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• W3100689368 abstract "We investigate the accuracy and robustness of one of the most common methods used in glaciology for the discretization of the $mathfrak{p}$-Stokes equations: equal order finite elements with Galerkin Least-Squares (GLS) stabilization. Furthermore we compare the results to other stabilized methods. We find that the vertical velocity component is more sensitive to the choice of GLS stabilization parameter than horizontal velocity. Additionally, the accuracy of the vertical velocity component is especially important since errors in this component can cause ice surface instabilities and propagate into future ice volume predictions. If the element cell size is set to the minimum edge length and the stabilization parameter is allowed to vary non-linearly with viscosity, the GLS stabilization parameter found in literature is a good choice on simple domains. However, near ice margins the standard parameter choice may result in significant oscillations in the vertical component of the surface velocity. For these cases, other stabilization techniques, such as the interior penalty method, result in better accuracy and are less sensitive to the choice of the stabilization parameter. During this work we also discovered that the manufactured solutions often used to evaluate errors in glaciology are not reliable due to high artificial surface forces at singularities. We perform our numerical experiments in both FEniCS and Elmer/Ice." @default.
• W3100689368 created "2020-11-23" @default.
• W3100689368 creator A5059330584 @default.
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• W3100689368 date "2018-01-29" @default.
• W3100689368 modified "2023-09-30" @default.
• W3100689368 title "Stabilized equal low-order finite elements in ice sheet modeling – accuracy and robustness" @default.
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• W3100689368 doi "https://doi.org/10.1007/s10596-017-9713-5" @default.
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