Improvement of the hydrodynamic performances of planing craft in waves using flat-chines

• Published in: Ocean engineering 2023-05, Vol.276, p.114190, Article 114190
• Main Authors: Zeraatgar, Hamid, Bozorgmehr, Arash, Hasheminasab, Hassan, Eskandari, Mahan
• Format: Article
• Language: English
• Subjects: Acceleration; Flat-chine; Hard-chine; Planing craft; Regular waves; Resistance
• ISSN: 0029-8018; 1873-5258
• DOI: 10.1016/j.oceaneng.2023.114190

This study investigates effects of the flat-chine on hydrodynamic performances of a planing hull both in calm water and waves. A prismatic hard-chine hull as a reference hull and three hulls fitted with flat-chine are selected for analysis and comparison. Initially, a set of model experiments are conducted on the reference hull for evaluation of the numerical method. Then, the numerical simulation is extensively employed using SIEMENS PLM STARCCM + to analyze effects of chine breadth ratio, defined as b-to-B ratio, on planing craft's performances. This study shows that the vertical acceleration in waves significantly reduces, 15% or more, by fitting the flat-chine to a hard-chine hull. It is also concluded that a larger b-to-B ratio triggers the lower acceleration. However, increasing b-to-B ratio results in a marginal increase of drag in the calm water, about 1%. Considering both advantages and disadvantages of the flat-chine, fitting appropriate flat-chine to planing hulls is justified. •Flat-chine is a kind of appendages which is widely utilized in planing hulls.•The resistance in the calm water and performances in waves are two important hydrodynamic performances of planing craft.•The flat-chine significantly improves acceleration in waves.•The flat-chine marginally increases planing craft resistance.•Larger breadth of the flat-chine has higher effects in comparison with smaller breadth.