High-Reynolds shallow flow over an inclined sinusoidal bottom

Louis-Romain Plumerault (1) , Dominique Astruc (1) , Olivier Thual (1)

1 IMFT - Institut de mécanique des fluides de Toulouse

An experimental study of a turbulent free-surface shallow flow over an inclined sinusoidal bottom with a fixed corrugation amplitude is presented. A parametric analysis is performed by varying both the inclination angle and the Reynolds number. We show that a "Pulse-Waves" regime, dominant for Reynolds smaller than 4 000, coexists with a "Roll-Waves" regime, which becomes dominant above this value. The relative energy of the waves is quantified in the parameter space. At Reynolds numbers larger than 8 000, these wave instabilities disappear.

Mots clés: Inclined channel; Corrugated bottom; Roll Waves; Pulses

Domaines: Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]

Louis-Romain Plumerault, Dominique Astruc, Olivier Thual. High-Reynolds shallow flow over an inclined sinusoidal bottom. Physics of Fluids, 2010, vol. 22, pp. 054110-1-054110-5. ⟨10.1063/1.3407668⟩. ⟨hal-00960256⟩