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Numerical models for evolution of extreme wave groups
Institution:1. UCL, Department of Civil Engineering, Gower Street, London WC1E 6BT, UK;2. NUS, Faculty of Engineering, Engineering Drive 2, 117578, Singapore;3. Cranfield University, School of Water, Energy and Environment, College Rd, Wharley End, Bedford, MK43 0AL, UK;1. Key Laboratory of Research on Marine Hazards Forecasting, National Marine Environmental Forecasting Center, No 8 Dahuisi Road, Haidian District, Beijing, China;2. Second Institute of Oceanography, MNR, No 36 Baochubei Road, Hangzhou, 310012, China;3. Key Laboratory of Habor, Coastal and Offshore Engineering, Beibu Gulf University, No 12 Binhai Avenue, Binhai New Town, Qinzhou, 535011, China;1. Department of Marine Environment and Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan;2. Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 81157, Taiwan;1. Australian Maritime College, University of Tasmania, Launceston, Tasmania, 7250, Australia;2. School of Marine Science and Ocean Engineering, Harbin Institute of Technology, Weihai, Shandong, 264209, China;1. Department of Mathematics, University of Oslo, PO Box 1053 Blindern, NO-0316 Oslo, Norway;2. Department of Mathematical Sciences, NTNU, NO-7491 Trondheim, Norway;3. Signal Theory and Communications Department, Superior Polytechnic School, University of Alcalá, Alcalá de Henares, 28805 Madrid, Spain;1. Department of Naval Architecture, Dalian University of Technology, Dalian 116023, PR China;2. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116023, PR China
Abstract:The paper considers the application of two numerical models to simulate the evolution of steep breaking waves. The first one is a Lagrangian wave model based on equations of motion of an inviscid fluid in Lagrangian coordinates. A method for treating spilling breaking is introduced and includes dissipative suppression of the breaker and correction of crest shape to improve the post breaking behaviour. The model is used to create a Lagrangian numerical wave tank, to reproduce experimental results of wave group evolution. The same set of experiments is modelled using a novel VoF numerical wave tank created using OpenFOAM. Lagrangian numerical results are validated against experiments and VoF computations and good agreement is demonstrated. Differences are observed only for a small region around the breaking crest.
Keywords:Lagrangian wave modelling  OpenFOAM  Wave groups  Breaking waves
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