抄録
LES/RANS hybrid, LES and MILES simulations are applied to an axi-symmetric base flow for the supersonic flows at high Reynolds number. The idea of LES/RANS hybrid methodology is that RANS model is used in the boundary layer because of its low computational costs than LES, and LES is used in massively separated regions where unsteady flow structures are correctly captured. The subgrid-scale stresses are computed using the compressible form of Smagorinsky's model. Baldwin-Lomax model is applied to the RANS region. The LES/RANS hybrid simulations accurately capture the physics of turbulent flows. The reverse flow behind the base shows satisfactory agreement with the experimental data. The base pressure distributions, which is the primary parameter from the engineering interest, is in good agreement with the experimental results.
