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http://dx.doi.org/10.12989/ose.2021.11.4.313

Dynamics of moored arctic spar interacting with drifting level ice using discrete element method  

Jang, HaKun (LSU Center for Computation and Technology)
Kim, MooHyun (Department of Ocean Engineering, Texas A&M University)
Publication Information
Ocean Systems Engineering / v.11, no.4, 2021 , pp. 313-330 More about this Journal
Abstract
In this study, the dynamic interaction between an Arctic Spar and drifting level ice is examined in time domain using the newly developed ice-hull-mooring coupled dynamics program. The in-house program, CHARM3D, which is the hull-riser-mooring coupled dynamic simulator is extended by coupling with the open-source discrete element method (DEM) simulator, LIGGGHTS. In the LIGGGHTS module, the parallel-bonding method is implemented to model the level ice using an assembly of multiple bonded spherical particles. As a case study, a spread-moored Artic Spar platform, whose hull surface near waterline is the inverted conical shape, is chosen. To determine the breaking-related DEM parameter (the critical bonding strength), the four-point numerical bending test is used. A series of numerical simulations is systematically performed under the various ice conditions including ice drift velocity, flexural strength, and thickness. Then, the effects of these parameters on the ice force, platform motions, and mooring tensions are discussed. The simulations reveal various features of dynamic interactions between the drifting ice and moored platform for various ice conditions including the novel synchronous resonance at low ice speed. The newly developed simulator is promising and can repeatedly be used for the future design and analysis including ice-floater-mooring coupled dynamics.
Keywords
arctic spar; DEM simulation; ice-floater-mooring dynamics; level ice; parametric study; parallel bonding method; synchronous resonance;
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