Numerical simulations reveal that streamwise slots postpone laminar-turbulent transition in supersonic flow.
The paper presents results on the influence of a small depth grooves (slots) on the surface of a flat plate on the supersonic boundary layer transition using the method. Slots of different depths oriented along the flow are considered, with the corresponding Reynolds numbers based on the slot depth 0 ≤ Re ≤ 3000. The mean flow in the boundary layer at Mach number M = 2 is obtained by means of numerical simulations within the CFD package FlowVision. The disturbance spatial amplification rates were calculated using the linear stability theory. It is for the first time shown that application of streamwise slots on the surface of a flat plate allows to postpone the position of a supersonic boundary layer laminar-turbulent transition more downstream.
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Lysenko et al. (2025) studied this question.
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