Research On Bow Configuration Of Ships Sailing In Ice Area

With the global climate change,the sea ice in polar regions is gradually decreasing,and the development of resources and navigation channels in the Arctic region is increasingly becoming a research hotspot.The Arctic region is the shortest route connecting northern Europe,North America,and Asia,and the demand for transport ships sailing in polar ice regions will become increasingly strong.Commercial transport ships need to have a certain degree of self breaking ice ability to navigate the Arctic waterway smoothly,but commercial transport ships still navigate in open water for most of the time,and it is crucial to consider the resistance impact of this type of ship in open water.For ships in ice zones,the bow shape is crucial for their ice breaking ability and open water effect.This article presents the bow design of a container ship with IA Super(PC6)class ice zone navigation requirements.The circumferential crack method is used to calculate the ice load on the ship,and the computational fluid dynamics method is used to predict the hull resistance.This design aims to balance the good navigation performance of ships in both ice breaking and open water conditions.The main tasks of the thesis include the following aspects:(1)Referring to the bow configuration schemes of polar transport ships at home and abroad,by changing the inclination angle of the bow column from 20 degrees to 26 degrees,and the water inlet angle from 32 degrees to 34 degrees,the hull models of six bow configuration schemes are designed and generated on the basis of the existing 5000 TEU container mother ship by using B-spline curve fitting.(2)According to the definition of ship ice coordinate system,when using flat ice fracture model and ship-ice geometric contact,the ice will produce circumferential cracks parallel to the contact surface or radial cracks perpendicular to the contact surface.According to the above assumptions,a numerical model under low-speed ice-breaking mode is built,and a numerical simulation software is used to write a calculation program and solve the ice load.(3)The hull is modeled according to six different bow configuration schemes,and the waterline surface is discretized to obtain the number of points on the three waterline surfaces.