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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 5 - FLUVIAL HYDRAULICS AND RIVER MANAGEMENT : Numerical Simulation of Bed-load Transport in Turbulent Channel Flow
Numerical Simulation of Bed-load Transport in Turbulent Channel Flow
Author : Chunning Ji, Ante Munjiza, Eldad Avital and John Williams
This paper numerically investigates the particle saltation in a turbulent channel flow having a rough bed consisting of 2-3 layers of densely packed spheres. In this study, we combined three technologies, i.e., the direct numerical simulation of turbulent flow, the combined finite-discrete element modelling of the deformation, movement and collision of the particles, and the immersed boundary method for the fluid-solid interaction problem. Here we present the hydrodynamic forces acting on a particle, together with the particle coordinates and velocities, during a typical saltation. We found the strong correlation between the abrupt decreasing of the particle stream-wise velocity and increasing of the particle vertical velocity at collision which indicates that the continuous saltation of large grain-size particles is controlled by collision parameters such as particle incident angle, local rough bed packing arrangement, particle density, etc. This physics is different from that for large grain-size particle entrainment on which turbulence coherence structures play an important role.
File Size : 496,677 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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