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Flow field measurements from a Couette-Poiseuille experiment are used toexamine quantitatively certain steps of the self-sustained process (SSP) ofwall-bounded transition to turbulence. Although the different parts of the SSPhave been discussed at large in the literature, direct measurements fromexperiment are scarce and, to our knowledge, the present results are the firstto show, using a local analysis of the turbulent patterns, that: (1) theamplitude of streamwise rolls is related to streak waviness, bringing aquantitative picture to one of the main physical mechanisms of Waleffe's modelof SSP ; and (2), at low waviness, direct measurements of the correlationbetween the streak and roll amplitudes, respectively probed by the streamwiseand wall-normal velocity perturbations, quantify the lift-up effect.

Lift-up and streak waviness drive the self-sustained process in wall-bounded transition to turbulence