Numerical investigation on the hydrodynamic performance of fast SWATHs with optimum canted struts arrangements |
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Affiliation: | 1. Naval Architecture and Marine Engineering Unit, DITEN, University of Genoa, Italy;2. Department of Aerospace and Ocean Engineering, Virginia Tech, Blacksburg, VA, USA;1. Research Center, NextFOAM Co., Ltd., Seoul 153-709, Republic of Korea;2. Dept. of Naval Arch. and Ocean Eng., Inha University, Incheon 402-751, Republic of Korea |
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Abstract: | Small Waterplane Area Twin Hulls (SWATHs) are known to have superior seakeeping performance but higher resistance compared to equivalent catamarans or mono-hulls. A way to improve their resistance characteristics is to use unconventional hull forms parametrically defined and optimized by CFD methods. This study builds on previous SWATH optimization studies proposing a comprehensive, systematic investigation on the effect of different shapes and canting angles of the struts. For the first time we demonstrate the importance of considering the shape of the strut that is fully parametrized in our study. The effect of the design speed on the best shape is addressed through a multi-objective optimization targeting the minimum total resistance at two very different speeds, namely the cruise and slow transfer speeds. Optimum hull shapes are discussed in terms of maximum resistance reduction, together with the predicted free waves patterns. |
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Keywords: | Unconventional Small Waterplane Area Twin Hull (SWATH) Canted multi-struts Full parametric shape model Multi-objective optimization Boundary Element Method (BEM) Wave resistance Genetic algorithms |
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