Work Packages

Work Packages

Work Packages and their Interdependencies

Workpackages

Work Package 1

The objective of this work package is to provide met-ocean description for the project, to define ship sizes for ship types considered by the project, to conduct a risk analysis of relevant marine  accidents related to manoeuvring in adverse weather conditions and to propose safety criteria to be addressed by the project based on a critical review of the current EEDI as well as operational experience from ship operators and other project partners.

Classifications societies, research organizations, ship operators and ports will contribute to this WP. In particular, participating operators and ports will provide actual ship and port operational data for setting up realistic benchmark scenarios for subsequent work packages. WP 1 will interact closely with WP2 and WP3, which will provide feedback to WP 1 for necessary updates of met-ocean conditions and/or required ship characteristics. It will also closely support WP6 with relevant ship and operational data for the definition of the case studies.

Work Package 2

The objective of this work package is to perform further development and refinement of various numerical hydrodynamic tools available to the participants. The enhanced models will be used to analyse the experimental results produced in WP3 and assess the suitability of methods and tools in WP 4. It is expected to significantly improve the current state of the art in the scientific field of manoeuvring in adverse weather conditions by improving the capabilities of a series of numerical methods and computer codes differing with respect to the governing first principles (potential theory and field RANSE methods), computational speed, complexity and accuracy; also, some of the employed methods are of universal nature, whereas others focusing on specific situations such as loss of stability in waves, manoeuvring in waves, aerodynamic loads, and hydrodynamic interaction in confined waters.

Work Package 3

The objective of this work package is to collect high quality experimental data for validation of the tools and methodology developed in WP 2. The data are input to the validation studies in WP 4. Performing seakeeping/manoeuvring model tests in combined seaway/wind environment by use of a series of prototypes of different ship types to provide the required basis for the validation of employed software tool and the results obtained by numerical simulations. Though the final reports of the experimental activities will be issued in M24, early results as necessary for first validation studies will be available in M12. It should be noted that the project consortium will also dispose for validation purposes full scale data available to the participating ship operators, namely records speed-powering and fuel consumption data in dependence on loading and environmental conditions, ship motions and accelerations.

Work Package 4

This main aim of this WP is the validation of numerical simulation tools developed in WP2 using model test data from WP3. The separation of development and validation of numerical tools in two work packages ensures uniform and coherent validation of the various numerical tools and, in addition, ensures the most efficient use of the various measurement data from WP3. Moreover, selected test cases will be used in an open benchmarking with external participants to evaluate the available state-of-the-art of numerical methods for the proposal of new regulations. Experience shows that simple models of propulsion, steering devices and engine dynamics are not available for the implementation in the numerical simulation tools. Therefore, the next aim of this WP is to develop such models, using direct numerical simulations of propulsion and steering devices, as well as the available knowledge about engine dynamics.

The developed numerical tools in WP2, when sufficiently validated, could be used as a replacement to model tests for direct assessment in regulatory procedures. However, as experience shows, majority of ship designs can be assessed with simplified assessment methods (referred to as Level 1 methods), which should include however large safety margins to compensate for the simplifications made. Development of such Level 1 methods for the assessment of ship manoeuvrability in adverse conditions is the next aim of this WP.

Finally, addressing intact stability problems, required by the call, can be done with the available state-of-the-art numerical tools for intact stability assessment. However, the requirements of intact stability have been so far never considered in a coupled way with other safety aspects of ship sailing in adverse weather conditions. For example, safe combinations of ship course and speed with respect to dynamic stability in waves may be not achievable from the point of view of achievable advance speed or course-keeping. On the other hand, reduction of installed power and thus deterioration of manoeuvrability in adverse conditions will increase the likelihood of unfavourable courses and speeds and thus the danger of undesirable ship motions and stability failures. Investigation of this coupling is the last aim of this WP.

