Numerical Analysis Of Continuous Ice Breaking Of High Ice Class Icebreaker

At the present time,the pace of global warming has not stopped.Massive melting of glaciers in the North and South poles has affected the global ecological environment.But at the same time,it has also broadened the way for exploration of polar regions.Governments of all countries have issued corresponding polar regions strategies to step up the development and exploration of polar regions.Whether it is polar navigation,scientific investigation or resource development,all need to rely on icebreakers.Therefore,it is of great practical significance to accurately simulate the continuous ice-breaking process of the icebreaker and accurately predict the ice resistance for the design optimization of the icebreaker.The main work of this paper has the following points:1.The formation,microstructure,physical and mechanical properties of sea ice are summarized.By comparing the simulation results with the P-A curve of ice material recommended in ISO/CD19906,the applicability of the ice material numerical model is validated.2.The FEM-SPH adaptive coupling method is introduced,and the nonlinear finite element software LS-DYNA is used to simulate the continuous icebreaking process of the icebreaker.This method can make up for the problem of nonconservation of mass and energy caused by the traditional finite element method using element deletion.It also can simulate the phenomenon of icebreaking when the ice sheet is broken.The applicability and accuracy of the method are validated by comparing the ice resistance results obtained from the simulation and the Lindqvist formula.3.Based on the measured data of the Antarctic Weddell ice ridge,the origin and geometric characteristics of the ice ridge are analyzed,and two types of ice ridges are selected to establish a finite element numerical model.The nonlinear finite element method is used to simulate the icebreaker in ice ridge conditions.The whole process can be divided into three stages,and the differences between ice ridge conditions and level ice conditions are summarizes.4.By selecting three kinds of collision angles,the impact of collision angles in the ice ridge conditions is studied.The results of ice resistance obtained by numerical simulation are compared to analyze the better navigation mode in ice ridge conditions.