[HTML][HTML] Optimal convergence rates in L2 for a first order system least squares finite element method-part II: Inhomogeneous Robin boundary conditions

M Bernkopf, JM Melenk - Computers & Mathematics with Applications, 2024 - Elsevier
We consider divergence-based high order discretizations of an L 2-based first order system
least squares formulation of a second order elliptic equation with Robin boundary …

Mixed finite elements for Kirchhoff–Love plate bending

T Führer, N Heuer - Mathematics of Computation, 2024 - ams.org
We present a mixed finite element method with triangular and parallelogram meshes for the
Kirchhoff–Love plate bending model. Critical ingredient is the construction of low …

A discontinuous Petrov–Galerkin method for Reissner–Mindlin plates

T Führer, N Heuer, AH Niemi - SIAM Journal on Numerical Analysis, 2023 - SIAM
We present a discontinuous Petrov–Galerkin method with optimal test functions for the
Reissner–Mindlin plate bending model. Our method is based on a variational formulation …

Normal-normal continuous symmetric stresses in mixed finite element elasticity

C Carstensen, N Heuer - Mathematics of Computation, 2024 - ams.org
The classical continuous mixed formulation of linear elasticity with pointwise symmetric
stresses allows for a conforming finite element discretization with piecewise polynomials of …

[HTML][HTML] Approximation properties of primal discontinuous Petrov-Galerkin method on general quadrilateral meshes

AH Niemi - Computers & Mathematics with Applications, 2023 - Elsevier
We consider the approximation properties of primal discontinuous Petrov-Galerkin (DPG)
method on quadrilateral meshes. We show how the previous convergence results as well as …

DPG methods for a fourth-order div problem

T Führer, P Herrera, N Heuer - Computational Methods in Applied …, 2022 - degruyter.com
We study a fourth-order div problem and its approximation by the discontinuous Petrov–
Galerkin method with optimal test functions. We present two variants, based on first and …

A DPG method for the quad-curl problem

T Führer, P Herrera, N Heuer - Computers & Mathematics with Applications, 2023 - Elsevier
We derive an ultraweak variational formulation of the quad-curl problem in two and three
dimensions. We present a discontinuous Petrov–Galerkin (DPG) method for its …

Fem-Implicit/Explicit Surface Mesh Discrete Schemes for 2d-3c Time-Dependent Shallow Shell Problem

R Wu, X Shen, Y Liu, Y Cheng - … Surface Mesh Discrete Schemes for 2d … - papers.ssrn.com
In this work, we propose the finite element method (FEM) coupled implicit/explicit time
difference schemes for the two-dimensional three-component (2D-3C) shallow shell surface …

From DPG to mixed FEM

C Carstensen, T Führer, N Heuer - BOOK OF - ci2ma.udec.cl
Since its start more than a decade ago [2, 3], the discontinuous Petrov–Galerkin (DPG)
method with optimal test functions has itself established as a well-understood and useful …

DPG APPROACH FOR DEALING WITH STRESS CONCENTRATIONS

T FÜHRER, N HEUER, AH NIEMI - minres.mat.uc.cl
Stress concentrations may occur in structural engineering eg in the vicinity of concentrated
loads, abrupt transitions between materials or sharp re-entrant corners. Whether the local …