The particular objectives of this WP are:

– To develop test matrix and requirements to format of the results of model tests

– To validate numerical tools against the model tests and CFD simulations

– To conduct open blind benchmarking of numerical simulation methods for selected cases, including external participants

– To compare the performance of different steering devices and to develop simple models of steering devices to be used by ship motion simulation tools

– To develop simplified models for engine dynamics for their implementation in the ship motion simulation tools

– To establish Level 1 assessment methods to be used in regulations and in ship design optimisation at early design

– To provide recommendations for ship design and operation, as well as for regulations, to ensure ship safety with respect to both manoeuvrability and dynamic stability in adverse conditions

Work Package 5

To integrate validated software tools for the hydrodynamic/manoeuvrability assessment of ships  in adverse seaway/weather conditions into a ship design software platform and set-up of multi-objective  optimization procedures in which ship’s performance is assessed holistically, thus,  looking for the minimum powering requirement to ensure safe  ship operation in adverse seaway/weather conditions, while keeping the right balance between ship economy, efficiency and safety  of the ship and the marine/air environment.

Planned optimization studies shall be implemented in two phases:

• Global optimization, aiming to identify most favourable combinations of main dimensions, form parameters and other integrated characteristics of the ship, including powering and manoeuvring devices, for the selected operational profile. These studies should be carried out for all ship types and sizes while considering applying as far as possible simplified, semi-empirical models (level 1 methods) developed in previous work packages of the project.

• Detailed optimization, including hullform details.  These studies should be carried out for selected ship types and sizes based on the outcome of the previous phase, applying as far as possible medium accuracy models (level 2 methods) developed in previous work packages of the project.  Heavy-refined models (level 3, CFD type methods) could also be applied if necessary, but their use will be kept at minimum as possible.

This work package receives input from WP2 and WP4 (level 1 assessment methods) and WP1 (ship and operational data), while it provides feedback to WP6 (set-up of case studies).

Work Package 6

To conduct investigations on the impact of the proposed new guidelines for the assessment of the minimum propulsion power to maintain  manoeuvrability in adverse conditions (MEPC 64/4/13)  on the design and operational characteristics of various  ship types,  by implementation of the developed integrated/holistic optimisation  procedure in a series of case studies. To assess in addition ship types currently not covered by the EEDI provisions, like tugs and Offshore Support Vessels. To assess and analyse the results of all work packages, leading  to the development of new guidelines for the required minimum propulsion  power and steering performance to maintain  manoeuvrability in adverse conditions. To establish minimum propulsion power/ steering performance and likely new EEDI requirements ensuring safe operation for various types of ships.

These will be achieved by putting together teams that comprise designers, classification societies, yards and universities, while operators and ports will provide expertise and data.  Simplified Level 1 methods will be used to enable time-efficient studies to be carried out.

This work package receives input from WP1 (ship and environmental data, EEDI and safety  criteria), WP2 (level 2 and level assessment methods), WP4 (level 1 assessment methods), WP5 (set of Pareto front ship designs), while it provides feedback to WP7 (preparation of IMO submission).

Work Package 7

The objectives of this work package are to (1) disseminate the results of the project to the public in the form of publications and public workshops and (2) provide for exploitation  of the results through  submission to IMO of updated guidelines for minimum required power and steering performance to maintain  manoeuvrability under adverse conditions, while (3) develop exploitation  plan for the exploitation  of the resulting  knowledge, numerical tools, software and design methods.

Wide dissemination of the project results is facilitated through several public workshops and publications. Dissemination work will bring together all participating classification societies (GL, DNV, LR and RINA), in order to attract the attention of the key payers in the industry, IMO and IACS to the results of the project, as well as academia (IST, UDE), to ensure wide spread of the obtained results, under the leadership of project coordinator NTUA to ensure that all required inputs from the whole project are available in this task.  The knowledge, numerical tools, software and design methods, developed in the project,  will be required in the industry when applying the updated guidelines, therefore, exploitation  of these results is to be ensured through the participation of ship yards  (DAN, FSG),  classification societies (GL, DNV, LR and RINA) and academia (NTUA) in the development of the exploitation  plan. The development of the exploitation plan will also be facilitated through the Exploitation Committee. To exploit the results of the project through  the update of IMO regulations, all participating classification societies and project coordinator NTUA under  the leadership of GL will prepare updated guidelines for minimum required power and steering performance to maintain  manoeuvrability under  adverse conditions.

Work Package 8

To perform the administrative management of the project.