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- Gabriel N. Gatica, Ricardo Oyarzúa, Francisco-Javier Sayas
- Math. Comput.
- 2011

In this paper we analyze fully-mixed finite element methods for the coupling of fluid flow with porous media flow in 2D. Flows are governed by the Stokes and Darcy equations, respectively, and the corresponding transmission conditions are given by mass conservation, balance of normal forces, and the Beavers-Joseph-Saffman law. The fully-mixed concept… (More)

- Jessika Camaño, Gabriel N. Gatica, Ricardo Oyarzúa, Giordano Tierra
- SIAM J. Numerical Analysis
- 2016

- Marco Discacciati, Ricardo Oyarzúa
- Numerische Mathematik
- 2017

- Jessika Camaño, Ricardo Oyarzúa, Giordano Tierra
- Math. Comput.
- 2017

In this paper we propose and analyze a new augmented mixed finite element method for the Navier-Stokes problem. Our approach is based on the introduction of a “nonlinear-pseudostress” tensor linking the pseudostress tensor with the convective term, which leads to a mixed formulation with the nonlinearpseudostress tensor and the velocity as the main unknowns… (More)

- Ricardo Oyarzúa, Ricardo Ruiz-Baier
- SIAM J. Numerical Analysis
- 2016

We propose a new formulation along with a family of finite element schemes for the approximation of the interaction between fluid motion and linear mechanical response of a porous medium, known as Biot’s consolidation problem. The steady-state version of the system is recast in terms of displacement, pressure, and volumetric stress, and both continuous and… (More)

A new stress-based mixed variational formulation for the stationary Navier-Stokes equations with constant density and variable viscosity depending on the magnitude of the strain tensor, is proposed and analyzed in this work. Our approach is a natural extension of a technique applied in a recent paper by some of the authors to the same boundary value problem… (More)

- Verónica Anaya, David Mora, Ricardo Oyarzúa, Ricardo Ruiz-Baier
- Numerische Mathematik
- 2016

This paper deals with the analysis of new mixed finite element methods for the Brinkman equations formulated in terms of velocity, vorticity and pressure. Employing the Babuška–Brezzi theory, it is proved that the resulting continuous and discrete variational formulations are well-posed. In particular, we show that Raviart– Thomas elements of order k ≥ 0… (More)

- Sergio Caucao, Gabriel N. Gatica, Ricardo Oyarzúa, Ivana Sebestová
- J. Num. Math.
- 2017

We propose and analyse an augmented mixed finite element method for the coupling of fluid flow with porous media flow. The flows are governed by a class of nonlinear Navier–Stokes and linear Darcy equations, respectively, and the transmission conditions are given by mass conservation, balance of normal forces, and the Beavers–Joseph–Saffman law. We apply… (More)

- Ricardo Oyarzúa, Paulo Zúñiga
- J. Computational Applied Mathematics
- 2017

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