100 citations · 334 across the 42 of their papers we have counts for
44 papers
Goal-Oriented Adaptive Space-Time Finite Element Methods for Regularized Parabolic p-Laplace Problems
B. Endtmayer, U. Langer, A. Schafelner
We consider goal-oriented adaptive space-time finite-element discretizations of the regularized parabolic p-Laplace problem on completely unstructured simplicial space-time meshes.…
Mass-lumping discretization and solvers for distributed elliptic optimal control problems
Ulrich Langer, Richard Löscher, Olaf Steinbach +1
The purpose of this paper is to investigate the effects of the use of mass-lumping in the finite element discretization of the reduced first-order optimality system arising from a…
An adaptive finite element method for distributed elliptic optimal control problems with variable energy regularization
Ulrich Langer, Richard Löscher, Olaf Steinbach +1
We analyze the finite element discretization of distributed elliptic optimal control problems with variable energy regularization, where the usual norm regularization term…
Robust finite element discretization and solvers for distributed elliptic optimal control problems
Ulrich Langer, Richard Löscher, Olaf Steinbach +1
We consider standard tracking-type, distributed elliptic optimal control problems with regularization, and their finite element discretization. We are investigating the …
Robust space-time finite element error estimates for parabolic distributed optimal control problems with energy regularization
Ulrich Langer, Olaf Steinbach, Huidong Yang
We consider space-time tracking optimal control problems for linear para\-bo\-lic initial boundary value problems that are given in the space-time cylinder , and…
Matrix-free Monolithic Multigrid Methods for Stokes and Generalized Stokes Problems
Daniel Jodlbauer, Ulrich Langer, Thomas Wick +1
We consider the widely used continuous - quadrilateral or hexahedral Taylor-Hood elements for the finite element discretization of the Stokes an…