Abstract
New experimental observations of the transition to turbulence in the plane Couette flow (PCF) allow us to identify the streaky structures previously observed on the turbulent spots border as pairs of streamwise counter-rotating vortices. The PCF is slightly modified by introducing a wire in its central plane, parallel to the spanwise direction. A destabilization then occurs and similar pairs of streamwise vortices are stabilized. Comparing the modified flow with analytical calculation and interpolating our results to the limit of an infinitesimal wire diameter, leads us to consider these structures as finite amplitude solutions in PCF.
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