Study on the influence mechanism and numerical simulation of hull geometric characteristics on ship sinkage and resistance performance

Ship sinkage and resistance during navigation—key hydrodynamic characteristics impacting safety and efficiency—are closely linked to hull geometry. Using experimental and numerical data from 12 ship types, this study explores how hull geometric parameters influence these traits. Towing tests and CFD simulations (for flow pressure and dynamic sinkage) verified a strong correlation between slenderness ratio and sinkage, enabling a slenderness-based sinkage prediction model. Findings show: increased slenderness significantly reduces sinkage; the waterplane coefficient more strongly affects slender hulls; sinkage increases raise resistance, especially in shallow/restricted waters. This provides theoretical and numerical references for hull optimization and resistance reduction.