Influence of Mesh Density and Turbulence Models on 2D Viscous Flutter in 11th Standard Configuration

In this study, numerical simulations of 2D viscous flutter were performed and compared with the available experimental results for different mesh density and different turbulence models. The calculations were carried out for bending oscillations of the cascade known as the Eleventh Standard Configuration. The ANSYS CFX v.12.1 code with SST, SA, k-ω turbulence models was used for calculations with various values of the inter-blade phase angle. Three moving H-O grids were used. Comparison of the calculated and the experimental results for the Eleventh Standard Configurations for the IBPA = 180 deg has shown good quantitative and qualitative agreement for local performances (unsteady pressure amplitude and phase distribution). For the IBPA = 90 and −90 deg the results are correct only in terms of amplitude. The phase distribution showed large deviations. The effect of various grids as well as SST, Spalart Allmaras and k-ω turbulence models was not significant in the subsonic case, but it turned out to be very noticeable in the transonic case.