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Numerical investigation of particle saltation in the bed-load regime

Science China(Technological Sciences) 2014年第8期57卷 1500-1511页

作者： JI ChunNing ANTE Munjiza ELDAD Avital XU Dong JOHN Williams State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University School of Engineering & Materials Science Queen MaryUniversity of London

This paper numerically investigates particle saltation in a turbulent channel flow having a rough bed consisting of 2–3 layers of densely packed *** this study,we combined three the state-of-the-art 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 *** we verify our code by comparing the flow and particle statistical features with the published data and then present the hydrodynamic forces acting on a particle together with the particle coordinates and velocities,during a typical *** found strong correlation between the abruptly decreasing particle stream-wise velocity and the increasing 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,and particle density,*** physical process is different from that of particle entrainment in which turbulence coherence structures play an important *** distribution functions of several important saltation parameters and the relationships between them are *** results show that the saltating particles hitting the windward side of the bed particles are more likely to bounce off the rough bed than those hitting the *** on the above findings,saltation mechanisms of large grain-size particles in turbulent channel flow are presented.

关键词： particle saltation bed-load regime hydrodynamic forces turbulent channel flow

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