Numerical Investigation on the Added Resistance and Seakeeping Performance of KVLCC2 with the SWENSE Method

Abstract

In this study, the added resistance and seakeeping performance of the KVLCC2 ship is investigated by using the spectral wave explicit Navier–Stokes equations (SWENSE) method. The SWENSE method is based on the decomposition of the total field into an incident part explicitly obtained by the wave potential flow theory and a complementary part solved with a modified Reynolds-averaged Navier–Stokes solver. Therefore, the computational efficiency can be achieved by using a relatively coarse mesh in the far field, retaining the accuracy of the incident waves. A parametric study is performed under regular wave conditions with 3Degree of Freedom (DOF) motions of the hull. The results are compared with the large literature available. An additional case is simulated to demonstrate the capability of the present method in simulating seakeeping problems in irregular sea states. Good agreement between the computed results with the reference data can be observed for the hull model, which indicates that the added resistance and seakeeping performances can be well predicted by the present method. Introduction In recent years, the Energy Efficiency Design Index (EEDI) has been introduced by the International Maritime Organization to restrict greenhouse gas emissions from ships. In the EEDI formula, the evaluation of the added resistance is required and defined as the increased resistance in the actual sea state due to waves, winds, etc. compared with the resistance in the calm sea condition. The resistance in actual sea states could be up to 30% greater than that in the calm water resistance (Lee et al. 2017). Therefore, prediction of the added resistance induced by waves is an important subject for ship design and is the focus of the present study.