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Research Papers: Offshore Technology

Simulation of Wave Interaction With a Circular Ice Floe

[+] Author and Article Information
Luofeng Huang

Department of Mechanical Engineering,
University College London,
London WC1E 6BT, UK
e-mail: ucemlhu@ucl.ac.uk

Giles Thomas

Department of Mechanical Engineering,
University College London,
London WC1E 6BT, UK
e-mail: giles.thomas@ucl.ac.uk

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received October 7, 2018; final manuscript received November 19, 2018; published online January 17, 2019. Assoc. Editor: Søren Ehlers.

J. Offshore Mech. Arct. Eng 141(4), 041302 (Jan 17, 2019) (9 pages) Paper No: OMAE-18-1172; doi: 10.1115/1.4042096 History: Received October 07, 2018; Revised November 19, 2018

Global warming is inducing sea ice retreat, which is opening new shipping routes and extending the accessible area for resource exploration. This encourages an increasing research interest in sea ice behavior. With the sea ice melting, level ice is broken up by waves propagated from the open ocean, resulting in an environment where both floating ice floes and waves exist. Such wave–ice interaction can bring significant influences on the potential human activities. This work presents a series of numerical simulations to predict the behavior of a circular ice floe forced by regular waves, with different wavelength and wave amplitude conditions being investigated. The numerical model was validated against experiments, and it revealed good accuracy in predicting the rigid body motion of an ice floe, including some extreme cases that are difficult to model by previous methods. Two specific behaviors were observed during the numerical simulations, namely overwash and scattering. Both behaviors are discussed in detail to analyze their linear/nonlinear effect on the ice floe motion. The applied model could be used to provide valuable estimations for arctic engineering purposes.

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Figures

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Fig. 2

Sketch of the computational domain and applied boundary conditions

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Fig. 1

Schematic of the case: a circular ice floe is freely floating on the water surface and subjected to incoming regular waves generated by a numerical wavemaker, where the surge, heave and pitch motions are its main hydrodynamic responses

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Fig. 3

The geometry of the two disks. Left panel: the disk with an edge barrier (disk B); right panel: the disk without edge barrier (disk NB).

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Fig. 4

Mesh layout of the CFD model. High resolution was applied to the free surface area and where the disk is expected to move: (a) plan view and (b) profile view.

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Fig. 10

Heave RAO of disk B (dash line) and disk NB (solid line), as a function of wave amplitude, alongside the type of overwash. Trend lines (dot line) are also included: (a) λ/D = 2.5 and (b) λ/D = 1.725.

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Fig. 11

The interaction of disk B with waves, at different wavelengths: (a) λ/D = 3.525, (b) λ/D = 2, and (c) λ/D = 1.525

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Fig. 5

Generated waves with different cell numbers per wave height. The target waves are of λ = 2.38 m and a =40 mm.

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Fig. 6

RAO values with different global cell numbers. The applied wave condition was λ = 2.38 m and a =40 mm.

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Fig. 7

Computational and experimental [16] RAOs, as a function of non-dimensional wavelength: (a) surge RAO of disk B, (b) surge RAO of disk NB, (c) heave RAO of disk B, (d) heave RAO of disk NB, (e) pitch RAO of disk B, and (f) pitch RAO of disk NB

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Fig. 8

CFD illustration of partial overwash and full overwash: (a) partial overwash overview, (b) full overwash overview, (c) partial overwash close-up animation, and (d) full overwash close-up animation

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Fig. 9

RAO comparisons between disk B (dash line) and disk NB (solid line), as a function of nondimensional wavelength, alongside the type of overwash: (a) surge, (b) heave, and (c) pitch

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