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Velocity and front velocity measurements in experimental plane Couette flow

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We have designed a new experimental plane Couette flow in order to investigate the turbulent-laminar coexisting regimes appearing along the sub-critical transition to turbulence in this geometry. We present the phase diagram of this new experiment that is in the line of the previous setups. Particle Image Velocimetry (PIV), Laser Doppler Anemometry (LDA) and visualisations coupled with refined image processing algorithms are used to characterise the laminar-turbulent boundaries around growing turbulent spots and stable turbulent patterns.

Author(s):

Marie Couliou    
ENSTA-ParisTech
France

Romain Monchaux    
ENSTA-ParisTech
France