Turbulence Modelling Approaches For Predicting Shockwave Boundary Layer Interaction In Hypersonic Conditions

Abstract

Shockwave boundary layer interaction (SWBLI) remains a critical challenge in hypersonic aerothermodynamics due to its strong influence on separation, heat flux amplification, and vehicle stability. This study evaluates the predictive capability of widely used turbulence models Spalart Allmaras (SA), k–ω SST, and Delayed Detached Eddy Simulation (DDES) for simulating SWBLI under Mach 7 conditions. A 2-D compression ramp configuration is modelled using a high-fidelity CFD solver. Results show that DDES captures separation length and shock-foot oscillations more accurately than RANS models, while k–ω SST performs moderately well with reduced computational cost. SA underpredicts separation but resolves attached boundary layers effectively. These findings highlight the importance of hybrid turbulence modelling in hypersonic applications