TY - JOUR A1 - Weiser, Martin T1 - Faster SDC convergence on non-equidistant grids by DIRK sweeps T2 - BIT Numerical Mathematics N2 - Spectral deferred correction methods for solving stiff ODEs are known to converge rapidly towards the collocation limit solution on equidistant grids, but show a much less favourable contraction on non-equidistant grids such as Radau-IIa points. We interprete SDC methods as fixed point iterations for the collocation system and propose new DIRK-type sweeps for stiff problems based on purely linear algebraic considerations. Good convergence is recovered also on non-equidistant grids. The properties of different variants are explored on a couple of numerical examples. Y1 - 2015 UR - https://opus4.kobv.de/opus4-zib/frontdoor/index/index/docId/4673 VL - 55 IS - 4 SP - 1219 EP - 1241 ER -