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APPENDAGES INVESTIGATION AND THEIR EFFECTS ON MANEUVERING COEFFICIENTS FOR APPLICATIONS IN WIND ASSISTED SHIPS
RISE Research Institutes of Sweden, Safety and Transport, Maritime department.ORCID iD: 0000-0002-2736-0140
RISE Research Institutes of Sweden, Safety and Transport, Maritime department.ORCID iD: 0000-0002-9360-078x
RISE Research Institutes of Sweden, Safety and Transport, Maritime department.
RISE Research Institutes of Sweden, Safety and Transport, Maritime department.ORCID iD: 0000-0002-6266-2320
2020 (English)Conference paper, Published paper (Refereed)
Abstract [en]

When designing a hull that needs to account for sails, either rigid or flexible, it is necessary to consider the larger leeway and heel angles deriving from the sails side-forces compared to a traditional ship. It is therefore necessary to explore the possibility of adding appendages to the hull to balance those forces, achieving an optimum trade-off between hydrodynamic efficiency and manoeuvrability. The possibility of numerically simulating the manoeuvre coefficients at design stage will increase the chances of understanding the behaviour of a ship from an early stage in the design process. The current research is based on the evaluation of hydrodynamic efficiency and manoeuvre coefficients of a hull with rudders and shafts in a pure resistance, self-propulsion and in a wind-assisted mode. Having assessed the performances of the vessel with a Velocity Prediction Program (VPP), an in-depth research on suitable appendages was performed to reduce the experienced leeway angle, and ultimately increase the performances of a wind-assisted ship, especially when subject to wind angles ranging between 40 and 80. Many CFD simulations were initially performed to assess the hydrodynamic characteristics of the hull in a range of flow directions, rudder angles, ship speed and combinations. Those simulations encompass the whole range of datapoint needed to describe the forces and moments acting on a wind-assisted ship, simulating a towing-tank captive test, namely performing a Virtual Captive Test (VCT) [1]. Three types of possible appendages used to increase the generated side-force of the wind-assisted vessel are further investigated and the advantages and disadvantages are described. The findings of those preliminary simulations are then used as a basis for a structured model testing campaign.

Place, publisher, year, edition, pages
2020.
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:ri:diva-72014OAI: oai:DiVA.org:ri-72014DiVA, id: diva2:1840293
Conference
5th Int Conf innovation in High Performance Sailing Yachts and Sail-assisted Ship Propulosion. Gothenburg, Sweden
Available from: 2024-02-23 Created: 2024-02-23 Last updated: 2024-02-23Bibliographically approved

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Marimon Giovannetti, LauraAlexandersson, MartinWerner, Sofia

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