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High-Reynolds shallow flow over an inclined sinusoidal bottom

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



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