Bedload Transport. Part 2: The mobile granular Layer

Mickael Pailha (1) , Julien Chauchat (2) , Pascale Aussillous (1) , Marc Médale (1) , Elisabeth Guazzelli (1)

1 IUSTI - Institut universitaire des systèmes thermiques industriels
2 LEGI - Laboratoire des Écoulements Géophysiques et Industriels [Grenoble]

We present a joint theoretical, numerical, and experimental investigation of the mobile granular layer in bedload transport conditions for pipe flows. The theoretical approach uses a twophase model having a Newtonian rheology for the fluid phase and Coulomb-type friction for the particulate phase which has been recently proposed by Ouriemi et al. (2009a). This model has been implemented into a 3D numerical code by Chauchat and Médale (2010) which can describe bedload transport in square and circular cross-section ducts. The experiments are undertaken in a rectangular duct partially filled with transparent spherical particles driven by an index-matched fluid. Direct imaging of the particles and of the fluid in a vertical slice is obtained owing to the addition of fluorescing tracers and to the illumination of the duct by a laser sheet. The main quantity that will be examined and discussed is the velocity field.

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

Mickael Pailha, Julien Chauchat, Pascale Aussillous, Marc Médale, Elisabeth Guazzelli. Bedload Transport. Part 2: The mobile granular Layer. THESIS 2011, Apr 2011, France. pp.1-4. ⟨hal-00621057⟩