Very efficient ship-to-ice interaction simulations using user-subroutine of a commercial finite element code

초록

It is important to ensure structural safety of icebreakers subjected to impact loads by various sizes of sea ices. A new approach is proposed to predict the resistance due to ship-to-brash ice interaction without modeling fluid domain. The real time hydro-forces can be applied to ice floes considering ice kinematics. The surge motion by the proposed technique was compared with CFD results. A Korean icebreaker research vessel was employed to simulate navigation through brash ice channel. Uniform ices were modeled keeping concentration ratios constant. The brash ices were modeled as rigid, elastic, two plastic materials. Simulation results based on the rigid and elastic material models are in good agreement with test result. Intentional increase of the drag coefficient in rigid material model led to a result consistent with the experimental results. Simulation time of the elastic material model was four times longer than that of the rigid material model. © 2020 Taylor and Francis Group, London.