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- W2328911895 abstract "This work explores self-sustained pitching oscillations of a NACA0012 airfoil operating at low-to-moderate Reynolds numbers in which the aerodynamic flow is in a transitional regime. One-degree of freedom (DOF) pitching oscillations were explored over a range of Reynolds numbers (7.7 × 10 < Rec ≤ 2.0 × 10). Laminar separation flutter grows naturally at the lowest Reynolds numbers. At Rec = 1.5 × 10, which falls above the previously identified flutter regime, sustained oscillations emerged following a disturbance applied to the structural model. This finding extends the applicable range of flow speeds beyond those previously reported and identifies a bifurcation of solution states at the extended Reynolds numbers. In all cases, negative aerodynamic damping is largely provided by suction beneath a separation bubble located behind the elastic axis. This feature induces a moment conducive to the pitching motion. Open trailing edge separation on the opposite surface transitions and reattaches immediately preceding the maximum angles of incidence. This event imparts a spike in the moment opposed to the pitching direction briefly damping oscillations. Earlier transition and reattachment of the trailing edge separation for the Rec = 1.5 × 10 case signals an earlier entrance to the negative work regime compared to the Rec = 1.1 × 10 case and resulting in a decreased LCO amplitude." @default.
- W2328911895 created "2016-06-24" @default.
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- W2328911895 date "2016-01-02" @default.
- W2328911895 modified "2023-09-26" @default.
- W2328911895 title "High-Fidelity LES Simulations of Self-Sustained Pitching Oscillations on a NACA0012 Airfoil at Transitional Reynolds Numbers" @default.
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- W2328911895 doi "https://doi.org/10.2514/6.2016-1353" @default.
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