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- W2319176894 abstract "Multiple solutions of the small-disturbance potential equation and the full potential equation were known for the NACA0012 airfoil in a certain range of transonic Mach numbers and at zero angle of attack. However the multiple solutions for this particular airfoil were not observed using Euler or Navier-Stokes equations under the above flow conditions. In the present work, both the Unsteady Reynolds-Averaged Navier-Stokes (URANS) computations and transonic wind tunnel experiments are performed to further study the problem. The results of the two methods reveal that buffet appears under certain Reynolds number and transition position in a narrow Mach number range where the potential flow methods predict multiple solutions. Boundary layer displacement thickness computed from URANS at the same flow condition is used to modify the geometry of the NACA0012 airfoil. Euler equations are then solved for the modified geometry. The results show that the addition of the boundary layer displacement thickness creates multiple solutions for the NACA0012 airfoil. Global linear stability analysis is also performed on the original airfoil and the modified airfoil. This shows a close relationship between the viscous unsteady shock buffet phenomenon of transonic airfoil flow and the existence of multiple solutions of the external inviscid flow." @default.
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- W2319176894 date "2013-06-22" @default.
- W2319176894 modified "2023-10-01" @default.
- W2319176894 title "Multiple Solutions and Buffet of Transonic Flow over the NACA0012 Airfoil" @default.
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- W2319176894 doi "https://doi.org/10.2514/6.2013-3026" @default.
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