Investigations on the porous resistance coefficients for fishing net structures |
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| Affiliation: | 1. Centre for Autonomous Marine Operations and Systems (AMOS), Department of Marine Technology, NTNU, NO-7491 Trondheim, Norway;2. CNR-INSEAN Italian Ship Model Basin, Via di Vallerano 139, 00128 Roma, Italy;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. Civil Engineering, Dalian Ocean University, Dalian 116023, China;1. University Pierre et Marie Curie-Paris 6, UMR 7190, Institut Jean Le Rond d׳Alembert, case 162, 75252 Paris Cedex 5, France;2. CNRS, UMR 7190, Institut Jean Le Rond d׳Alembert, 75252 Paris Cedex 5, France;3. IFREMER, Marine Structures Laboratory, 150 Quai Gambetta, 62321 Boulogne-sur-Mer, France;1. Key Lab. of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture, Guangzhou 510300, China;2. South China Sea Fisheries Research Institute, Guangdong Cage Engineering Research Center, Guangzhou 510300, China;3. Offshore Oil Engineering Company Limited, Tianjin 300452, China;1. SINTEF Fisheries and Aquaculture, P.O. Box 4762 Sluppen, NO-7465 Trondheim, Norway;2. Structural Impact Laboratory (SIMLab), Department of Structural Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway |
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| Abstract: | The porous media model has been successfully applied to numerical simulation of current and wave interaction with traditional permeable coastal structures such as breakwaters. Recently this model was employed to simulate flow through and around fishing net structures, where the unknown porous resistance coefficients were adjusted by fitting the available experimental data. In the present paper, a new approach was proposed to calculate the porous resistance coefficients based on the transformation of Morison type load model. The transformation follows the principle that the total forces acting on a net panel from Morison type load model should be equal to the forces obtained from the porous media model. In order to account for the interaction effects in-between the twines, two coefficients were introduced, and they were calibrated by minimizing the least square error function. Extensive validation cases were carried out to examine the performance of the numerical model. This includes steady current flow through plane net panels and circular fish cages, and wave interaction with plane net panels. A variety of fishing nets with different solidity ratios were used in the validation cases, from which it was seen that the overall agreement between the numerical and experimental results is fair. |
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| Keywords: | Porous media model Resistance coefficients Fishing nets Navier–Stokes equations |
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