Prediction of Ice Resistance of an Icebreaker under Level Ice

초록

Icebreakers going through level ice zone in the Arctic Sea routes are subjected to level icebreaking loads and broken ice floe and pack ice-induced loads simultaneously; hence, it is important to estimate the ice loads on the icebreaker. This paper aims to estimate ice resistance of a model icebreaker which is towed through an ice sheet zone in a Korean arctic basin. In this study, a new approach using HydroQus, hydrodynamic subroutine for Abaqus, without Eulerian domain was introduced. The icebreaker model ship was modeled as a rigid body. HydroQus supplied non-linear hydrostatic force and hydrodynamic force in real time to the ice sheet and the broken ices separated from the level ice after the ship's ice breaking. Hydrodynamic form-induced drag forces were exerted on the level ice and the broken ices. Ice material was modeled with four node tetrahedron elements. Drucker-Prager yield function was applied to the level ice. Continuum damage mechanics model was introduced to involve ice breaking. The level icebreaking was very well simulated showing realistic breaking pattern. The broken pack ices separated from the level ice due to icebreaking were interacted with hull bottom. © 2023 Lulea University of Technology. All rights reserved.

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