Effect of streaks on hypersonic boundary layer linear instability

This numerical study delves into the complex dynamics of transitional hypersonic boundary layers, examining how streaks---elongated flow structures---affect linear instability mechanisms. By exploring the interplay between streak amplitude and boundary layer instabilities, the research uncovers intricate growth mechanisms of the first and second Mack modes, which differ significantly from idealized conditions without streaks. The study proposes a clear classification of growing instabilities and analyses modified growth trends. These insights provide valuable perspectives on potential pathways to turbulence in distorted boundary layers, contributing to advancements in transition prediction.