Some remarks on the flux-free finite element method for immiscible two-fluid flows
Journal of Computational and Applied Mathematics
Journal of Computational Physics
Acquired Clustering Properties and Solution of Certain Saddle Point Systems
SIAM Journal on Matrix Analysis and Applications
Robust preconditioners for the high-contrast Stokes equation
Journal of Computational and Applied Mathematics
An asymptotic solution approach for elliptic equations with discontinuous coefficients
Journal of Computational Physics
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We consider a stationary Stokes problem with a piecewise constant viscosity coefficient. For the variational formulation of this problem we prove a well-posedness result in which the constants are uniform with respect to the jump in the viscosity coefficient. We apply a standard discretization with a pair of LBB stable finite element spaces. The main result of the paper is an infsup result for the discrete problem that is uniform with respect to the jump in the viscosity coefficient. From this we derive a robust estimate for the discretization error. We prove that the mass matrix with respect to some suitable scalar product yields a robust preconditioner for the Schur complement. Results of numerical experiments are presented that illustrate this robustness property.