Application of potential flow methods to fast displacement ships at transcritical speeds in shallow water |
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| Institution: | 1. Bombora Wave Power, 9 De Laeter Way, Bentley, WA 6151, Australia;2. Perth Hydro Pty Ltd, Level 29, 221?St Georges Terrace, Perth, WA 6000, Australia, Australia;3. Maritime Research Institute Netherlands, P.O. Box 28, 6700 AA Wageningen, The Netherlands;1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;2. College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China;3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China;1. LadHyX, CNRS – École Polytechnique, 91128 Palaiseau, France;2. Ingeniería Térmica y de Fluidos, Universidad Carlos III de Madrid, 28911 Leganés, Spain |
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| Abstract: | Computer codes implementing three different numerical methods for the prediction of ship squat at transcritical speeds in shallow open-water are tested. SlenderFlow is a potential flow code specifically for ships in very shallow water, based on partially dispersive slender body theory. Flotilla is a potential flow code based on fully dispersive thin-ship theory. Rapid is a general nonlinear free-surface panel code. Code predictions of transcritical sinkage, trim and resistance in laterally unrestricted water were compared to the experimental results of Graff (1964) for two Taylor series hulls in a finite-width towing tank. Once tank width effects were accounted for, each of the three codes was found to give good predictions within the valid range of the underlying theory. A simple method for estimating transcritical wave resistance from trim is presented. |
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| Keywords: | Ship squat Resistance Transcritical speed Linear potential flow |
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