Influence of ice floe size on ice resistance of ship hull in broken ice field based on discrete element analysis
The ice resistance affects the safety and navigation performance of a ship when sailing in a broken ice field.In this paper,icebreaker Xuelong is taken as the research object.The three-dimensional discrete element method(DEM)is used to numerically simulate the ice resistance of ship structures in a broken ice field.Based on a random generation algorithm,the irregularly shaped area of broken ice is modeled to form a complex initial broken ice field.Considering the force of seawater on the hull structure,the calculation model of the broken ice resistance of the hull is established.And the DEM results are compared well with the DuBrovin equation for ice resistance in a broken ice field.Based on the DEM simulated results,and the influence of ice size on broken ice under different ice thickness and speed is studied.Based on the Lindqvist formula of hull ice resistance in a flat ice region,the critical scale of the transformation from broken ice to layered ice is obtained.The critical size of floe can be used as a criterion to identify the broken ice area and level ice.This work can provide a certain reference for the safe navigation of ships in the polar ice regions.
icebreakerdiscrete element methodbroken ice fieldice floe sizeice resistance
万方数据
维普
