the Multiscale Robin Coupled Method
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Accelerating GMRES with Matrix-Free Multiscale Robin Preconditioners
arXiv:2606.08883v1 Announce Type: new Abstract: We propose a matrix-free right-preconditioning strategy for the Generalized Minimal Residual (GMRES) method based on the Multiscale Robin Coupled Method with oversampling (MRCM-OS) for the numerical solution of elliptic problems arising in subsurface flow. The resulting preconditioner is constructed through local subdomain solves with oversampling and smoothing, and can be applied without explicit assembly of the global operator. After a...