Fluid Mechanics and Acoustics Laboratory - UMR 5509

LMFA - UMR 5509
Laboratoire de Mécanique des Fluides et d’Acoustique
Lyon
France


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Home > News > Seminars > 2017 Seminars

Romain Monchaux - ENSTA-ParisTech, Paris, France

Transition to turbulence in plane Couette flow

Vendredi 17 Nov 2017, 11h, ECL, bât W1 Amphi 1bis

Transition to turbulence in plane Couette flow

We experimentally and numerically investigate the temporal aspects of turbulent spot spreading in a plane Couette flow for transitional Reynolds number between 300 and 450. Spot growth rate, spot advection rate and large-scale flow intensity are measured as a function of time and Reynolds number. All these quantities show similar dynamics enlightening the role played by large scale flows in the advection of the turbulent spot. The contributions of each possible growth mechanisms as growth by advection or growth by destabilization are discussed for the different stage of spot growth. A scenario which gathers all this elements is suggested and enables a more complete understanding of the growth dynamics of turbulent spots.

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