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Fluid-Structure Interaction of a Foiling Craft
RISE Research Institutes of Sweden, Safety and Transport, Maritime department. (SSPA)ORCID iD: 0000-0002-2736-0140
Chalmers University of Technology, Sweden.
Chalmers University of Technology, Sweden.
INP ENSEEIHT, France.
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2022 (English)In: Journal of Marine Science and Engineering, E-ISSN 2077-1312, Vol. 10, no 3, article id 372Article in journal (Refereed) Published
Abstract [en]

Hydrofoils are a current hot topic in the marine industry both in high performance sailing and in new passenger transport systems in conjunction with electric propulsion. In the sailing community, the largest impact is seen from the America’s cup, where boats are sailed at more than 50 knots (over 100 km/h) with 100% “flying” time. Hydrofoils are also becoming popular in the Olympics, as in the 2024 Olympic games 5 gold medals will be decided on foiling boats/boards. The reason for the increasing popularity of hydrofoils and foiling boats is the recent advances in composite materials, especially in their strength to stiffness ratio. In general, hydrofoils have a very small wetted surface area compared to the wetted surface area of the hull. Therefore, after “take-off” speed, the wetted surface area of the hull, and consequently the resistance of the boat, is reduced considerably. The larger the weight of the boat and crew and the higher the speeds, the greater the loads on the hydrofoils will be. The current research investigates the interaction effects between the fluid and structure of the ZP00682 NACRA 17 Z-foil. The study is carried out both experimentally, in SSPA’s cavitation tunnel, and numerically using a fully coupled viscous solver with a structural analysis tool. The experimental methodology has been used to validate the numerical tools, which in turn are used to reverse engineer the material properties and the internal stiffness of the NACRA 17 foil. The experimental flow speed has been chosen to represent realistic foiling speeds found in the NACRA 17 class, namely 5, 7, and 9 m/s. The forces and the deflection of the Z-foil are investigated, showing a maximum deflection corresponding to 24% of the immersed span. Finally, the effects of leeway and rake angles on the bending properties of the Z-foil are investigated to assess the influence of different angles in sailing strategies, showing that a differential rake set-up might be preferred in search for minimum drag. © 2022 by the authors. 

Place, publisher, year, edition, pages
MDPI , 2022. Vol. 10, no 3, article id 372
Keywords [en]
Experimental methods, Fluid structure interaction, Foiling, Numerical simulations
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:ri:diva-59153DOI: 10.3390/jmse10030372Scopus ID: 2-s2.0-85126562792OAI: oai:DiVA.org:ri-59153DiVA, id: diva2:1668298
Note

Funding details: Chalmers Tekniska Högskola; Funding text 1: Funding: Hugo Hammar’s funding from SSPA and Rolf Sörman’s funding from Chalmers University of Technology are acknowledged for providing the financial support to run the experimental tests at SSPA. This study received also funding from Chalmers University of Technology Foundation for the strategic research project Hydro-and aerodynamics.

Available from: 2022-06-13 Created: 2022-06-13 Last updated: 2023-04-28Bibliographically approved

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Marimon Giovannetti, LauraShiri, Alex

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