A spectral coarse-space preconditioner based on MS-GFEM makes GMRES robust to Péclet number and subdomain count for convection-diffusion, demonstrated in experiments up to 100,000 subdomains.
Constrained Local Approximate Ideal Restriction for Advection-Diffusion Problems
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Robust spectral preconditioning for high-P\'{e}clet number convection-diffusion
A spectral coarse-space preconditioner based on MS-GFEM makes GMRES robust to Péclet number and subdomain count for convection-diffusion, demonstrated in experiments up to 100,000 subdomains.