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Stability of the Low Reynolds Number Compressible Flow Past a NACA0012 Airfoil

Rolandi, Laura Victoria and Jardin, Thierry and Fontane, Jérôme and Gressier, Jérémie and Joly, Laurent Stability of the Low Reynolds Number Compressible Flow Past a NACA0012 Airfoil. (2021) AIAA Journal. ISSN 0001-1452

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Official URL: https://doi.org/10.2514/1.J060792

Abstract

With stratospheric flight ormartian exploration in perspective, the compressibility influence on thewake dynamics of a NACA0012 profile is investigated. The unsteady flow past the airfoil at Re = 1000 is characterized using direct numerical simulations for various angles of attack α ∈ [0°; 20°] and Mach numbers up to M∞ = 0.5. Steady flows obtained using the selective frequency damping (SFD) technique are used as base states for a global linear stability analysis. The influence of both the angle of attack and the Reynolds number on the most amplifiedmode characteristics is first investigated in the incompressible regime. Then, the compressibility effects in the subcritical regime are considered. A stabilizing or a destabilizing effect of compressibility is observed depending on the angle of attack and theReynolds number. For α < 20°, compressibility has a destabilizing effect close to the critical threshold,which results in anearlierHopfbifurcation,whereas increasing theMach number always results in a decrease of the growth rate of the mode well above the critical threshold. Finally, the mode frequency decreases with the Mach number.

Item Type:Article
HAL Id:hal-03368039
Audience (journal):International peer-reviewed journal
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Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
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Deposited On:06 Oct 2021 13:18

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