ITTC - General Committees - Tasks: Seakeeping

Note: The Seakeeping Committee is primarily concerned with the behaviour of ships underway in waves. The Ocean Engineering Committee covers moored and dynamically positioned ships and the modelling and simulation of waves, wind and current.

1. Update the state-of-the-art for predicting the behaviour of ships in waves including high speed and unconventional vessels, emphasizing developments since the 2005 ITTC Conference,

Comment on the potential impact of new developments on the ITTC.
Emphasize new experimental techniques and extrapolation methods and the practical applications of computational methods to seakeeping prediction and scaling.
Identify the need for R&D for improving methods of model experiments, numerical modelling and full-scale measurements.

2. Update the procedure for experiments on rarely occurring events, 7.5-02-07-02.3, with separate sections for: water on deck, slamming, propeller emergence and aft body slamming. Liaise with the Ocean Engineering Committee.

3. Update the procedure 7.5-02-07-02.1 for model tests on linear and weakly non-linear seakeeping phenomena. Include information on how long the runs in irregular waves should be, compared to the way (repeat time, method, etc) the irregular waves are generated. Liaise with the Ocean Engineering Committee.

4. Rewrite the procedure 7.5-02-07-02.2 for added resistance and power increase in irregular waves. Liaise with the Powering Performance Committee.

5. Update the procedure 7.5-02-07-02.4 for the validation of codes in the frequency domain so that it is independent of the method used. The information dealing with the pitfalls of making the code should be put in an appendix, concentrating on the main parameters important for validation, with acceptance criteria if possible. Ensure that the procedure is consistent with the one being developed by the Ocean Engineering Committee. The work should be carried out in co-operation with the Ocean Engineering Committee, and should essentially be based upon the review and update of earlier work by the 24th ITTC Seakeeping and Ocean Engineering Committees.

6. Develop a procedure for the validation of codes in the time domain so that it is independent of the method used, and the part dealing with the pitfalls of making the code should be put in an appendix. The procedure should concentrate on the main parameters important for validation, with acceptance criteria if possible. Ensure that the procedure is consistent with the one being developed by the Ocean Engineering Committee.

7. Support the Specialist Committee on Uncertainty Analysis in reviewing the procedures handling uncertainty analysis.

8. Critically review examples of validation of prediction techniques. Identify and specify requirements for new benchmark data.

9. Determine requirements for benchmark tests for seakeeping in oblique waves such that these benchmark tests could be conducted in the future. Pay special attention to the control system used in the test. Investigate whether any non-proprietary data exists, and can be made available for seakeeping of high-speed craft in oblique seas, that can be used for benchmarking in the future.