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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Acknowledgments
The Rich Passage Passenger Fast Ferry Study is funded under a federal grant program administered by the Federal Transportation Administration (FTA-WA-26-7007-2005), designed to support research and investigations of emerging transportation systems. IIHR’s modeling was sponsored by Pacific International Engineering PLLC contract # KT-05-343 under the administration of Dr. Philip D. Osborne and the Office of Naval Research grant N00014-05-1-0723 under the administration of Dr. Patrick L. Purtell. The authors acknowledge Dr. David Kring for providing the Havelock source code.
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Kandasamy, M., Ooi, S.K., Carrica, P. et al. CFD validation studies for a high-speed foil-assisted semi-planing catamaran. J Mar Sci Technol 16, 157–167 (2011). https://doi.org/10.1007/s00773-011-0120-7
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DOI: https://doi.org/10.1007/s00773-011-0120-7