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Response of small sea ice floes in regular waves: A comparison of numerical and experimental results

Bai, W; Zhang, T; McGovern, DJ; (2017) Response of small sea ice floes in regular waves: A comparison of numerical and experimental results. Ocean Engineering , 129 pp. 495-506. 10.1016/j.oceaneng.2016.10.045. Green open access

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Abstract

In severe seas ice floes can gain significant kinetic energy presenting a hazard to offshore structures and shipping. A numerical investigation is presented to investigate the kinematic response of sea ice floes in waves. The results are compared against available experimental data. The surge, heave and drift velocity are analyzed for various different ice floe shapes using the potential flow model HydroSTAR® and the viscous flow CFD model OpenFOAM®. The results show relative wavelength (λ normalized with floe length Lc) λ/Lc strongly influences heave and surge, with a heave resonance occurring at λ/Lc=8 for the cubic floe not being correspondingly observed for the square floe. The heave Response Amplitude Operator (RAO) is found to increase with floe thickness with a resonance occurring when relative thickness b/Lc≥0.5. Shape is observed to be less important than thickness. At small values of λ/Lc the floe is observed to move forward over the whole wavelength resulting in its drift displacement. Both vertical velocity relative to theoretical particle velocity Vy/Vp and ratio of forward and backward velocities show resonance at λ/Lc=8. Comparing with experimental data, the linear analysis using HydroSTAR® overestimates the heave and surge RAOs. OpenFOAM®, however, appears to provide a much better agreement with the experimental data indicating viscosity plays an important role in floe kinematics.

Type: Article
Title: Response of small sea ice floes in regular waves: A comparison of numerical and experimental results
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.oceaneng.2016.10.045
Publisher version: http://doi.org/10.1016/j.oceaneng.2016.10.045
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Technology, Physical Sciences, Engineering, Marine, Engineering, Civil, Engineering, Ocean, Oceanography, Engineering, Ice floe, Dynamic response, Linear analysis, Computational fluid dynamics, Experimental study, FLOATING ELASTIC DISCS, OCEAN WAVES, HYDROELASTIC RESPONSE, OPENFOAM(R), MOTION, GENERATION, ICEBERGS
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
URI: https://discovery.ucl.ac.uk/id/eprint/1529762
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