Numerical Simulations of Nonlinear Post-Critical Vibrations of an Airfoil After Flutter Instability

0361340 - ÚT 2015 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Horáček, Jaromír - Feistauer, M. - Sváček, P.
Numerical Simulations of Nonlinear Post-Critical Vibrations of an Airfoil After Flutter Instability.
978-0-7918-4454-0. In: Proceedings of the ASME 2011 PVP Conference. Baltimore: ASME, 2011, s. 435-444. ISBN 978-0-7918-4454-0.
[ASME 2011 Pressure Vessels & Piping Division Conference. Baltimore (US), 17.07.2011-21.07.2011]
Grant CEP: GA ČR(CZ) GAP101/11/0207
Výzkumný záměr: CEZ:AV0Z20760514
Klíčová slova: aeroelasticita * FEM * 3-DOF airfoil
Kód oboru RIV: BI - Akustika a kmity

The contribution deals with the numerical simulation of the flutter of airfoil with three degrees of freedom for rotation around an elastic axis, oscillation in the vertical direction and rotation of a flap. The FE solution of (2-D) incompressible Navier-Stokes equations is coupled with nonlinear equations describing the airfoil vibrations with large amplitudes taking into account the nonlinear mass matrix. The time-dependent computational domain and a moving grid are treated by the ALE method. The developed method was successfully tested by the flutter computation using NASTRAN program and then applied to the simulations of the post flutter regimes in time domain showing Limit Cycle Oscillations (LCO) for the airfoil NACA 0012 respecting the air space between the flap and the main airfoil.
Trvalý link: http://hdl.handle.net/11104/0198676