Development of enhanced empirical-asymptotic approach for added resistance of ships in waves

• Published in: Ocean engineering 2023-07, Vol.280, p.114762, Article 114762
• Main Authors: Lee, Jaehak, Kim, Yonghwan
• Format: Article
• Language: English
• Subjects: Added resistance; EEDI; Enhanced asymptotic formula; Sea trial; SNNM formula; SNU formula
• ISSN: 0029-8018; 1873-5258
• DOI: 10.1016/j.oceaneng.2023.114762

This study aims to develop a practical and accurate prediction method for the added resistance of ships in regular wave conditions. To this end, the SNU formula proposed by Yang et al. (2018a) is enhanced for the diffraction-induced added resistance of ships in short waves with arbitrary wave headings. Notably, the SNU formula is simplified without loss of accuracy for its application in practical problems. Radiation-induced added resistance in long waves is predicted using the SNNM formula proposed by Liu and Papanikolaou (2016, 2020), and Wang et al. (2021). The two formulas are combined with a proper blending function. To validate the developed method, various tank-test data of existing ship models are collected, and a systematic comparative study including statistical analysis is performed. In particular, the accuracy of the developed numerical method is discussed considering the effects of ship speed and wave heading angle. Based on the present study, the reliability and fidelity of the proposed enhanced method are expressed by considering a variety of physics of added resistance. •This paper introduces an asymptotic formula for added resistance in short waves.•The proposed formula is simplified from the original SNU formula for more flexibility of application.•The developed formula is validated by comparing 900 data of added resistance data measured from eight ship models.•The correspondence with experimental data is the best when the SNU formula is combined with SNNM formula.•The present method can be useful for practical prediction of added resistance.