Numerical solution of parabolic problems based on a weak space-time formulation
Preprint, 2016

We investigate a weak space-time formulation of the heat equation and its use for the construction of a numerical scheme. The formulation is based on a known weak space-time formulation, with the difference that a pointwise component of the solution, which in other works is usually neglected, is now kept. We investigate the role of such a component by first using it to obtain a pointwise bound on the solution and then deploying it to construct a numerical scheme. The scheme obtained, besides being quasi-optimal in the L2 sense, is also pointwise superconvergent in the temporal nodes. We prove a priori error estimates and we present numerical experiments to empirically support our findings.

space-time

inf-sup

superconvergence

quasi-optimality

finite ele- ment

Petrov–Galerkin.

error estimate

Författare

Stig Larsson

Chalmers, Matematiska vetenskaper, Matematik

Göteborgs universitet

Matteo Molteni

Göteborgs universitet

Chalmers, Matematiska vetenskaper, Matematik

Ämneskategorier

Matematik

Beräkningsmatematik

Fundament

Grundläggande vetenskaper