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We present new experimental results on the development of turbulent spots inchannel flow. The internal structure of a turbulent spot is measured, with TimeResolved Stereoscopic Particle Image Velocimetry. We report the observation oftravelling-wave-like structures at the trailing edge of the turbulent spot.Special attention is paid to the large-scale flow surrounding the spot. We showthat this large-scale flow is an asymmetric quadrupole centred on the spot. Wemeasure the time evolution of the turbulent fluctuations and the mean flowdistortions and compare these with the predictions of a nonlinear reduced ordermodel predicting the main features of subcritical transition to turbulence.

Turbulent spots in channel flow: an experimental study Large-scale flow, inner structure and low order model