This study investigates the hydrodynamic response of polar transport ships under ice-propeller-rudder multi-body interactions in brash ice channels. The study develops a numerical ice tank and a discrete element model for brash ice using a coupled Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) integrated with overset grid technology. The research analyzes the self-propulsion characteristics of ships navigating in brash ice channels. The reliability of the Discrete Element Method (DEM) is validated through quantitative comparisons between numerical results and experimental data for ice-induced resistance. The analysis examines the influence of propeller rotational speed on the hydrodynamic performance of the propeller-rudder system under different loading conditions, considering both ice-free and ice-covered environments. Results indicate that the propeller rotational speed required to achieve the self-propulsion point at scantling draft condition is higher than that required at design draft condition. Furthermore, the study compares the force characteristics of the propeller-rudder system in both time and frequency domains, contrasting environments with and without brash ice. These findings provide valuable insights for predicting ice loads and ensuring navigational safety of ships in ice-covered waters.

The deep-sea green intelligent technology test vessel “WEI LAI” is designed primarily for tasks including the pilot testing of green intelligent technologies, surface support for deep-sea equipment, and comprehensive marine scientific surveys. It features a rational overall layout, strong retrofitting and reconfiguration capability, flexible equipment integration, excellent maneuverability, a high degree of intelligence, and powerful testing capabilities. It serves as a crucial cornerstone for supporting the intelligent upgrading and green development of key systems and equipment and for promoting the transformation and industrialization of scientific and technological achievements. This paper briefly describes the functional orientation of the "WEI LAI" vessel and analyzes its design requirements from the aspects of functional diversification, whole-vessel modularization, and system intelligence. It then presents the overall schemes for the ship type and general arrangement, modular retrofitting design, and key systems, including the power redundancy and hybrid propulsion system, intelligent information system, integrated platform for intelligent and dynamic testing, power system sea trial verification platform, dynamic testing system, and test collaborative control system. This paper can provide references for the development of special test vessels for marine equipment.