Ships and Offshore Structures ( IF 2.1 ) Pub Date : 2020-02-17 , DOI: 10.1080/17445302.2020.1727180 Giuliano Vernengo 1 , Diego Villa 1 , Dario Bruzzone 1 , Luca Bonfiglio 2
ABSTRACT
The study focuses on the analysis of the added resistance of a catamaran advancing both in regular waves and in a seaway. The numerical simulation has been carried out within the framework of potential flow theory by using a three dimensional, linear, Rankine source-based Boundary Element Method (BEM) and a Near-Field approach based on pressure integration for the first-order motions and the second-order longitudinal force prediction, respectively. A preliminary validation and verification study on both a mono-hull and a catamaran is proposed. A systematic analysis of the effect of some relevant operating and geometric parameters on the added resistance performance of a catamaran in waves is presented. Variations of the operating and geometric parameters include the advancing speed, the encounter angles from head to beam waves, the hull static trim and the demi-hulls separation. The trends of the added resistance pseudo-RAO are discussed in the light of the comparison against the reference design condition highlighting possible worse and optimal configurations.
中文翻译:
考虑工作参数和几何参数变化的双体船在波浪中前进所产生的附加阻力的研究
摘要
这项研究的重点是对双体船在规则波浪和航道中前进所产生的附加阻力进行分析。数值模拟是在势流理论的框架内使用三维线性,基于兰金因源的边界元方法(BEM)和基于压力积分的一阶运动和运动的近场方法进行的二阶纵向力预测。提出了对单体船和双体船的初步验证和验证研究。提出了一些相关的操作和几何参数对双体船在波浪中增加的阻力性能的影响的系统分析。操作参数和几何参数的变化包括前进速度,从头波到束波的相遇角,船体静态纵倾和半船体分离。根据与参考设计条件的比较,讨论了增加的电阻伪RAO的趋势,突出了可能的更差和最佳配置。