Numerical simulation of incipient particle motion |
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| Authors: | Ali Nasrollahi Ali Akbar Salehi Neyshabouri Goodarz Ahmadi Masoud Montazeri Namin |
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| Institution: | 1. Civil Engineering Department, Tarbiat Modares University, Tehran, Iran;2. Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, NY 13699-5725, USA;3. Civil Engineering Department, University of Tehran, Tehran, Iran;1. Industry-Academia Collaboration Foundation, Chonbuk National University, 567 Baejedae-ro, Deokjin-gu, Jeonju, 54896, Republic of Korea;2. Center for Jeongeup Industry-Academy Cooperation, Chonbuk National University, 9 Cheomdan-ro, Jeongeup, Jeonbuk, 56212, Republic of Korea;1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin (SKL-WAC), Beijing, China;2. China Institute of Water Resources and Hydropower Research (IWHR), Beijing, China;3. Surveying Design and Research Institute of Yellow River Henan Province, Zhengzhou, China;4. Jingjiang Bureau of Hydrology and Water Resources Survey, Changjiang Water Resources Commission, Jingzhou, China;1. Irstea, UR RiverLy, centre de Lyon-Villeurbanne, 5 Rue de la Doua, CS 20244, F-69625 Villeurbanne cedex, France;2. EDF R&D, 6 quai Watier, 78401 Chatou cedex, France;1. Dr. and Prof., State Key Laboratory of Water Resources and Hydropower Engineering Sciences, Wuhan University, Wuhan 430072, China;2. Dr., State Key Laboratory of Water Resources and Hydropower Engineering Sciences, Wuhan University, Wuhan 430072, China;3. PhD. candidate, State Key Laboratory of Water Resources and Hydropower Engineering Sciences, Wuhan University, Wuhan 430072, China |
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| Abstract: | A two-dimensional(2 D) computational model for simulation of incipient sediment motion for noncohesive uniform and non-uniform particles on a horizontal bed was developed using the Discrete Element Method(DEM).The model was calibrated and verified using various experimental data reported in the literature and compared with different theories of incipient particle motion.Sensitivity analysis was done and the effects of relevant parameters were determined.In addition to hydrodynamic forces such as drag,shear lift and Magnus force,the particle-particle interaction effects were included in the model.The asymptotic critical mobility number was evaluated for various critical particle Reynolds numbers(R*) in the range of very small and very large R*.The obtained curve is classified into four regions.It was found that in the linear region,the drag force has the principal role on the initiation of motion.Moreover,the critical mobility number is independent of particle diameter.A procedure for estimating the critical shear velocity directly from the information on particle diameter and roughness height was developed.Finally,the mechanism of incipient motion for the different regions was studied and the effect of different forces on the incipient particle motion was obtained.It was found that the maximum effects of lift and Magnus forces were,respectively,less than ten and twenty percent of the total force.The drag force,however,was typically the dominant force accounting for majority of the net hydrodynamic force acting on sediment particles at the onset of incipient motion. |
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| Keywords: | Incipient motion Shields curve Numerical simulation Drag force Lift force Magnus force Discrete Element Method |
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