The effect of spanwise wall oscillation on spatially developing compressible transitional boundary layers

Spanwise wall oscillation is an easily implemented active control scheme. It can delay the transition to turbulent flows in incompressible boundary layers under appropriate parameters. However, this delayed compressible has not yet been confirmed numerically. In paper, we perform a series of direct numerical simulations spatially developing subsonic layer with different spanwise periods and amplitudes. We numerically confirm The be explained by Stokes induced affecting streamwise vortices. superposed velocity vorticity observed weaken development instability original vortices parameters, leading transition. Furthermore, changes flow compressibility, as inferred from equation for divergence. enhanced compressibility around pre-transition regions also stabilizes causes