Experimental and numerical investigation of a freefall wedge vertically entering the water surface |
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| Institution: | 1. Centre for Autonomous Marine Operations and Systems (AMOS), Norwegian University of Science and Technology, N-7491 Trondheim, Norway;2. CNR-INSEAN: Italian Research Council – Institute for Marine Technology, Roma, Italy;1. CNR-INSEAN – Marine Technology Research Institute, Rome, Italy;2. German Aerospace Center (DLR) – Institute of Structures and Design, Stuttgart, Germany;3. AIRBUS DEFENCE AND SPACE – Military Transport Aircrafts, Getafe, Spain;1. University of St. Thomas, School of Engineering, 2115 Summit Ave, St. Paul, MN 55105-1079, USA;2. University of Minnesota, Department of Mechanical Engineering, 111 Church St. SE, Minneapolis, MN 55455-0111, USA;3. ENEA, UTMAR-OSS, Forte S. Teresa, 19032 Pozzuolo di Lerici, Italy;1. Department of Mechanical and Aerospace Engineering, New York University Polytechnic School of Engineering, 6 MetroTech Center, Brooklyn, NY 11201, USA;2. Università degli Studi Niccolò Cusano, Via Don Carlo Gnocchi 3, 00166 Rome, Italy;1. Mechanics of Materials and Structures, Department of Materials Science and Engineering, Ghent University, Technologiepark-Zwijnaarde 903, 9052 Zwijnaarde, Belgium;2. Mechanics, Materials and Processes, Catholic University College Sint-Lieven, Gebroeders Desmetstraat 1, 9000 Gent, Belgium;3. Department of Coastal Engineering, Ghent University, Technologiepark-Zwijnaarde 904, 9052 Zwijnaarde, Belgium |
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| Abstract: | Experiments and numerical methods are developed to investigate the water entry of a freefall wedge with a focus on the evolution of the pressure on the impact sides (the side contacting water) and the top side (the dry side on the top of the wedge), evolution of the global hydrodynamic loads, evolution of the air–water interface, and wedge motion. It is found that a typical water entry of a freefall wedge can be divided into slamming, transition, collapse and post-closure stages. A single-fluid numerical model is presented to simulate the first three stages. The results are compared to experiments and good agreements are obtained. A two-fluid BEM is proposed to investigate the influence of the air flow before the closure of the cavity created on the top of the wedge. It is found that for the closure of the 2D cavity, the air flow starts to play an important role just before closure but due to the short duration, the influence of air flow on the body velocity and configuration of the air–water interface is limited. |
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| Keywords: | Wedge Water entry Free surface Loads Cavity Two-fluid BEM |
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