Abstract
This paper introduces a novel three-field formulation for the Bingham flow problem and its two-dimensional version named after Mosolov together with low-order discretizations: a nonconforming for the classical formulation and a mixed finite element method for the three-field model. The two discretizations are equivalent and quasi-optimal in the sense that the \(H^1\) error of the primal variable is bounded by the error of the \(L^2\) best-approximation of the stress variable. This improves the predicted convergence rate by a log factor of the maximal mesh-size in comparison to the first-order conforming finite element method in a model scenario. Despite that numerical experiments lead to comparable results, the nonconforming scheme is proven to be quasi-optimal while this is not guaranteed for the conforming one.
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The third named author was supported by the Berlin Mathematical School.
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Carstensen, C., Reddy, B.D. & Schedensack, M. A natural nonconforming FEM for the Bingham flow problem is quasi-optimal. Numer. Math. 133, 37–66 (2016). https://doi.org/10.1007/s00211-015-0738-1
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DOI: https://doi.org/10.1007/s00211-015-0738-1