Volume 57, Number 1, January-February 2023
|Page(s)||29 - 67|
|Published online||12 January 2023|
Exponential convergence of hp-time-stepping in space-time discretizations of parabolic PDES*
Faculty of Mathematics, University of Vienna, Vienna, Austria
2 Seminar for Applied Mathematics, ETH Zürich, 8092 Zürich, Switzerland
** Corresponding author: firstname.lastname@example.org
For linear parabolic initial-boundary value problems with self-adjoint, time-homogeneous elliptic spatial operator in divergence form with Lipschitz-continuous coefficients, and for incompatible, time-analytic forcing term in polygonal/polyhedral domains D, we prove time-analyticity of solutions. Temporal analyticity is quantified in terms of weighted, analytic function classes, for data with finite, low spatial regularity and without boundary compatibility. Leveraging this result, we prove exponential convergence of a conforming, semi-discrete hp-time-stepping approach. We combine this semi-discretization in time with first-order, so-called “h-version’’ Lagrangian Finite Elements with corner-refinements in space into a tensor-product, conforming discretization of a space-time formulation. We prove that, under appropriate corner- and corner-edge mesh-refinement of D, error vs. number of degrees of freedom in space-time behaves essentially (up to logarithmic terms), to what standard FEM provide for one elliptic boundary value problem solve in D. We focus on two-dimensional spatial domains and comment on the one- and the three-dimensional case.
Mathematics Subject Classification: 65N30 / 65J15
Key words: Parabolic IBVP / space-time methods / hp-FEM / exponential convergence
© The authors. Published by EDP Sciences, SMAI 2023
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