Krylov improvements of the Uzawa method for Stokes type operator matrices
Owe Axelsson, János Karátson · Numerische Mathematik · 2021
Abstract The paper is devoted to Krylov type modifications of the Uzawa method on the operator level for the Stokes problem in order to accelerate convergence. First block preconditioners and their effect on convergence are studied. Then it is shown that a Krylov–Uzawa iteration produces superlinear convergence on smooth domains, and estimation is given on its speed.