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Laminar separation flutter of a NACA0012 airfoil as a global instability

Abstract : The onset of pitch-oscillations of a NACA0012 airfoil mounted on a torsion-spring is investigated by the means of a global stability analysis. Experimental studies from literature have shown this configuration undergoing on a flutter behaviour for a close range of Reynolds. This phenomenon is attributed to the laminar character of the boundary layer and to its detachment, transition and subsequent reattachment on the airfoil surface. In this regard, we carried out a linear stability analysis of the mean flow field, issued from a RANS simulation, using a Spalart-Allmaras model. A careful choice of the inlet conditions revealed to be necessary to capture a laminar separation and, as the incidence increases, a laminar separation bubble (LSB).
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https://hal.archives-ouvertes.fr/hal-03368526
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Submitted on : Wednesday, October 6, 2021 - 6:20:51 PM
Last modification on : Wednesday, October 20, 2021 - 1:43:03 AM

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Diogo Sabino, Olivier Marquet, Vincent Mons, David Fabre. Laminar separation flutter of a NACA0012 airfoil as a global instability. ICTAM 2021, Aug 2021, Milan (Virtuel), Italy. ⟨hal-03368526⟩

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