A hydrodynamic optimization design methodology for a ship bulbous bow under multiple operating conditions

Abstract

The main objective of this article is to describe an innovative methodology for the hydrodynamic optimization of a ship bulbous bow which considers multiple operating conditions. The proposed method is more practical and effective than the traditional optimization process, which is only based on contractually specified design condition. Parametric form approaches are adopted by employing an F-spline curve in order to generate variants of the hull bulbous bow forms using form design parameters modified, resulting in an optimization system based on improved genetic algorithms. The Rankine source panel method is used for the hydrodynamic evaluation, wherein non-linear free surface conditions and the trim and sinkage of the ship are taken into consideration. The validity and effectiveness of the proposed methodology for a large container ship is investigated by comparing the computational results with experimental data, which demonstrates that the proposed methodology can engage well in the automation process and improve hydrodynamic performance during actual ship design practices. ARTICLE HISTORY

Decarbonization in Shipping Industry: A Review of Research, Technology Development, and Innovation Proposals

“…Hydrodynamic optimization is an effective and robust design method that has a key role in the optimization of hulls [173]. Reduction of hull resistance can be achieved via vessel design, such as optimum hull dimensions, reduced ballast operation, lightweight construction, low profile hull openings, interceptor trim plates, skeg shape-trailing edge and bulbous bow.…”

Hydrodynamic Design Study on Ship Bow and Stern Hull Form Synchronous Optimization Covering Whole Speeds Range

“…The Rankine sources method is based on the potential-flow without considering viscosity. Nevertheless, for a sophisticated shiphull optimization system, it is more simple and convenient and has been proved to be accurate, reliable, and efficient, so it has been investigated in various studies (Abt and Harries et al [23], Lu, Chang, and Hu [24], Lowe and Steel [25], Suzuki, Kai, and Kashiwabara [26], Zhang, Kun, and Ji [27], Zhang [28], Chi, Huang, and Noblesse [29], Choi, Park, and Choi [30], and Chi, Huang, and Kim [31]).…”

Achieving Drag Reduction with Hullform Improvement in Different Optimizing Methods

“…The hydrodynamic performance of the ship can be enhanced by reducing friction and pressure resistance. Several recent techniques have been carried out to achieve reduced drag on ships, i.e., improvements to the hull structure (Ibrahim et al, 2018), micro bubble injection (Sindagi et al, 2018;Zhang et al, 2019), and optimization techniques (Park et al, 2015;Samuel et al, 2015;Choi 2015;Lu et al, 2016;Lu et al, 2019). The hull's geometric optimization is considered a relatively reliable and appropriate method of evaluating ship hydrodynamics.…”