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Research Papers: Polar and Arctic Engineering

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,
Trondheim N-7465, Norway
e-mail: biao.su@sintef.no

Karl Gunnar Aarsæther

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

David Kristiansen

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

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received December 25, 2017; final manuscript received October 19, 2018; published online January 17, 2019. Assoc. Editor: Carlos Guedes Soares.

J. Offshore Mech. Arct. Eng 141(3), 031501 (Jan 17, 2019) (15 pages) Paper No: OMAE-17-1224; doi: 10.1115/1.4042263 History: Received December 25, 2017; Revised October 19, 2018

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 modeled 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 six 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.

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Figures

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Fig. 1

Illustration of the CP and the normal and tangential contact forces between two interacting ice floes

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Fig. 2

Illustration of the ice–ice (and ice–structure) interaction force model [15]

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Fig. 3

Original frequency-dependent added mass and damping coefficients (WAMIT data) for the heave response of the Kulluk structure, plotted with the reconstructed values from the complex fitted Kijjω function

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Fig. 4

The simulated Kulluk structure with a 12-line mooring system

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Fig. 5

A simulated broken ice field driven by current and wave

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Fig. 6

Plot showing the simulation setup of tight managed ice without pressure

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Fig. 7

Plots showing the simulation setup of managed ice with good ice clearance, where different lateral sizes of the initial ice field were used to represent the variety of actual ice interaction events

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Fig. 8

Plot showing the simulated maximum mooring forces in managed ice with good ice clearance, where different lateral sizes of the initial ice field were used

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Fig. 9

Plots showing the simulation setup of ice floe impacts

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Fig. 10

A simulated time series of the ice floe impact forces and the resulting mooring forces

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Fig. 11

Plot showing the simulated mooring forces due to ice floe impacts and comparison with full-scale data [1]

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Fig. 12

A simulated time series of the total ice and mooring forces acting on the structure (water depth: 52 m; current velocity: 0.3 m/s; and ice concentration: 70%)

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Fig. 13

A simulated time series of the offsets of the structure in the ice drift direction (water depth: 52 m; current velocity: 0.3 m/s; and ice concentration: 70%)

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Fig. 14

Power spectrum density of the simulated time series of offsets (water depth: 52 m; current velocity: 0.3 m/s; and ice concentration: 70%)

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Fig. 15

Plots showing the variation of ice floe clusters in front of the structure (water depth: 52 m; current velocity: 0.3 m/s; and ice concentration: 70%)

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Fig. 16

A simulated time series of the total ice and mooring forces acting on the structure (water depth: 52 m; current velocity: 0.3 m/s; wave period: 15 s; wave height: 1 m; and ice concentration: 70%)

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Fig. 17

A simulated time series of the total ice and mooring forces acting on the structure (water depth: 300 m; current velocity: 0.3 m/s; wave period: 15 s; wave height: 1 m; and ice concentration: 70%)

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Fig. 18

Power spectrum density of the simulated time series of offsets (water depth: 300 m; current velocity: 0.3 m/s; wave period: 15 s; wave height: 1 m; and ice concentration: 70%)

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Fig. 19

Plot showing a comparison between the simulation results and full-scale data [1], where the ice was only driven by current

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Fig. 20

Plot showing the simulated mooring forces of different mooring stiffness in current (current velocity: 0.3 m/s)

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Fig. 21

Plot showing the simulated mooring forces of different mooring stiffness in the combined current and wave (regular) conditions (current velocity: 0.3 m/s; wave period: 15 s; wave height: 1 m)

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Fig. 22

Plot showing the simulated mooring forces (soft mooring) versus ice concentration, in current and the combined current and wave (regular and irregular) conditions (current velocity: 0.3 m/s; mean wave period: 15 s)

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Fig. 23

Plot showing the simulated mooring forces (soft mooring) versus significant wave height, in current and the combined current and wave (irregular) conditions (current velocity: 0.3 m/s; mean wave period: 15 s)

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