Scalable DPG Multigrid Solver for Helmholtz Problems: A Study on Convergence
Abstract
This paper presents a scalable multigrid preconditioner targeting large-scale systems arising from discontinuous Petrov-Galerkin (DPG) discretizations of high-frequency wave operators. This work is built on previously developed multigrid preconditioning techniques of Petrides and Demkowicz (Comput. Math. Appl. 87 (2021) pp. 12-26) and extends the convergence results from degrees of freedom (DOFs) to DOFs using a new scalable parallel MPI/OpenMP implementation. Novel contributions of this paper include an alternative definition of coarse-grid systems based on restriction of fine-grid operators, yielding superior convergence results. In the uniform refinement setting, a detailed convergence study is provided, demonstrating h and p robust convergence and linear dependence with respect to the wave frequency. The paper concludes with numerical results on hp-adaptive simulations including a large-scale seismic modeling benchmark problem with high material contrast.
Cite
@article{arxiv.2304.01728,
title = {Scalable DPG Multigrid Solver for Helmholtz Problems: A Study on Convergence},
author = {Jacob Badger and Stefan Henneking and Socratis Petrides and Leszek Demkowicz},
journal= {arXiv preprint arXiv:2304.01728},
year = {2023}
}