Sediment dynamics. Part 2. Dune formation in pipe flow

Malika Ouriemi (1) , Pascale Aussillous (2) , Elisabeth Guazzelli (2)

1 IFPEN - IFP Energies nouvelles
2 IUSTI - Institut universitaire des systèmes thermiques industriels

We present a phase diagram of the different dune patterns observed when a bed composed of spherical particles is subjected to a pipe flow. While the threshold for incipient motion is determined by the Shields number, that for dune formation seems to be controlled by the Reynolds number. A simple linear stability analysis based on a particle flux derived by Ouriemi, Aussillous & Guazzelli (J. Fluid Mech., 2009) accounts reasonably well for the experimental observations.

Domaines: Matière Molle [cond-mat.soft]; Mécanique des fluides [physics.class-ph]

Malika Ouriemi, Pascale Aussillous, Elisabeth Guazzelli. Sediment dynamics. Part 2. Dune formation in pipe flow. Journal of Fluid Mechanics, 2009, 636, pp.321-336. ⟨10.1017/S0022112009007927⟩. ⟨hal-01432009⟩