Steaming on Convex Hulls

Transportation Research Procedia, 2016

The slow steaming approach is increasing in popularity for commercial vessels, as it provides a method of reducing fuel use, and therefore operating costs, in the current economic climate. It is very important to be able to evaluate a ship's response to waves, because any added resistance or loss of speed may cause delays or course alterations, leading to financial losses. Potential flow theory based linear strip theory is still a widely used method among naval architects, due to its fast solutions with sufficient engineering accuracy. The key objective of this study is to predict the ship motions and added resistance of the S-175 containership, and to estimate the increase in effective power and fuel consumption due to its operation in regular and irregular head seas. The analyses were performed at design and slow steaming speeds, for a range of wave conditions in regular seas, and for three different sea states in irregular seas. The results obtained at a ship speed corresponding to Froude number 0.25 were compared to available experimental data and were found to be in good agreement with the experiments. The numerical analyses were carried out using VERES, which is based on potential flow theory.

2018

TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation, 2013

The International Maritime Organization (IMO), through its Maritime Environmental Protection Committee (MEPC), has been carrying out substantive work on the reduction and limitation of greenhouse gas emissions from international shipping since 1997, following the adoption of the Kyoto Protocol and the 1997 MARPOL Conference. While to date no mandatory GHG instrument for international shipping has been adopted, IMO has given significant consideration of the matter and has been working in accordance with an ambitious work plan with a view to adopting a package of technical provisions. Beside the efforts undertaken by IMO, it is assumed that e.g. optimized manoeuvring regimes have potential to contribute to a reduction of GHG emissions. Such procedures and supporting technologies can decrease the negative effects to the environment and also may reduce fuel consumption. However, related training has to be developed and to be integrated into existing course schemes accordingly. IMO intends to develop a Model Course aiming at promoting the energy-efficient operation of ships. This Course will contribute to the IMO's environmental protection goals as set out in resolutions A.947(23) and A.998(25) by promulgating industry "best practices", which reduce greenhouse gas emissions and the negative impact of global shipping on climate change. In this paper the outline of the research work will be introduced and the fundamental ideas and concepts are described. A concept for the overall structure and the development of suggested detailed content of the draft Model course will be exemplarily explained. Also, a developed draft module for the model course with samples of the suggested integrated practical exercises will be introduced and discussed. The materials and data in this publication have been obtained partly through capacity building research project of IAMU kindly supported by the International Association of Maritime Universities (IAMU) and The Nippon Foundation in Japan. http://www.transnav.eu the International Journal on Marine Navigation and Safety of Sea Transportation Volume 7 Number 2

2018

This is a Master´s Thesis written at the Geophysical Institute at the University of Bergen. The work represents the end of a Master in Renewable Energy. The aim of this project has been to develop a tool and a method for ship energy analysis including emissions, efficiency and costs. The complexity of the tool made it necessary to cooperate with several sponsors and partners. Researcher Tjalve Magnusson Svendsen from Prototech AS has been the man supervisor for the student through the project. The results are a product of a close cooperation between the student and Mr. Svendsen. The student is grateful for all the help provided, and for the understanding and advises given through the two semesters. Without Mr. Svendsen the result would not have been what it is. Many thanks to Tjalve Magnusson Svendsen and Prototech AS. Professor Peter M. Haugan from Geophysical Institute has been supporting the project as a cosupervisor through the two semesters. Peter has been a supportive contributor for the results presented. Mr. Haugan has also been very helpful in arranging the study trip to Tokyo and giving advises in report writing. Without Mr. Haugan the result would not have been what it is. Many thanks to Peter M. Haugan. R&D Manager Kristian Voksøy Steinsvik from Havyard Design & Solutions AS has been supporting the project as the second co-supervisor. The student had the pleasure of spending several periods in Havyard´s offices to cooperate with Havyard to develop the tool. Mr. Steinsvik has also been a key partner in developing the method used in the tool by advises and support. Without Mr. Steinsvik the result would not have been what it is. Many thanks to Kristian Voksøy Steinsvik. The University of Bergen has provided help, support and advises for the project since the beginning. Several professors, scientists and engineers currently working for the Geophysical institute has been willing to answer question, share knowhow and give advises to the student. Senior Executive Officer Elisabeth Aase Saether has been very helpful during the two years at the university. The student is really grateful for the two years he has been student at the Geophysical Institute at the University of Bergen. The BKK-UiB cooperation has supported the project with 50 000 NOK. Without these funds, much of the work in this master´s thesis would not have been possible. In addition to the 50 000 NOK from the BKK-UiB cooperation, Hordaland County Council has supported the project with 9000 NOK. The student is very grateful for the funds granted from these two contributors. Havyard Design & Solution AS has also been supporting the project with advisors, data, technical equipment and funds for travelling. Many thanks to the management in Havyard Design & Solutions AS for all help and support during these two semesters. Norsk Fisketransport AS allowed the student to spend 10 days onboard the Live Fish Carrier NFT Steigen. The generosity of Norsk Fisketransport AS and the excellence and hospitality of the crew on board NFT Steigen helped the student improve the method and the tool. It was 10 educational days in good company. A special thanks to Captain Kent Sjåvik for being service minded, hospitable and willing to answer questions. Lars Kolle, author of the book "Håndbok for prosjektering av brennstofføkonomisk fartøy" donated the student a copy of the book. Many thanks to Mr. Kolle for his generousity. Assistant Professor Svein Anond Anondsen donated the book "SIN 0501-Marin Teknikk 1", which played an important role in the ship design part of the tool. Many thankts to Mr.

