A new level-dependent coarse grid correction scheme for indefinite Helmholtz problems
A new level-dependent coarse grid correction scheme for indefinite Helmholtz problems
In this paper we construct and analyse a level-dependent coarsegrid correction scheme for indefinite Helmholtz problems. This adapted multigrid method is capable of solving the Helmholtz equation on the finest grid using a series of multigrid cycles with a grid-dependent complex shift, leading to a stable correction scheme on all …