Hydrodynamic performance investigation on an upper and lower water exchange device |
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| Institution: | 1. Dept. of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, T6G 2R3, Canada;2. Engineering College, Ocean University of China, Qingdao, 266100, China;3. Shandong Province Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao, 266100, China;1. Fisheries Engineering Division, National Institute of Fisheries Science, 216, Gijang-haeanro, Gijang-eup, Gijang-gun, Busan, 46083, South Korea;2. Department of Marine Production Management, Chonnam National University, 50 Daehak-ro, Yeosu, Jeollananm-Do, 59626, South Korea;3. Division of Marine Production System Management, Pukyong National University, 45 Yongso-ro, Busan 48513, South Korea;1. Department of Biology and Centre for Coastal Studies and Aquaculture, University of New Brunswick, Ganong Hall, P. O. Box 5050, Saint John, New Brunswick E2L 4L5, Canada;2. School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University, Auburn, Alabama, USA;3. Department of Fisheries Science, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran;4. National Institute of Aquatic Resources, Technical University of Denmark, Lyngby, Denmark;5. Billund Aquaculture, Montanavej 2, DK-7190 Billund, Denmark;6. Mount Allison University, 62 York Street, Sackville, New Brunswick E4L 1E2, Canada;1. Fisheries and Oceans Canada, Gulf Fisheries Centre, 343 Université Ave., Moncton, NB, E1C 9B6, Canada;1. Craft & Hawkins, Department of Petroleum Engineering, Louisiana State University, 3207 Patrick F. Taylor Hall, Baton Rouge, LA, 70803, USA;2. Department of Biological & Agricultural Engineering, Louisiana State University, 149 E. B. Doran Building, Baton Rouge, LA, 70803, USA;3. Aquatic Germplasm and Genetic Resources Center, School of Renewable Natural Resources, Louisiana State University Agricultural Center, 2288 Gourrier Avenue, Baton Rouge, LA, 70820, USA;1. North Carolina State University, Department of Biological and Agricultural Engineering, Raleigh, NC, United States;2. North Carolina State University, Department of Civil, Construction, and Environmental Engineering, Raleigh, NC, United States;1. Associate Professor & Head, Department of Aquacultural Engineering, College of Fisheries Engineering, Tamil Nadu Fisheries University, Muttam Panangudi, Nagapattianam, 611002, India;2. Professor & Associate Dean, School of Civil Engineering, KIIT University, Bhubaneswar, Odisha, India;3. Assistant Professor (Rtd), Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur, 721302, West Bengal, India |
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| Abstract: | Water exchange is an important way to guarantee its good quality between surface and bottom seawater, and it plays a significant role in water environment and ecology as well as fish farming systems. The conceptual experiment (Yin et al., 2018) was extended to present an Upper and Lower Water Exchange Device for strengthening the vertical water exchange performance, and a 3-D CFD mathematical model combining with Reynolds-Averaged Navier-Stokes equations, standard k-ε equations and VOF technique was developed to investigate its hydrodynamic performance and the vertical water exchange capacity for regular waves. The extrapolated relative error and the grid convergence index were used to estimate the discretization error. A series of experiments were conducted to measure the wave surface and water velocity histories, the experimental data were used to validate the mathematical results, and they agreed well with each other. It was found that the inside water motion is determined mainly by the wave overtopping and water entrainment. Generally, the net flow rate decreases at first and then increases with increasing wave steepness. In addition, the ratio of crest freeboard height to incident wave height plays a significant role in water exchange performance. A small ratio leads to an upward movement of the inside water, whereas a high value contributes to a downward net flow to some extent. Finally, a simple formula on the net flow rate was deduced with the dimensional analysis method and the least squares method, and it was validated well with the related data. |
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| Keywords: | An upper and lower water exchange device Experiment Regular wave Water exchange Net flow |
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