Numerical investigation of the influence of geometrical parameters on shock wave structure of a flow over a compression ramp

Abstract

In this study, wall modeled large-eddy simulations (LES) were performed with a finite volume method for a 25∘ compression-expansion ramp to investigate the different aspects of the 3D interaction of shock wave with a turbulent boundary layer. The hybrid initialization and dynamic grid adaption techniques were employed to decrease the computational cost and numerical errors. Shadowgraph contours, presenting Laplacian of density, were used to analyze structures of fine flow to have a distinct illustration of shock-wave structures. The simulated results were validated against experimental data in the same geometrical and boundary conditions. According to wall pressure distribution and averaged velocity profiles, there was a good agreement between current numerical results and available data. After validating the numerical methodology, the effects of arched and curved surfaces as passive control methods on shock wave boundary layer interaction (SBLI) were investigated. The results showed that using arched and curved surface, the separation zone can diminish; therefore, these two ways are the efficient passive control methods to reduce the strength of the shock waves.