2016

With the growth of shipping industry, voyage optimisation attracts attention as a way of improving energy efficiency of ship operations. It is not only related to the commercial benefit for a single shipment, but also affects ship design and shipping schedule etc. In this paper, a relatively advanced voyage optimisation model towards energy efficient shipping is introduced, which has comprehensive function modules, including grids system design and weather routing etc while taking into account the alternative energy saving devices. Through voyage optimisation, this model can provide the stakeholders a platform to develop more economical and reliable shipping route between different ports under various sea states. A case study using a bulk carrier as ship model is taken at last to prove the tool’s validity.

Bulletin of the Karaganda University. "Physics" Series, 2020

The article discusses the issues of automatic control of the vessel’s movement using excessive control, which allows to organize the movement of the vessel without a drift angle, to reduce the hydrodynamic resistance and fuel consumption. Issues of reducing energy consumption and fuel economy on board, as well as related issues of reducing emissions and improving the environment are especially relevant at the present time. A brief review of literature devoted to improving the energy efficiency of ships was carried out. As a result of the analysis, it was found that the issues of improving energy efficiency are solved in various ways, for example, constructively, by reducing weight, hydrodynamic and aerodynamic drag of the hull, using a sail, creating more advanced power plants, however, the authors have not found methods and algorithms for reducing hydrodynamic drag and fuel consumption through the use of excessive control. It is concluded that the development of such systems is rel...

ISBN: 978-1-118-85551-5 , 2019

Table of Contents and Preface of L. Birk (2019). Fundamentals of ship hydrodynamics: fluid mechanics, ship resistance and propulsion. Wiley, first edition. ISBN: 978-1-118-85551-5 Fundamentals of Ship Hydrodynamics is designed as a textbook for undergraduate education in ship resistance and propulsion. The book provides connections between basic training in calculus and fluid mechanics and the application of hydrodynamics in daily ship design practice. Based on a foundation in fluid mechanics, the origin, use, and limitations of experimental and computational procedures for resistance and propulsion estimates are explained. The book is subdivided into fifty-one chapters, providing background material for individual lectures. The unabridged treatment of equations and the extensive use of figures and examples enable students to study details at their own pace. Key features: • Covers the range from basic fluid mechanics to applied ship hydrodynamics. • Subdivided into 51 succinct chapters. • In-depth coverage of material enables self-study. • Around 300 figures and tables. Fundamentals of Ship Hydrodynamics is essential reading for students and staff of naval architecture, ocean engineering, and applied physics. The book is also useful for practicing naval architects and engineers who wish to brush up on the basics, prepare for a licensing exam, or expand their knowledge.

The 2012 guidelines on the method of calculation of the attained Energy Efficiency Design Index (EEDI) for new ships, MEPC.212(63), represent a major step forward in implementing energy efficiency regulations for ships through the introduction of the EEDI limits for various types of ships. There are, however, serious concerns regarding the sufficiency of propulsion power and steering devices to maintain manoeuvrability of ships in adverse conditions, hence regarding the safety of ships, if the EEDI requirements are achieved by simply reducing the installed engine power. This was the rationale for a new EU funded research project with the acronym SHOPERA (2013-2016), aiming at developing suitable methods, tools and guidelines to effectively address the above concerns. The paper discusses the background of the conducted research of SHOPERA, presents early results of the project and elaborates on the criteria for ship's manoeuvrability and safety under adverse conditions.

Polish Maritime Research

Recently, there has been a significant development of ecological propulsion systems, which is in line with the general trend of environmentally friendly “green shipping”. The main aim is to build a safe, low-energy passenger ship with a highly efficient, emission-free propulsion system. This can be achieved in a variety of ways. The article presents the main problems encountered by designers and constructors already at the stage of designing the unit. The research conducted made it possible to create a design with an effective shape of the hull, with the prospect of an energy-efficient and safe propulsion system with good manoeuvrability. The scope of the research included towing tank tests, recalculation of the results in full-scale objects and a prediction of the energy demand of the propulsion system. The results obtained were compared to indicate power supply variants depending on the hull shape.