Abstract
Boundary layer suction is applied to a turbulent boundary layer through a short strip of perforated wall to examine the development of near-wall coherent structures downstream of the suction area. Low-frequency fluctuations, which are markedly suppressed near the wall during relaminarization due to the boundary-layer suction, start to grow algebraically downstream of the suction area, leading to retransition to wall turbulence. The algebraic growth of near-wall low-frequency fluctuations in the retransition process is found to be due to appearance and development of near-wall low-speed streaks, which are responsible for by-pass boundary-layer transition caused by high-intensity background turbulence.
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