Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering Conference
Shanghai, China, June 5–10, 2022
Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE)
ISBN 978-1-880653-81-4; ISSN 1098-6189

www.isope.org

Research on Hull Form Optimization of KCS Ship Based on NM Theory
Baiwei Fenga,b, Hui Zhoua,b, Chao Maa,baKey Laboratory of High Performance Ship Technology, Wuhan University of Technology, Ministry of Education

Wuhan, Hubei, ChinabSchool of Naval Architecture, Ocean and Energy Power Engineering, Wuhan University of Technology

Wuhan, Hubei, China

Kim (2009) modified Wigley hull profile based on parametric hull
representations and NURBS surfaces and Peri et al. (2001) utilized Bézier Patch to complete the modification of hull geometry. Based on theRankine source method, Zhang and Percival et al. (2012) obtained an
optimized ship hull form with minimum wave-making resistance. WanDecheng et al. (2020) carried out local deformation of bow, waterline
and aft of luxury cruise ship by the FFD (Free-Form Deformation)
method, combining with the Neumann-Michell (NM) potential-flowbased solver NMShip-SJTU to complete the optimization of wavemaking resistance at the two specified speeds. Shen Tong et al. (2013;2015) used the radial basis function interpolation method and combinedwith the hydrodynamic solver Shipflow to optimize the wave-making
resistance of KCS and S60 ships, and obtained the ship type with better
resistance performance, but the displacement of the optimized ships
was reduced, which reduced the ship operation economy to some extent.
Hu Chunping et al. (2012) completed the full parametric modeling ofKCS by using parametric modeling software CAESES, and combinedwith hydrodynamic calculation software to complete the study ofautomatic optimization of KCS profile. Zhan et al. (2012) used a fusion
deformation method to generate a series of bulbous bows, realized theautomatic optimization of the bulbous bow profile, and got the ship
type with less wave-making resistance.

ABSTRACTTo meet the requirements for green ships in the IMO ship Energy
Efficiency Design Index, based on the self-developed ship form
optimization platform (SHIPMDO-WUT), the KCS ship is regarded as
the initial hull to reduce its wave-making resistance at a certain speed.
The hull form modification is then implemented by the radial basis
function (RBF) interpolation technology and the resistance evaluation
is carried out by the NM (Neumann-Michell) potential flow theory
solver to minimize the wave-making resistance combining with theNSGA-II algorithm. Finally, after completing the optimization of ship
resistance performance at the speed of Fr=0.3, the optimized ship isselected for analysis, and the resistance reduction effect of the
optimized ship is analyzed through STARCCM+ software.
The research results show that: (1) The hull form modification module
based on radial basis interpolation technology can produce a smooth
hull profile; (2) For the KCS ship, under the premise of meeting theengineering constraints, the automatic optimization method of the hull
surface based on numerical simulation can obtain a new ship form with
better performance of resistance.

KEY WORDS:KCS ship; NSGA-II algorithm; radial basis
function interpolation; NM potential flow theory; wave-making
resistance; optimization of ship hull form.
INTRODUCTION
Ship hull form optimization is one of the effective methods to achieveenergy saving and emission reduction. With the development ofcomputer technology and Computational Fluid Dynamics (CFD), its
evaluation capability has been enhanced, simulation-based design(SBD) has been listed as a hot issue in the research of numericalsimulation technology by the International Tugboat Conference (ITTC),and many scholars at home and abroad have conducted extensive
research on ship hull form optimization.

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Up to now, scholars at home and abroad have continued to research on
the optimization of ship hull form and have made some progress. In
this paper, based on the Ship Multidisciplinary Design andOptimization software (SHIPMDO-WUT) independently developed byWuhan University of Technology research team, we will complete theoptimization of the wave-making resistance under the speed Fr=0.3
with the KCS ship as the mother ship, and combine the Non-dominatedSorting Genetic Algorithm (NSGA-II). The optimized ship schemewith better performance of wave-making resistance is obtained, andfinally the total resistance is further verified by STARCCM+. This
paper is divided into three parts: the first part briefly introduces theRadial Basis Function (RBF) interpolation method and NeumannMichell (NM) potential flow theory; the second part introduces the