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NUMERICAL STUDY ON THE MIXING OF UNSORTED sediment particleS DISCHARGED INTO A CROSS-FLOW BY MULTIPHASE particle-IN-CELL (MP-PIC) METHOD

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International Journal of sediment Research 2007年第2期22卷 150-159页

作者： Jie GU1, Chiwai LI2, Hong YANG1 and Yong ZHAN31 Department of Environmental Engineering, College of Marine Science and Technology, Shanghai Fisheries University, 334 Jungong Road, Shanghai 200090, China2 Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, China3 Department of Environmental Engineering, College of Urban Construction and Environment, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China Shanghai Fisheries Univ Coll Marine Sci & Technol Dept Environm Engn Shanghai 200090 Peoples R China Hong Kong Polytech Univ Dept Civil & Struct Engn Kowloon Hong Kong Peoples R China Shanghai Univ Sci & Technol Coll Urban Construct & Environm Dept Environm Engn Shanghai 200093 Peoples R China

The mixing characteristics of dredged sediments of variable size discharged into cross-flow are studied by an Eulerian-Lagrangian method. A three-dimensional (3D) numerical model has been developed by using the modified k-ε parameterization for the turbulence in fluid phase/water and a Lagrangian method for the solid phase/sediments. In the model the wake turbulence induced by sediments has been included as additional source and sink terms in the k-ε model; and the trajectories of the sediments are tracked by the Lagrangian method in which the sediment drift velocities in cross-flow are computed by a multiphase particle-in-cell (MP-PIC) method and the diffusion process is approximated by a random walk model. The hydrodynamic behavior of dumped sediment cloud is governed by the total buoyancy on the cloud, the drag force on each particle and velocity of cross-flow. The cross-flow destroys more or less the double vortices occurred in stagnant ambience and dominates the longitudinal movement of sediment cloud. The computed results suggest satisfactory agreement by comparison with the experimental results of laboratory.

关键词： 3D numerical model Two-phase flow Eulerian-Lagrangian method sediment particle cloud Cross-flow Multiphase particle-in-cell (MP-PIC) method

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