An improvement of multigrid methods using multiple grids on each layer for parallel computing
Received:December 18, 2019  Revised:March 17, 2020
Key Word: linear systems, multigrid, preconditioner  
Fund ProjectL:JST/ACT-I (No. JPMJPR16U6) and JSPS KAKENHI (No. 17K12690, 18H03250, 19KK0255)
Author NameAffiliationE-mail
Akira Imakura University of Tsukuba 
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      Multigrid methods are widely used and well studied for linear solvers and preconditioners of Krylov subspace methods. Multigrid method is one of the most powerful approaches for solving large scale linear systems; however, it may show low parallel efficiency on coarse grids. There are several kinds of research on this issue. In this paper, we intend to overcome this difficulty by proposing a novel multigrid algorithm that has multiple grids on each layer. Numerical results indicate that the proposed method shows a better convergence rate compared with the existing multigrid method.
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