A mixed formulation of the Bingham fluid flow problem: Analysis and numerical solution |
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Authors: | Alexis Aposporidis Eldad Haber Maxim A Olshanskii Alessandro Veneziani |
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Affiliation: | 1. Department of Mathematics and Statistics, FBAS, International Islamic University, Islamabad, 44000, Pakistan;2. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai China;3. Department of Mathematical Sciences, Federal Urdu University of Arts, Science & Technology, Islamabad, Pakistan |
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Abstract: | In this paper we introduce a mixed formulation of the Bingham fluid flow problem. We consider both the original and a regularized version of the problem, where a parameter ε is introduced, forcing the entire domain to be formally a fluid region. In general, common solvers for the regularized problem experience a performance degradation when the parameter ε gets smaller. The method studied here introduces an auxiliary tensor variable and shows enhanced numerical properties for small values of ε. A good performance is also observed for the non-regularized case. The well posedness for the regularized problem and the equivalence – at the continuous level – between the original (primitive variables) and the mixed formulation are demonstrated. We analyze properties of linearized problems that are relevant for the convergence of numerical solvers. A finite element method for the mixed formulation is discussed. Numerical results confirm the predicted better performances of the mixed formulation when compared to the primitive variables formulation. A comparison to a non-regularized solver based on the augmented Duvaut–Lions–Glowinski formulation of the problem is carried out as well. |
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