Shock buffet is an aerodynamic instability characterized by self-sustained shock oscillations that occurs at transonic Mach numbers and moderate angles of attack on both airfoil and wing configurations. Shock buffet involves shock oscillations and boundary layer separation and re-attachment without any structural excitation. As the shock-buffet oscillations occur at low frequencies, close to the structural natural frequencies of aircraft wings, it excites a structural dynamic response that might result in unstable fluid-structure interactions (FSI). Our research explores the nature and characteristics of shock-buffet on 2D and 3D configurations, aeroelastic interactions at transonic flow conditions where shock-buffet exists, and flutter envelope determination at these conditions. Understating the shock-buffet and transonic FSI phenomena is crucial for the determination of the flight envelope of transonic cruisers and for developing control strategies to mitigate buffet and increase flight envelopes.
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Lior Poplingher’s talk at the 2023 SciTech
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Lior Poplingher
Collaborators/alums: Michael Iovnovich
Journal Publications
- L. Poplingher and D.E. Raveh, “Comparative Modal Study of the Two-Dimensional and Three-Dimensional Transonic Shock Buffet,” AIAA Journal.
- L. Poplingher, D.E. Raveh, and E.H. Dowell “Modal Analysis of Transonic Shock Buffet on 2D Airfoil,” AIAA Journal, Vol. 57, No. 7, 2019, pp. 2851–2866.
- D.E. Raveh, Y. Mor-Yossef, and Y. Levy, “Analyses for the Second Aeroelastic Prediction Workshop Using the EZNSS Code,” AIAA Journal, Vol. 56, No. 1, 2018, pp. 387–402.
- M.Iovnovich, D.E.Raveh, M. Adar, and D. Michaels, “Computational Study of Transonic Limit Cycle Oscillation Phenomenon on the F-16 Fighter Aircraft,” Journal of Aircraft, Vol.54, No.2, 2017, pp.783-793.
- M. Iovnovich and D.E. Raveh “Numerical Study of Shock-buffet on 3D Wings,” AIAA Journal, Vol. 53, No. 2, 2015, pp.449-463.
- D.E. Raveh and E.H. Dowell, “Aeroelastic Responses of Elastically Suspended Airfoil Systems in Transonic Buffeting Flows,” AIAA Journal, Vol. 52, No. 5, 2014, pp. 926-934.
- M. Iovnovich and D.E. Raveh “Reynolds-averaged Navier-Stokes Study of the Shock-buffet Instability Mechanism,” AIAA Journal, Vol. 50, No. 4, 2012, pp. 880-890.
- M. Iovnovich and D.E. Raveh “Transonic Unsteady Aerodynamics in the Vicinity of Shock-buffet Instability,” Journal of Fluids and Structures, Vol. 29, 2012, pp. 131-142.
Conference Papers
- L. Poplingher and D.E. Raveh “Stall Flutter of the Benchmark Supercritical Wing at High Angles of Attack,” AIAA SciTech, January 2023.
