Full scale wake prediction of an energy saving device by using computational fluid dynamics

•A reliable and efficient propulsive performance prediction method for full scale ships with ESD's is proposed.•The proposed method extends the model scale results to full scale ones with ESD's effects.•The proposed method takes less computational resources and time than full scale computations.

Recently interest on energy saving devices (ESD׳s) has increased with the enforcement of the energy efficiency design index (EEDI) verification proposed by the International Maritime Organization (IMO). Extension of propulsive performance results from model to full scale ships plays an important role in verification of ships with ESD׳s. The present study proposed a reliable and efficient propulsive performance prediction method for full scale ships with ESD׳s. The propulsive performance prediction in full scale KVLCC2 with pre-swirl stator (PSS) was conducted by the proposed method. Its results were then compared with those by the existing extension methods and by full scale CFD computations. From the results, it was confirmed that the proposed method could extend the model scale results to full scale ones with ESD׳s performance improvement effects. Unlike the existing methods, it takes into account of ESD׳s and consumes much less computational resources and time than full scale CFD computations.