Computer Methods in Applied Mechanics and Engineering
A Robust Finite Element Method for Darcy--Stokes Flow
SIAM Journal on Numerical Analysis
SIAM Journal on Numerical Analysis
Continuous Interior Penalty Finite Element Method for Oseen's Equations
SIAM Journal on Numerical Analysis
A unified stabilized method for Stokes' and Darcy's equations
Journal of Computational and Applied Mathematics
Calcolo: a quarterly on numerical analysis and theory of computation
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We use low order approximations, piecewise linear, continuous velocities and piecewise constant pressures to compute solutions to Brinkman's equation of porous media flow, applying an edge stabilization term to avoid locking. In order to handle the limiting case of Darcy flow, when only the velocity component normal to the boundary can be prescribed, we impose the boundary conditions weakly using Nitsche's method [J. Nitsche, Uber ein Variationsprinzip zur Losung von Dirichlet-Problemen bei Verwendung von Teilraumen, die keinen Randbedingungen unterworfen sind, Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg 36 (1971) 9-15]. We show that this leads to a stable method for all choices of material parameters. Finally we present some numerical examples verifying the theoretical predictions and showing the effect of the weak imposition of boundary conditions.