the leading edge bumps. A physical analysis is carried out to explain the mechanism leading to the generation of these coherent vortical structures. The role they play in the control of boundary layer separation is also investigated, in the context of the modifications of the hydrodynamic performances which have been put forward in the literature in the last decade. |
author2 |
Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2) Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU) Unidad de Modelización y Simulación Numérica (CIEMAT) Unidad de Modelización y Simulación Numérica Dept. of Mechanical and Materials Engineering Queen's University Kingston, Canada |
format |
Article in Journal/Newspaper |
author |
Favier, Julien Pinelli, Alfredo Piomelli, Ugo |
author_facet |
Favier, Julien Pinelli, Alfredo Piomelli, Ugo |
author_sort |
Favier, Julien |
title |
Control of the separated flow around an airfoil using a wavy leading edge inspired by humpback whale flippers |
title_short |
Control of the separated flow around an airfoil using a wavy leading edge inspired by humpback whale flippers |
title_full |
Control of the separated flow around an airfoil using a wavy leading edge inspired by humpback whale flippers |
title_fullStr |
Control of the separated flow around an airfoil using a wavy leading edge inspired by humpback whale flippers |
title_full_unstemmed |
Control of the separated flow around an airfoil using a wavy leading edge inspired by humpback whale flippers |
title_sort |
control of the separated flow around an airfoil using a wavy leading edge inspired by humpback whale flippers |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.archives-ouvertes.fr/hal-00941404 https://hal.archives-ouvertes.fr/hal-00941404/document https://hal.archives-ouvertes.fr/hal-00941404/file/CRAS-whale.pdf https://doi.org/10.1016/j.crme.2011.11.004 |
genre |
Humpback Whale |
genre_facet |
Humpback Whale |
op_source |
Comptes Rendus Mécanique https://hal.archives-ouvertes.fr/hal-00941404 Comptes Rendus Mécanique, Elsevier, 2012, 340 (1-2), pp.107-114. ⟨10.1016/j.crme.2011.11.004⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.crme.2011.11.004 hal-00941404 https://hal.archives-ouvertes.fr/hal-00941404 https://hal.archives-ouvertes.fr/hal-00941404/document https://hal.archives-ouvertes.fr/hal-00941404/file/CRAS-whale.pdf doi:10.1016/j.crme.2011.11.004 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.crme.2011.11.004 |
container_title |
Comptes Rendus Mécanique |
container_volume |
340 |
container_issue |
1-2 |
container_start_page |
107 |
op_container_end_page |
114 |
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