Numerical investigation of local scour at two adjacent cylinders |
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| Institution: | 1. School of Computing, Engineering and Mathematics, University of Western Sydney, Penrith 2751, NSW, Australia;2. Institute for Infrastructure Engineering, University of Western Sydney, Penrith 2751, NSW, Australia;3. School of Civil, Environmental and Mining Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;4. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;1. River and Coastal Research Division, Korea Institute of Civil Engineering and Building Technology, 283, Goyangdae-Ro, Ilsanseo-Gu, Goyang-Si, 411-712, South Korea;2. Deltares Software Centre, Deltares, Rotterdamseweg 185, 2629 HD Delft, Netherlands;3. Division of Field Engineering for Environment, Graduate School of Engineering, Hokkaido University, North 13, West 8, Kita-ku, Sapporo, 060-8628, Japan |
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| Abstract: | Local scour around cylinders in a side-by-side or tandem arrangement under clear-water conditions is investigated numerically. Large eddy simulations with a Smagorinsky subgrid model are combined with a ghost-cell immersed boundary method, and details of the bed scouring are realized with sophisticated sediment and morphodynamic models. The scour patterns and depths in the two-cylinder cases are shown to be significantly influenced by the cylinder spacing. The features of the scour evolution, depth, and flow fields for a range of cylinder spacings are discussed. The maximum scour depth in the side-by-side cylinder cases increases as the distance between the cylinders decreases, whereas in the tandem cases, it tends to initially increase with increasing distance between the cylinders, after which it gradually decreases beyond the peak point. The maximum scour depths and trends computed using the present model show good agreement with the measured data in the literature. |
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| Keywords: | Cylinder Morphodynamics Local scour Large eddy simulation Sediment transport |
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