Large-scale finite-wavelength modulation within turbulent shear flows.
We show that turbulent "spirals" and "spots" observed in Taylor-Couette and plane Couette flow correspond to a turbulence-intensity modulated finite-wavelength pattern which in every respect fits the phenomenology of coupled noisy Ginzburg-Landau (amplitude) equations with noise. This suggests the existence of a long-wavelength instability of the homogeneous turbulence regime.
Prigent
Arnaud
A
CEA-Service de Physique de l'Etat Condensé, Centre d'Etudes de Saclay, 91191 Gif-sur-Yvette, France.
Grégoire
Guillaume
G
Chaté
Hugues
H
Dauchot
Olivier
O
van Saarloos
Wim
W