Small-scale computational fluid dynamics modelling of the wave induced ice floe-grease ice interaction in the Antarctic marginal ice zone

Marquart, Rutger, Bogaers, Alfred, Skatulla, Sebastian, Alberello, Alberto ORCID:, Toffoli, Alessandro and Schwarz, Carina (2024) Small-scale computational fluid dynamics modelling of the wave induced ice floe-grease ice interaction in the Antarctic marginal ice zone. Cold Regions Science and Technology, 219. ISSN 0165-232X

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Computational sea ice models have been developed to simulate sea ice formation, melt and motion characteristics on a regional scale. However, the highly dynamic sea ice behaviour in the Antarctic marginal ice zone (MIZ), the area where sea ice and ocean waves interact, still eludes reliable prediction. This is due to the complex sea ice composition consisting of relatively small and mobile ice floes governed by collision and fracture mechanisms. To improve the accuracy of sea ice models, the realistic sea ice distribution needs to be accounted for at a high resolution so that key aspects defining the interplay of ice motion and wave propagation can be suitably distinguished. In this work a computational fluid dynamics model based on the small-scale continuum approach has been developed to simulate the dynamics of a heterogeneous sea ice cover. The model makes use of a realistic sea ice layout and studies the mechanical behaviour of sea ice as affected by wave forcing and the specific material properties of ice floes and grease ice. Taking advantage of the continuum approach paired with a heterogeneous sea ice cover, the floe-grease ice interaction is elucidated by discussing detailed temporal and spatial distributions of the mechanical response of sea ice. Results show that the interplay between waves and the ice floe collision behaviour is directly controlled by sea ice inertia, where the frequency and severity of ice floe collisions increase with the wave period. Furthermore, the interaction of grease ice with ice floes through form drag at the interface leads to high localised grease ice strain rate gradients and low viscosity values due its shear thinning characteristics.

Item Type: Article
Additional Information: Acknowledgements: Computations were performed using facilities provided by the University of Cape Town's ICTS High Performance Computing team: This research has been supported by the National Research Foundation of South Africa (Grant Nos. 104839 and 105858). Opinions expressed and conclusions arrived at, are those of the author and are not necessarily to be attributed to the NRF. AA and AT acknowledge support from the ACE Foundation–Ferring Pharmaceuticals and the Australian Antarctic Science Program (project 4434). AA acknowledges support from the Japanese Society for the Promotion of Science (PE19055).
Uncontrolled Keywords: cfd,sea ice rheology,marginal ice zone,ice floe collision,ice floe-grease ice interaction,openfoam
Faculty \ School: Faculty of Science > School of Mathematics
UEA Research Groups: Faculty of Science > Research Groups > Fluid and Solid Mechanics
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Depositing User: LivePure Connector
Date Deposited: 11 Jan 2024 01:39
Last Modified: 04 Mar 2024 18:25
DOI: 10.1016/j.coldregions.2023.104108


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