Reduced Order Gust Response Simulation using Computational Fluid Dynamics

摘要: The investigation of gust response problems is a crucial and, if high accuracy desired, time consuming task. Since linear frequency domain methods have previously shown signicant reduction in computational cost for motion-induced aerodynamics, an extension towards excitation proposed. Time-domain signals are reconstructed by superposition responses at several discrete frequencies. Once solutions available, reduced order model constructed projecting the linearised Reynolds-averaged Navier-Stokes equations on combined modal basis. While eigenmodes accurate predicting structural vibration, additional modes from proper orthogonal decomposition capture aerodynamic eects due to excitation. For all two-dimensional NACA0012 aerofoil investigated sub- and transonic conditions. Limitations approach rst outlined increasing amplitude both operating points. Subsequently, worst case length search performed it that dependent orders magnitude compared original system.