Convergence analysis of an augmented dual-mixed fnite element method with skew-symmetric Nitsche stabilization for the generalized Oseen equations with mixed boundary conditions
Abstract
In this paper, we propose and analyze a new skew-symmetric Nitsche-augmented mixed scheme for the generalized Oseen equations with non-solenoidal convective fields, subject to mixed boundary conditions. The scheme is based on a continuous pseudostress-velocity augmented dual-mixed finite element formulation, in which the Dirichlet datum is imposed naturally, whereas the prescribed normal trace of the pseudostress is incorporated into the H(div,) stress space. We establish the well-posedness of the continuous formulation by means of a classical lifting argument and its corresponding homogeneous problem. The essential boundary condition is then weakly enforced in the discrete scheme through suitable stabilizing Nitsche terms. We establish the existence and uniqueness of the solution to the discrete scheme, allowing the use of general conforming approximation spaces for both the pseudostress and the velocity. Moreover, in the case of homogeneous Dirichlet boundary conditions and general Neumann data, we establish the stability of the Nitsche scheme. Under mild regularity assumptions on the exact solution, we prove optimal convergence rates in an energy norm. Finally, numerical experiments in two and three dimensions confirm the theoretical convergence rates and assess the performance of the proposed scheme for non-solenoidal convective fields and solutions exhibiting boundary layers.
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BibTeX
@misc{carcamo2026convergence,
title = {{Convergence analysis of an augmented dual-mixed fnite element method with skew-symmetric Nitsche stabilization for the generalized Oseen equations with mixed boundary conditions}},
author = {Cristian Cárcamo and Abner Haguit Poza and Ramiro James Rebolledo},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.38032},
eprint = {2610.38032},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.38032},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Convergence analysis of an augmented dual-mixed fnite element method with skew-symmetric Nitsche stabilization for the generalized Oseen equations with mixed boundary conditions
AU - Cristian Cárcamo
AU - Abner Haguit Poza
AU - Ramiro James Rebolledo
PY - 2026
DA - 2026/10/27
PB - arXiv
DO - 10.48550/arxiv.2610.38032
UR - https://arxiv.org/abs/2610.38032
AB - In this paper, we propose and analyze a new skew-symmetric Nitsche-augmented mixed scheme for the generalized Oseen equations with non-solenoidal convective fields, subject to mixed boundary conditions. The scheme is based on a continuous pseudostress-velocity augmented dual-mixed finite element formulation, in which the Dirichlet datum is imposed naturally, whereas the prescribed normal trace of the pseudostress is incorporated into the H(div,) stress space. We establish the well-posedness of the continuous formulation by means of a classical lifting argument and its corresponding homogeneous problem. The essential boundary condition is then weakly enforced in the discrete scheme through suitable stabilizing Nitsche terms. We establish the existence and uniqueness of the solution to the discrete scheme, allowing the use of general conforming approximation spaces for both the pseudostress and the velocity. Moreover, in the case of homogeneous Dirichlet boundary conditions and general Neumann data, we establish the stability of the Nitsche scheme. Under mild regularity assumptions on the exact solution, we prove optimal convergence rates in an energy norm. Finally, numerical experiments in two and three dimensions confirm the theoretical convergence rates and assess the performance of the proposed scheme for non-solenoidal convective fields and solutions exhibiting boundary layers.
ER -