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Variation of underwater appendages and their effects on wind powered ships
RISE Research Institutes of Sweden, Safety and Transport, Maritime department. (SSPA)ORCID iD: 0000-0002-2736-0140
RISE Research Institutes of Sweden, Safety and Transport, Maritime department. (SSPA)
RISE Research Institutes of Sweden, Safety and Transport, Maritime department. (SSPA)ORCID iD: 0000-0002-6266-2320
2021 (English)In: 7th High Performance Yacht Design Conference, HPYD 2021, The Royal Institution of Naval Architects , 2021Conference paper, Published paper (Refereed)
Abstract [en]

Assessing the manoeuvring performances of a ship early in the design stage is becoming ever more important, especially now that wind-assisted propulsion is radically increasing in popularity as a measure to reduce fuel consumption. For conventionally propelled vessels most of the forces are in the longitudinal direction. Some, relatively small, drift angles and rudder angles are encountered in order to compensate for side forces due to environmental conditions. For a wind-propelled vessel on the other hand, side forces are an inevitable consequence of the propulsion choice and it is of utmost importance to balance these side forces with a matching hydrodynamic design to efficiently propel the vessel forward avoiding travelling for longer periods of time. In order to counteract those large side forces, it is necessary to add underwater appendages. Their position along the hull will determine the centre of lateral resistance (CLR) that needs to be related to the aerodynamic centre of effort (CoE) in order to achieve a balanced ship. The research herein described, compares towing tank captive tests with Virtual Captive Tests (VCT) derived from Computational Fluid Dynamics (CFD) simulations and the effects of generated side forces and moments when the inflow angles are varied. Adding a set of diagonal foils to the hull, in the investigated case reduces the leeway angle of approximately 2 degrees in close-hauled conditions.

Place, publisher, year, edition, pages
The Royal Institution of Naval Architects , 2021.
Keywords [en]
Aerodynamics, Computational fluid dynamics, Ship propulsion, Yachts, Captive tests, Centre of efforts, Computational fluid dynamics simulations, Environmental conditions, Hydrodynamic design, Lateral resistance, Longitudinal direction, Underwater appendages, Hulls (ship)
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:ri:diva-57275Scopus ID: 2-s2.0-85104818904OAI: oai:DiVA.org:ri-57275DiVA, id: diva2:1616735
Conference
7th High Performance Yacht Design Conference, HPYD 2021, 11 March 2021 through 12 March 2021
Note

Funding details: TRV 2018/96451; Funding details: Kungliga Tekniska Högskolan, KTH; Funding text 1: The authors would like to acknowledge the collaboration with Wallenius Marine, especially with Mikael Razola, and KTH. Furthermore, the authors would like to thank the technicians within SSPA that have worked relentlessly to be able to deliver the towing tank campaign albeit the global pandemic. The work conducted for this research was supported by the Swedish Transport Agency under grant TRV 2018/96451.

Available from: 2021-12-03 Created: 2021-12-03 Last updated: 2023-04-28Bibliographically approved

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Marimon Giovannetti, LauraWerner, Sofia

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