Discrete Element Simulation Of Interaction Between Mooring Structures And Sea Ice

The exploitation of ice resources has become a hot topic in the current research.In the paper,discrete element numerical method is used to study the motion response and dynamic law of anchor structures in floating ice.Firstly,the coupling model of mooring structures in ice environment is established by programming.Then,the correctness of the coupling model is verified by comparing with the calculated results of AQWA software,the measured data of floating ice impact and the field measurement data of Kulluk.Finally,the structure-ice-anchor coupling model is used to analyze the anchor floating platform and mooring ship.The main research contents of this paper include(1)The discrete element theory and mooring numerical model are described,and the calculated results are compared with the calculation results of AQWA's static water roll model of mooring platform,verifying the correctness of the coupling model of anchor platform.(2)Establish the floating ice impact model,and compare it with the measured data of relevant floating ice impact structures in the ice area to verify the correctness of the discrete element sea ice impact model.Furthermore,the structure-ice-anchor coupling model is established and compared with the field measurement data of the Kulluk floating drilling platform to verify the reliability of the coupling model.(3)The coupling model is used to simulate the cylinder semi-submersible floating platform and the column stable semi-submersible floating platform in the ice area,and the conclusion is that the cylinder semi-submersible floating platform is more suitable for the operation in the environment of dense sea ice and high velocity is drawn.Based on the analysis of the mooring system of the floating platform with anchor system in the ice floe area,the law of the influence of the number of anchor chains and the breakage of anchor chains on the dynamic response of the platform is obtained(4)The established coupling model is used to analyze the motion response of mooring ships under the action of floating ice,and the ice load after anchoring and the motion response of ships under the action of sea ice with different density,velocity and thickness of sea ice are obtained.