Investigation on flutter stability of the DLR-F19/SACCON configuration

Abstract

In the present work, flutter stability studies of an unmanned flying-wing configuration are presented. For this purpose, different fidelity modeling methods (DLM, CFD-Euler and CFD-RANS) are considered. The dependence of flutter speeds on altitude and Mach number is examined, showing that aerodynamic potential-based methods cannot predict aerodynamic phenomena such as flow detachment occurring at high angles of attack. In this respect, it is important that flutter investigations industry-oriented calculation methods are compared with the results obtained by high-fidelity CFD methods.