Numerical Investigation of transition delay for various controlled breakdown scenarios in a Mach 6 Boundary Layer using porous walls

摘要

The influence of porous walls on the transition process of a Mach 6 Boundary Layer for different controlled breakdown scenarios is investigated using temporal direct numerical simulations. This study focusses on the non-linear regime where prior studies have mainle focussed on the linear stage. The fundamental and subharmonic resonance scenario are compared for a smooth wall case and a porous wall geometry. The porous walls showed potential to delay transition for the fundamental resonance scenario. The goal in this paper is to show that for other breakdown scenarios the porous walls still remain effective in delaying transition.