2023
DOI: 10.21203/rs.3.rs-2492974/v1
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A low-rank update for relaxed Schur complementpreconditioners in fluid flow problems

Abstract: The simulation of fluid dynamic problems often involves solving large-scale saddle-point systems.Their numerical solution with iterative solvers requires efficient preconditioners. Low-rank updates canadapt standard preconditioners to accelerate their convergence. We consider a multiplicative low-rank cor-rection for pressure Schur complement preconditioners that is based on a (randomized) low-rank approxi-mation of the error between the identity and the preconditioned Schur complement. We further introducea r… Show more

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