Scouring of a granular bed by dam break: Experimental study and numerical simulation by a VOF-LPT coupling |
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| Institution: | 1. EPROAD Research Unit, University of Picardie Jules Verne, IUT of Aisne, Saint Quentin, 02100, France;2. Hanoi University of Civil Engineering, Ha Noi, Viet Nam;1. Pars Oil and Gas Company, Tehran, Iran;2. School of Geology, College of Science, University of Tehran, Tehran, Iran;1. Department of Nature Engineering, Faculty of Agriculture and Natural Resources, Ardakan University, Ardakan, Iran;2. Department of Watershed Management Engineering, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Tehran, Iran;3. Khamsan Representative and Paired Watershed, Sanandaj, Kurdistan, Iran;1. Department of Watershed Management Engineering, Faculty of Natural Resources, Tarbiat Modares University, Noor 46417-76489, Iran;2. Agrohydrology Research Group, Tarbiat Modares University, Tehran 14115-336, Iran;1. Civil Engineering Department, L.D. College of Engineering, Ahmedabad, Gujarat, 380015, India;2. Vishwakarma Government Engineering College, Ahmedabad, Gujarat, 382424, India;3. Department of Civil Engineering, National Institute of Technology, Warangal, Telangana, India;1. Ministry of Education Key Laboratory of Water and Sediment Science, School of Environment, Beijing Normal University, Beijing 100875, China;2. State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China |
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| Abstract: | The first part of the research reported here consists of an experimental campaign to study the scouring of a granular bed (glass beads, sand) induced by a dam break in an open channel. Two configurations are considered: with and without cylinders. In the second part of this study, the volume of fluid method coupled with the shear stress transport turbulent model and the lagrangian particle tracking method is used to simulate the local scour processes. The four-way coupling is realized by considering the drag force and collisions between particles. Using a vortex map and velocity profiles, the flow dynamics and scour pattern can be studied. The current research also focuses on the profiles of the erodible particle bed and the sediment transport rate to study the effects of a cylinder on local scour. The presence of the cylinder increases the experimental erosion depth by up to 42%. It was found that for relatively close particle diameters (2 and 3 mm), a granular bed with larger porosity (larger diameter) erodes the most. Experimentally and numerically it was found that the center of the granular bed experiences more erosion compared to the channel sides. In the last part of the research, comparisons between the numerical results and the experimental data allowed risk areas to be identified and the roles of porosity, sediment density, and flow dynamics on erosion to be identified. |
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| Keywords: | Volume of fluid Lagrangian particle tracking Scour Granular bed Cylinder Dam break |
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