Nonlinear Aerodynamic Forces on the Flat Plate in Large Amplitude Oscillation

Nonlinear aerodynamic forces on the flat plate subjected to a forced torsional oscillation of asymptotically varying amplitude at high reduced velocities are investigated by using computational fluid dynamics method integrated with continuous wavelet transform method. The domain decomposition algorithm is used in the numerical simulation to accommodate large amplitude oscillation of plate. The continuous wavelet transform is used to extract the instantaneous amplitude and phase features from the computed time histories of the asymptotically aerodynamic forces on the plate. The results show that the computed characteristics of the aerodynamic forces are in good agreement with the available experimental data. The nonlinear features of the aerodynamic forces are well revealed by the present method.