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• W3216615103 abstract "We present and analyze a cut finite element method for the weak imposition of the Neumann boundary conditions of the Darcy problem. The Raviart-Thomas mixed element on both triangular and quadrilateral meshes is considered. Our method is based on the Nitsche formulation studied in [10.1515/jnma-2021-0042] and can be considered as a first attempt at extension in the unfitted case. The key feature is to add two ghost penalty operators to stabilize both the velocity and pressure fields. We rigorously prove our stabilized formulation to be well-posed and derive a priori error estimates for the velocity and pressure fields. We show that an upper bound for the condition number of the stiffness matrix holds as well. Numerical examples corroborating the theory are included." @default.
• W3216615103 created "2021-12-06" @default.
• W3216615103 creator A5087200001 @default.
• W3216615103 date "2021-11-18" @default.
• W3216615103 modified "2023-09-27" @default.
• W3216615103 title "A cut finite element method for the Darcy problem" @default.
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