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Pohang Institute of Science and Technology, Korea

This paper shows a definite improvement in predicting the motion and wave loads of ships. I would like to congratulate the authors for the excellent work presented here

My long-held assertion is that the validity of the methods in predicting ship motion in waves should be proved by checking the relative vertical motion of a ship with respect to waves, rather than checking the absolute motion alone with the corresponding experimental results. I would like to know how good the present theory is in this regard.


You are correct in that any method should be validated against as many experimental results as possible. However, due to the difficulty in obtaining relative wave elevations from experiments, few of these results can be found in the open literature. We have compared our relative wave elevation predictions to one set of experiments for the commercial design, TGC's FASTSHIP, and found a favorable comparison.

Also, for the purposes of global load predictions presented in this paper, the quantity of relative wave elevation is not directly relevant, since we have not examined slamming. When this quantity is evaluated there is also a question of physical significance. Exactly at the intersection of the wave and ship, the wave profile is difficult to measure due to localized effects such as jet formation and spray. In these loads, the relative wave elevation may be measured at some small distance away from this exact line of intersection. In this case a potential based method will perform well.

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