G. Wimmer

Broken-space Additive Schwarz Mass Inverse Approximations and (Block) Preconditioning

Finite-element mass matrix solves and approximate inverses arise often in explicit time integration as well as Schur-complement-based block preconditioning. A diagonal approximation of the mass matrix is cheap and widely used, but can be a poor approximation, particularly for high-order elements. This paper introduces...