A two-step optimized coarse propagator for parareal algorithms achieves a convergence factor of about 0.0064 on parabolic PDEs, far below standard choices while maintaining moderate cost.
ParaDiag: parallel-in-time algorithms based on the diagonalization technique
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Optimized Two-Step Coarse Propagators in Parareal Algorithms
A two-step optimized coarse propagator for parareal algorithms achieves a convergence factor of about 0.0064 on parabolic PDEs, far below standard choices while maintaining moderate cost.