Investigation of viscosity influence on transonic flutter

The paper is devoted to computational study of transonic flutter when the viscosity can influence significantly on dynamic aeroelasticity characteristics of aircraft. The work has been done in the direction of development of methodology and software, which are used in ARGON (TsAGI) system for multidisciplinary analysis and optimization in airplane design. Considerable attention is paid to the validation of the proposed software. Experimental results of the NASA Common Research Model in the European Transonic Wind Tunnel (ETW) are used for comparison with computations. The results of flutter analysis are presented for the passenger middle range airplane with the high aspect ratio wing and the engine under the wing. Comparisons of aeroelasticity characteristics in transonic flow are carried out for cases of a set of Mach and Reynolds numbers. The computational results presented in the paper show the essential influence of transonic features on flutter characteristics.