FATIMA calculation results


duced added resistance. An illustration of the calculation results is given in Figure 1.


Following the calculations, model tests were carried out in the Seakeeping and Manoeuvring Basin. The basin is 170 m long, 40 m wide and 5 m deep. The model tests were per- formed using a free-sailing, self-propelled scaled model of the container vessel. An impression of the model tests is given in Figure 2. It is worth noting that the only connections between the model and the carriage consisted of free-hanging wires for measurement and power relay. These did not restrict the model motions in any way.


Roll behaviour The first series of tests was dedicated to an extended characterisation of the rolling behaviour of the vessel in the most unfavourable wave conditions. Given the relatively long natural roll periods associated with most of the installed loading conditions in comparison with the range of wave periods, the most unfavourable wave conditions with respect to roll were observed in long waves originating from the stern quarter. The test series also included specific tests to assess the risk of parametric roll. Besides the roll motion, attention was given to the transverse and vertical accelerations generated by the ship motions (mainly roll) at the bridge or on the container lashing system.


The second test series provided a detailed assessment of the vessel’s operational performance for several sailing scenarios.


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The investigation encompassed the quanti- fication of ship motions and associated accelerations, the risk of green water at the bow, slamming at the bow-flare and stern and added resistance due to wind and waves. During the tests a wide array of wave conditions was considered, ranging from normal storm conditions to hurricane-like conditions. The resulting estimates of the risk of green water at the bow and slamming allowed MARIN to validate certain design choices, such as the breakwater or bow-flare angle. Additionally, the measurements of


the thrust and torque delivered by the propeller yielded a good estimate of the wave- induced added resistance and associated speed loss.


It is also worth mentioning that this project thrust MARIN into the spotlight when rather unusually, Maersk Line requested that a film crew were present during the tests. This fascinating documentary, “Maersk Line’s Triple-E – the World’s Largest Ship”, is currently on air on the Discovery Channel and is definitely worth a look!


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