A finite-element treatment of sea ice dynamics for different ice rheologies

Schulkes, R. M.S.M., Morland, L. W. and Staroszczyk, R. (1998) A finite-element treatment of sea ice dynamics for different ice rheologies. International Journal for Numerical and Analytical Methods in Geomechanics, 22 (3). pp. 153-174. ISSN 0363-9061

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Abstract

In this paper the effects of four different rheologies on the evolution of a large-scale sea ice pack are determined and compared. Two rheologies are of viscous-plastic form, and two are viscous fluid relations. The initial pack domain is rectangular, and the motion is driven by wind stress and resisted by ocean drag. Two adjacent edges are rigid shore boundaries, and the other two are free boundaries at open water which move during the pack motion, so that the pack domain changes in time. Two different forms of boundary conditions at the rigid shore edges are considered, which also influence the evolution. The governing equations are solved numerically using a finite-element method, and, unlike previous numerical treatments, no artificial viscosity is incorporated to stabilise the algorithm near interfaces between converging and diverging flow. Instability arises when any tensile stress is abruptly cut-off when diverging flow is initiated, and an alternative view is offered.

Item Type: Article
Uncontrolled Keywords: finite-element,rheology,sea ice pack,viscous fluid,viscous-plastic,computational mechanics,materials science(all),geotechnical engineering and engineering geology,mechanics of materials ,/dk/atira/pure/subjectarea/asjc/2200/2206
Faculty \ School: Faculty of Science > School of Mathematics
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Depositing User: LivePure Connector
Date Deposited: 06 Jul 2021 23:59
Last Modified: 30 Sep 2021 16:37
URI: https://ueaeprints.uea.ac.uk/id/eprint/80418
DOI: 10.1002/(SICI)1096-9853(199803)22:3<153::AID-NAG912>3.0.CO;2-E

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