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- W2245985096 abstract "Ice-going ships and offshore structures may need to operate in a wide range of various ice conditions, ranging from continuous level ice to rubble fields and pressure ridges. However, in many practical situations only partial ice covers are present, such as natural pack ice or managed ice. These types of ice cover are discontinuous in nature and can be idealized as a composition of distinct ice pieces. This paper presents a framework for simulating an offshore structure in a discontinuous ice field which is composed of discrete elements representing distinct ice floes. The framework is based on the nonsmooth formulation of the Discrete Element Method (DEM). In this formulation, the contacts between discrete elements are treated as visco-elastic unilateral constraints with energy dissipation through impacts and friction. The system of constraints is formulated as a mathematical optimization problem (linear complementarity problem) and solved iteratively at every timestep. The numerical implementation of the model is based on the commercial physics engine Vortex and the numerical model is used to simulate a model-scale towing experiment of a drillship in managed ice. The paper compares the simulation results to experimental data obtained from a model test performed at the Hamburg Ship Model Basin. The numerical model can be applicable to the simulation of stationkeeping operations of Arctic drillships and other offshore structures in broken ice conditions, or for modelling ice management operations and concepts." @default.
- W2245985096 created "2016-06-24" @default.
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- W2245985096 date "2013-01-01" @default.
- W2245985096 modified "2023-10-16" @default.
- W2245985096 title "Nonsmooth 3D Discrete Element Simulation of a Drillship in Discontinuous Ice" @default.
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