A New Technique for Prediction of Ship-Ice Floes Interaction Without Fluids

Abstract

As global warming reduces Arctic sea ice level, Russia’s Arctic resource development is taking place in earnest. For this reason, it is important to determine the structural safety at the initial stage of the ship design, because the ship operating at the Arctic route has large loads to the ship hull. For this purpose, many researches have been conducted in various ways including analytical methods and model tests. Analytical methods are used in two ways. One is ice resistance of ship, and the other is structural crashworthiness. The approaches of ice resistance prediction of a ship are is including empirical formulas, multi-body dynamics (MDB), and discrete element method (NDEM). Structural crashworthiness can be estimated using empirical formulas and FEA simulation. In this study, a new approach is given considering both ice resistances of ship and structural crashworthiness without modeling fluids, simultaneously. Therefore, analysis cost has reduced due to eliminating fluid consideration. The hydrostatic and hydrodynamic forces acting on ice floes are realized by directly controlling the real time hydro-forces during the ship-to-ice collision analysis. The procedure is achieved through a user defined-subroutine. The developed user-subroutine was applied to the towing test simulations of Korean icebreaking research vessel ARAON. As a result, ice-induced resistance was calculated and compared with the experimental results. ？ 2021, Springer Nature Singapore Pte Ltd.