Numerical modeling of scour and deposition around permeable cylindrical structures |
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| Authors: | Jiajia Pan Zhiguo He Wurong Shih Niansheng Cheng |
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| Institution: | 1. Ocean College, Zhejiang University, Hangzhou, 310058, China;2. Civil and Environmental Engineering, Lehigh University, Bethlehem, PA, USA;1. Environmental Microbial Genomics, École Centrale de Lyon, Université de Lyon, Ecully, 69134 CEDEX, France;2. Environmental Biotechnology Laboratory, School of Biotechnology, KIIT University, Bhubaneswar, Odisha, 751024, India;3. Wetland Research and Training Center, Chilika Development Authority, Department of Forest and Environment, Government of Odisha, Bhubaneswar, 751014, India;4. ISARA, Department of Agroecology and Environment, Lyon, 23 rue Jean Baldassini 69364 LYON CEDEX 07, France;1. Instituto Multidisciplinario de Biología Vegetal (CONICET). Avenue Vélez Sarsfield 1611, Córdoba, Argentina;2. Facultad de Ciencias Agropecuarias, Universidad Nacional de Córdoba. Ingeniero Agrónomo Félix Aldo Marrone 746, Córdoba, Argentina;3. INFIQC, Departament of Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba. Haya de La Torre and Medina Allende, Córdoba, Argentina;4. Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, 5403–1st Avenue South, Lethbridge, Alberta T1J 4B1, Canada;5. Department of Biological Sciences, University of Lethbridge, 4401 University Drive, Lethbridge, Alberta, T1K 3M4, Canada;1. Polish Academy of Sciences, Institute of Geography and Spatial Organization, Research Station in Szymbark, 38-311 Szymbark 430, Poland;2. Polish Academy of Sciences, Institute of Geography and Spatial Organization, Department Polish Academy of Sciences, Institute of Geography and Spatial Organization, Department of Geoenvironmental Research, ?w. Jana 22, 31-018 Kraków, Poland;3. The Jan Kochanowski University, Institute of Geography and Environmental Sciences, Uniwersytecka 7, 25-406 Kielce, Poland;4. Bar-Ilan University, Department of Geography and Environment, Ramat-Gan, 5290002 Israel;1. School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China;2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;1. Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran;2. Civil and Environmental Engineering and Water Engineering Research Institute, Tarbiat Modares University, Tehran, Iran |
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| Abstract: | Flow past wall-mounted cylindrical structures is commonly encountered in natural rivers where piers of bridge crossings or vegetation stalks are common within channels.In the current study,the influence of cylindrical structures on flow/bathymetric alterations for three different permeabilities is explored via two-dimensional numerical modeling.In model construction processes,the structure permeability is varied with the surface void ratio along the perimeter of the cylinder,i.e.the density of emergent and submerged solid elements is used to delineate the cylinder boundaries.The validation of this model is guaranteed through careful comparison with experimental data obtained for similar hydrodynamic conditions and cylinder properties.The validated model then is applied to investigate flow properties and scour and deposition patterns with structure permeabilities of 0.0,0.38,and 0.62.Simulated results show that a permeable structure has less impeding effects on flow than a solid cylinder.The wake velocity reduction decreases 38% with a 63% increase in the structure permeability due to increasing intensity of the bleeding flow through surface voids,causing less flow contraction and diversion,lower turbulent kinetic energy,and lower lee-side scour around the permeable structure and less deposition downstream under live-bed conditions. |
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| Keywords: | Structure permeability Scour and deposition Numerical modeling Flow characteristics |
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