As the core equipment for deep-sea aquaculture, the hydrodynamic research on ship-shaped aquaculture cages is crucial for ensuring their structural safety and farming reliability under extreme sea conditions. This paper systematically integrates the framework of "theoretical research-numerical simulation-model validation" used in the hydrodynamic study of ship-shaped aquaculture cages and reviews the relevant hydrodynamic analysis theories. The research status is reviewed from three aspects: hydrodynamic responses of the hull and mooring system, hull structural strength, and fluid-structure interaction effects of the netting. Furthermore, the key challenges in the hydrodynamic analysis of ship-shaped cages are analyzed: the complexity of multi-physics strong-coupling modeling, the accuracy-efficiency trade-offs in netting simulation, the bottlenecks in predicting nonlinear responses under extreme environments, and the lack of full-scale validation data. Finally, four future research directions are proposed: developing a multi-field wave-structure-mooring-netting interaction model, advancing the refined modeling technology for complex marine environments such as typhoons and internal waves, introducing intelligent algorithms to optimize the dynamic response of mooring systems, and developing hydrodynamic optimization and control technologies for intelligent submersible systems. This review provides theoretical support for the hydrodynamic mechanism research and engineering safety application of ship-shaped aquaculture cages.

Bulk cement transfer system is important system of drilling platform to mainly transfer bulk cement to the cementing units. The double bulk cement transfer system has in response to the further improve ment of the transferring and mixing efficiency, and ensure the cementing quality and the safety of the system redundancy. The design principle, arrangement and application of the double bulk cement transfer system are elaborated for jack-up drilling platform. It can provide reference for the design and construction of the bulk cement transfer system of the other drilling platforms.