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Multigrid solvers and multigrid preconditioners for the solution of variational data assimilation problems

Laurent Debreu 1, * Emilie Neveu 2 Ehouarn Simon 3 François-Xavier Le Dimet 1 Arthur Vidard 1, *
* Corresponding author
1 MOISE - Modelling, Observations, Identification for Environmental Sciences
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology
Abstract : In order to lower the computational cost of the variational data assimilation process, we investigate the use of multigrid methods to solve the associated optimal control system. On a linear advection equation, we study the impact of the regularization term of the optimal control and the impact of discretization errors on the efficiency of the coarse grid correction step. We show that even if the optimal control problem leads to the solution of an elliptic system, numerical errors introduced by the discretization can alter the success of the multigrid methods. The view of the multigrid iteration as a preconditioner for a Krylov optimization method leads to a more robust algorithm. A scale dependent weighting of the multigrid preconditioner and the usual background error covariance matrix based preconditioner is proposed and brings significant improvements.
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Submitted on : Friday, October 18, 2013 - 12:39:44 PM
Last modification on : Thursday, January 20, 2022 - 5:28:08 PM
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  • HAL Id : hal-00874643, version 1



Laurent Debreu, Emilie Neveu, Ehouarn Simon, François-Xavier Le Dimet, Arthur Vidard. Multigrid solvers and multigrid preconditioners for the solution of variational data assimilation problems. 2013. ⟨hal-00874643⟩



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