Large-eddy simulations of the flow on an aerofoil with leading-edge imperfections

We performed large-eddy simulations of the flow over an aerofoil to understand the effects of leading-edge roughness designed to mimic ice accretion. The roughness elements protrude outside the boundary layer, which, near the leading edge, is very thin; thus, the configuration does not represent a c...

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Authors: Kumar, Vishal, Piomelli, Ugo, Lehmkuhl Barba, Oriol|||0000-0002-2670-1871
Format: article
Publication Date:2021
Country:España
Institution:Universitat Politècnica de Catalunya (UPC)
Repository:UPCommons. Portal del coneixement obert de la UPC
Language:English
OAI Identifier:oai:upcommons.upc.edu:2117/351570
Online Access:https://hdl.handle.net/2117/351570
https://dx.doi.org/10.1080/14685248.2021.1973015
Access Level:Open access
Keyword:Computer simulation
Leading edges (Aerodynamics)
Ice accretion
Turbulence--Simulation methods
Large-eddy simulations
Aerofoil
Roughness
Icing
Simulació per ordinador
Àrees temàtiques de la UPC::Informàtica::Aplicacions de la informàtica::Aplicacions informàtiques a la física i l‘enginyeria
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spelling Large-eddy simulations of the flow on an aerofoil with leading-edge imperfectionsKumar, VishalPiomelli, UgoLehmkuhl Barba, Oriol|||0000-0002-2670-1871Computer simulationLeading edges (Aerodynamics)Ice accretionTurbulence--Simulation methodsLarge-eddy simulationsAerofoilRoughnessIcingSimulació per ordinadorÀrees temàtiques de la UPC::Informàtica::Aplicacions de la informàtica::Aplicacions informàtiques a la física i l‘enginyeriaWe performed large-eddy simulations of the flow over an aerofoil to understand the effects of leading-edge roughness designed to mimic ice accretion. The roughness elements protrude outside the boundary layer, which, near the leading edge, is very thin; thus, the configuration does not represent a classical rough-wall boundary layer, but rather the flow over macroscopic obstacles. A grid convergence study is conducted and results are validated by comparison to numerical and experimental studies in the literature. The main effect of the obstacles is to accelerate transition to turbulence. Significant variations in structure generation are observed for different roughness shapes. The three-dimensionality of the irregularities has a strong impact on the flow: it creates alternating regions of high-speed (‘peaks’) and low-speed (‘valleys’) regions, a phenomenon termed ‘channelling’. The valley regions resemble a decelerating boundary layer: they exhibit considerable wake and higher levels of Reynolds stresses. The peak regions, on the other hand, are more similar to an accelerating one. Implications of the channelling phenomenon on turbulence modelling are discussed.VK acknowledges the financial support by Mitacs, Bombardier Aerospace and CARIC/CRIAQ. UP acknowledges the support from the Natural Science and Engineering Research Council of Canada (NSERC) under the Discovery Grant program, and the Canada Research Chair program. This research was enabled in part by computational support provided by Compute Ontario (computeontario.ca) and Southern Ontario Smart Computing Innovation Platform (SOSCIP) (www.soscip.org).Peer ReviewedTaylor and Francis20212021-01-0120212021-09-17journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/351570https://dx.doi.org/10.1080/14685248.2021.1973015reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/3515702026-05-27T15:37:01Z
dc.title.none.fl_str_mv Large-eddy simulations of the flow on an aerofoil with leading-edge imperfections
title Large-eddy simulations of the flow on an aerofoil with leading-edge imperfections
spellingShingle Large-eddy simulations of the flow on an aerofoil with leading-edge imperfections
Kumar, Vishal
Computer simulation
Leading edges (Aerodynamics)
Ice accretion
Turbulence--Simulation methods
Large-eddy simulations
Aerofoil
Roughness
Icing
Simulació per ordinador
Àrees temàtiques de la UPC::Informàtica::Aplicacions de la informàtica::Aplicacions informàtiques a la física i l‘enginyeria
title_short Large-eddy simulations of the flow on an aerofoil with leading-edge imperfections
title_full Large-eddy simulations of the flow on an aerofoil with leading-edge imperfections
title_fullStr Large-eddy simulations of the flow on an aerofoil with leading-edge imperfections
title_full_unstemmed Large-eddy simulations of the flow on an aerofoil with leading-edge imperfections
title_sort Large-eddy simulations of the flow on an aerofoil with leading-edge imperfections
dc.creator.none.fl_str_mv Kumar, Vishal
Piomelli, Ugo
Lehmkuhl Barba, Oriol|||0000-0002-2670-1871
author Kumar, Vishal
author_facet Kumar, Vishal
Piomelli, Ugo
Lehmkuhl Barba, Oriol|||0000-0002-2670-1871
author_role author
author2 Piomelli, Ugo
Lehmkuhl Barba, Oriol|||0000-0002-2670-1871
author2_role author
author
dc.subject.none.fl_str_mv Computer simulation
Leading edges (Aerodynamics)
Ice accretion
Turbulence--Simulation methods
Large-eddy simulations
Aerofoil
Roughness
Icing
Simulació per ordinador
Àrees temàtiques de la UPC::Informàtica::Aplicacions de la informàtica::Aplicacions informàtiques a la física i l‘enginyeria
topic Computer simulation
Leading edges (Aerodynamics)
Ice accretion
Turbulence--Simulation methods
Large-eddy simulations
Aerofoil
Roughness
Icing
Simulació per ordinador
Àrees temàtiques de la UPC::Informàtica::Aplicacions de la informàtica::Aplicacions informàtiques a la física i l‘enginyeria
description We performed large-eddy simulations of the flow over an aerofoil to understand the effects of leading-edge roughness designed to mimic ice accretion. The roughness elements protrude outside the boundary layer, which, near the leading edge, is very thin; thus, the configuration does not represent a classical rough-wall boundary layer, but rather the flow over macroscopic obstacles. A grid convergence study is conducted and results are validated by comparison to numerical and experimental studies in the literature. The main effect of the obstacles is to accelerate transition to turbulence. Significant variations in structure generation are observed for different roughness shapes. The three-dimensionality of the irregularities has a strong impact on the flow: it creates alternating regions of high-speed (‘peaks’) and low-speed (‘valleys’) regions, a phenomenon termed ‘channelling’. The valley regions resemble a decelerating boundary layer: they exhibit considerable wake and higher levels of Reynolds stresses. The peak regions, on the other hand, are more similar to an accelerating one. Implications of the channelling phenomenon on turbulence modelling are discussed.
publishDate 2021
dc.date.none.fl_str_mv 2021
2021-01-01
2021
2021-09-17
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/351570
https://dx.doi.org/10.1080/14685248.2021.1973015
url https://hdl.handle.net/2117/351570
https://dx.doi.org/10.1080/14685248.2021.1973015
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Taylor and Francis
publisher.none.fl_str_mv Taylor and Francis
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869405510770360320
score 15.300719

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