Three dimensional model for particle saltation close to stream beds, including a detailed description of the particle interaction with turbulence and inter-particle collisions
Type
Conference PaperKAUST Department
Applied Mathematics and Computational Science ProgramEarth Science and Engineering Program
Environmental Science and Engineering Program
Numerical Porous Media SRI Center (NumPor)
Physical Science and Engineering (PSE) Division
Date
2012-04-26Online Publication Date
2012-04-26Print Publication Date
2011-05-19Permanent link to this record
http://hdl.handle.net/10754/564380
Metadata
Show full item recordAbstract
We present in this paper a new three-dimensional (3-D) model for bed-load sediment transport, based on a Lagrangian description. We analyze generalized sub-models for the velocities after collision and the representation of the bed-roughness. The free-flight sub-model includes the effect of several forces, such as buoyancy, drag, virtual mass, lift, Basset and Magnus, and also addresses the particle rotation. A recent methodology for saving computational time in the Basset force is also employed. The sub-models for the post-collision velocity and rotation are based on the conservation of linear and angular momentum during the collision with the bed. We develop a new 3-D representation for the bed roughness by using geometric considerations. In order to address the interaction of particles with the turbulent flow, we tracked the particles through a computed turbulent velocity field for a smooth flat plate. This velocity field was used as a surrogate of the 3-D turbulent conditions close to the bed in streams. We first checked that the basic turbulence statistics for this velocity field could be used to approximate those in an open-channel flow. We then analyzed the interaction of the sediment and the turbulence for a single and multiple particles. We compared numerical results with experimental data obtained by Niño and García (1998b). We show that model predictions are in good agreement with existing data, in the sand size range. © 2011 ASCE.Citation
Moreno, P. M., Bombardelli, F. A., Gonzalez, A. E., & Calo, V. M. (2011). Three Dimensional Model for Particle Saltation Close to Stream Beds, Including a Detailed Description of the Particle Interaction with Turbulence and Inter-Particle Collisions. World Environmental and Water Resources Congress 2011. doi:10.1061/41173(414)217Conference/Event name
World Environmental and Water Resources Congress 2011: Bearing Knowledge for SustainabilityISBN
9780784411735ae974a485f413a2113503eed53cd6c53
10.1061/41173(414)217