Influence of the hybrid RANS/LES method type on simulation results of a shock wave-induced turbulent boundary layer separation

Simulations of a shock wave-induced turbulent boundary layer separation using scale-resolving methods of various types are presented. Hybrid methods of the IDDES family based on the linear eddy viscosity model SST and the non-Boussinesq SSG/LRR-$\omega$ model are compared. 4 variants of the method obtained by combining one of these models in the RANS sublayer and a subgrid-scale model based on one of them in the LES region are considered. The advantages of using a differential Reynolds stress model in each sublayer separately are investigated. The simulation results are compared with the published LES reference data. The length of the separation region, pressure and friction distributions along the wall, single-point probability density functions of the wall pressure, and interscale energy flux are analyzed. Low-frequency unsteady effects observed in the hybrid simulations are discussed.