CFD validation studies for a high-speed foil-assisted semi-planing catamaran |
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Authors: | Manivannan Kandasamy Seng Keat Ooi Pablo Carrica Frederick Stern Emilio F Campana Daniele Peri Philip Osborne Jessica Cote Neil Macdonald Nic de Waal |
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Institution: | (1) University of Iowa, Iowa City, IA, USA;(2) INSEAN, Rome, Italy;(3) Golder Associates Inc., 18300 NE Union Hill Road, Suite 200, Redmond, WA 98052, USA;(4) Coldwater Consulting, Gloucester, ON, Canada;(5) Technicraft Ltd., Birkenhead, Auckland, New Zealand; |
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Abstract: | This paper details the CFD validation studies carried out as a prerequisite for multi-fidelity CFD-based design optimization
of high-speed passenger-only ferries aimed at reducing far-field wake energy that causes beach erosion. A potential flow program
(WARP) and a URANS program (CFDSHIP) were validated using full-scale measurements of resistance, sinkage, trim, and far-field
wake train obtained over a wide range of speeds for two high-speed semi-planing foil-assisted catamarans: Spirit (LOA-22 m)
and 1060 (LOA-17 m). This study posed a unique combination of challenges for CFD modeling: the foil appended geometry required
complicated surface overset grids, the effect of the waterjet and wind resistance had to be modeled, and a method had to be
devised to extrapolate the calculated near-field elevation to get the far-field wake train using Havelock sources. A more
concentrated effort was applied to the URANS verification and validation which forms the focus of this paper. The results
show that URANS is able to accurately predict the resistance and motions for both vessels when coupled with models that account
for the propulsors and air resistance. The overall accuracy of URANS for the performance analysis of the foil-assisted, semi-planing
catamarans was adequate to warrant its use as a tool for subsequent design and optimization of a new vessel with significantly
reduced wakes. |
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