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research-article

Numerical Study of a Moored Structure in Moving Broken Ice Driven by Current and Wave

[+] Author and Article Information
Biao Su

SINTEF Ocean, Postboks 4762 Torgard, N-7465 Trondheim, Norway
biao.su@sintef.no

Karl Gunnar Aarsæther

SINTEF Ocean, Postboks 118, N-9252 Tromsø, Norway
karl.gunnar.aarsather@sintef.no

David Kristiansen

SINTEF Ocean, Postboks 4762 Torgard, N-7465 Trondheim, Norway
david.kristiansen@sintef.no

1Corresponding author.

ASME doi:10.1115/1.4042263 History: Received December 25, 2017; Revised October 19, 2018

Abstract

This paper presents a numerical model intended to simulate the mooring force and the dynamic response of a moored structure in drifting ice. The mooring lines were explicitly modelled by using a generic cable model with a set of constraint equations providing desired structural properties such as the axial, bending and torsional stiffness. The 6 degrees-of-freedom (DOF) rigid body motions of the structure were simulated by considering its interactions with the mooring lines and the drifting ice. In this simulation, a fragmented ice field of broken ice pieces could be considered under the effects of current and wave. The ice?ice and ice?structure interaction forces were calculated based on a viscoelastic-plastic rheological model. The hydrodynamic forces acting on the floating structure, mooring line and drifting ice were simplified and calculated appropriately. The present study, in general, demonstrates the potential of developing an integrated numerical model for the coupled analysis of a moored structure in a broken ice field with current and wave.

Copyright (c) 2018 by ASME
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