Abstract
We present a new approach for preconditioning the interface Schur complement arising in the domain decomposition of second-order scalar elliptic problems. The preconditioners are discrete interpolation norms recently introduced in Arioli & Loghin (2009, Discrete interpolation norms with applications. SIAM J. Numer. Anal., 47, 2924–2951). In particular, we employ discrete representations of norms for the Sobolev space of index 1/2 to approximate the Steklov–Poincaré operators arising from nonoverlapping one-level domain decomposition methods. We use the coercivity and continuity of the Schur complement with respect to the preconditioning norm to derive mesh-independent bounds on the convergence of iterative solvers. We also address the case of nonconstant coefficients by considering the interpolation of weighted spaces and the corresponding discrete norms.
Original language | English |
---|---|
Pages (from-to) | 318-342 |
Journal | I M A Journal of Numerical Analysis |
Volume | 33 |
DOIs | |
Publication status | Published - 1 Jan 2013 |
Keywords
- fractional Sobolev norms;
- square-root Laplacian
- interface preconditioners
- domain decomposition
- generalized Lanczos algorithm