Parareal with a coarse solver built from low-rank SVD approximations of the fine solver accelerates convergence for parabolic PDEs, with error bounds depending on the truncated singular values.
Multi-step variant of the parareal algorithm: convergence analysis and numerics
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A Parareal Algorithm with Low-Rank Coarse Solvers
Parareal with a coarse solver built from low-rank SVD approximations of the fine solver accelerates convergence for parabolic PDEs, with error bounds depending on the truncated singular values.