This thesis presents a comparative analysis of total ship resistance between two hull variants. The research examines the influence of bulbous bow shape on the vessel’s hydrodynamic characteristics, with resistance determined using Computational Fluid Dynamics (CFD) methods. The model geometry is based on an Evergreen A-class vessel, characterised by a vertical stem and a specific underwater bulbous bow. Two versions, differing only in bulb geometry, were compared:
• the SLIM variant, representing a thinner and more slender form,
• the FAT variant, featuring a wider and fuller geometry.
The three-dimensional hull model was developed using the Rhinoceros (Rhino) software package. For the numerical simulation, a suitable computational mesh was generated using the snappyHexMesh utility, while the primary calculations were performed within the OpenFOAM open-source environment. Total resistance calculations were conducted on a model with a length of 10 metres, and the resulting data were subsequently scaled to the full-scale vessel length of 250 metres. The simulations were carried out at a design speed of 20 knots, corresponding to the standard service speed typically specified by the shipowner. The objective of the study was to determine which geometric variant offers lower resistance, thereby enhancing the energy efficiency of the vessel at the designated speed.
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