Hydrodynamic optimisation of a multi-purpose wind offshore supply vessel. Issue 2 (3rd May 2020)

• Record Type: Journal Article
• Authors: Feng, Yanxin; Moctar, Ould el; Schellin, Thomas E.
• Is Part Of: Ship technology research. Volume 67:Issue 2(2020)
• Page Start: 69
• Page End: 83
• Publication Date: 2020-05-03
• Subjects: Parametric modelling -- hull form optimisation -- total resistance -- boundary element method -- RANS solver; Shipbuilding -- Periodicals; 623.82072
• DOI: 10.1080/09377255.2019.1602976
• Languages: English
• ISSNs: 0937-7255

Abstract

ABSTRACT: The aim of this study was to reduce the total resistance of a multi-purpose wind offshore supply vessel by optimising its hull. Resistance was computed using a potential flow boundary element method and a Reynolds-averaged Navier–Stokes equations solver. Optimised hull forms were obtained for the ship advancing at different ship speeds under calm water conditions, employing the two multi-objective optimisation algorithms, Non-dominated Sorting Genetic Algorithm II (NSGA-II) and Multi-Objective Simulated Annealing (MOSA). Using NSGA-II yielded slightly larger reductions of total resistances than MOSA. The greatest reductions were achieved at ship speeds between 11 and 14knots. At these speeds, a thinner and longer bulbous bow reduced resistance. At speeds greater than 15knots, a bloated bulbous bow was more helpful to reduce resistance.