Quantification of nonlinear effects in gust load prediction

Abstract

In this paper the quantification of nonlinear effects in the gust load prediction of transport aircraft configurations is addressed. Therefore, multi-disciplinary simulations of unsteady gust encounters are carried out based on Reynolds Averaged Navier-Stokes solutions. Nonlinear aeroelastic gust load analysis employing the Force Summation Method is conducted for the NASA Common Research Model at transonic speed. Additionally, gust loads based on time-linearized CFD are obtained for comparison with the nonlinear loads. Multiple discrete 1-cos gust profiles with different gust amplitudes and gust lenghts are investigated for the analysis of nonlinear effects like the existence of recompression shocks.