Gust response of rigid and elastically mounted airfoils at a transitional Reynolds number

This article explores the evolution of the unsteady flow structure for rigid and elastically mounted NACA0012 airfoils subject to a parallel vortical gust disturbance at a Reynolds number of Re=150,000 using implicit large-eddy simulation coupled with a structural dynamics model. A Taylor vortex is...

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Published inAerospace science and technology Vol. 74; pp. 112 - 119
Main Authors Barnes, Caleb J., Visbal, Miguel R.
Format Journal Article
LanguageEnglish
Published Elsevier Masson SAS 01.03.2018
Subjects
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ISSN1270-9638
1626-3219
DOI10.1016/j.ast.2017.12.025

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Abstract This article explores the evolution of the unsteady flow structure for rigid and elastically mounted NACA0012 airfoils subject to a parallel vortical gust disturbance at a Reynolds number of Re=150,000 using implicit large-eddy simulation coupled with a structural dynamics model. A Taylor vortex is supplied upstream of the airfoil and shown to be successful at eliciting laminar separation flutter in the elastically mounted system under conditions which normally require an artificial disturbance. Much of the gust-induced moment responsible for flutter excitation is supplied by a two-stage flow transition process on the undersurface of the wing after the gust passes the airfoil. The gust response triggers transition of the separated lower-surface boundary layer into spanwise coherent vortices followed by a laminar separation bubble accompanied by a secondary emergence of flow transition. These events appear to be analogous in some ways to the processes that appear during fully developed flutter but occur over a shorter timescale.
AbstractList This article explores the evolution of the unsteady flow structure for rigid and elastically mounted NACA0012 airfoils subject to a parallel vortical gust disturbance at a Reynolds number of Re=150,000 using implicit large-eddy simulation coupled with a structural dynamics model. A Taylor vortex is supplied upstream of the airfoil and shown to be successful at eliciting laminar separation flutter in the elastically mounted system under conditions which normally require an artificial disturbance. Much of the gust-induced moment responsible for flutter excitation is supplied by a two-stage flow transition process on the undersurface of the wing after the gust passes the airfoil. The gust response triggers transition of the separated lower-surface boundary layer into spanwise coherent vortices followed by a laminar separation bubble accompanied by a secondary emergence of flow transition. These events appear to be analogous in some ways to the processes that appear during fully developed flutter but occur over a shorter timescale.
Author Visbal, Miguel R.
Barnes, Caleb J.
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Keywords Aeroelastic
Fluid–structure interaction
Flutter
Gust response
Transitional Reynolds number
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Snippet This article explores the evolution of the unsteady flow structure for rigid and elastically mounted NACA0012 airfoils subject to a parallel vortical gust...
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StartPage 112
SubjectTerms Aeroelastic
Fluid–structure interaction
Flutter
Gust response
Transitional Reynolds number
Title Gust response of rigid and elastically mounted airfoils at a transitional Reynolds number
URI https://dx.doi.org/10.1016/j.ast.2017.12.025
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