How to estimate the added resistance and speed loss of full type ships in seaway?!

What is it about?

This paper presents results of a systematic study on the resistance and speed loss of full type ships in waves. The percentage resistance-increase in waves against experimentally measured calm water resistance data was estimated by use of two alternative empirical formulas, namely one proposed by the authors (Liu and Papanikolaou, 2017) and the other one proposed by MARIN(Grin, 2012) and recommended by ITTC (2014b). The obtained results clearly show that the percentage resistance-increase and the associated (involuntary) speed loos are strongly dependent on ship’s absolute size, loading condition and the operating seaway conditions and they can be satisfactorily quantified. This should be taken into account in the ship design process, when determining the sea margin for the selection of the machinery and propulsion system, when analyzing sea trails and/or when preparing scaled model experiments to assess ship’s performance in realistic seaway scenarios

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Why is it important?

For assessing the performance (fuel consumption) in realistic sea conditions, it is important to estimate the effect of weather conditions, namely of wind and waves. The presented method enables this by use of a semi-empirical formula.

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