TDNNS mixed finite elements for solids and shells

Joachim Schöberl
TU Wien

joint work with Astrid Pechstein, Johannes Kepler University Linz
Michael Neunteufel, Portland State University

Modern Finite Element Technologies 2025, Aachen, Aug 20-22

This presentation uses the open-source finite element library NGSolve (www.ngsolve.org) within Jupyter Notebooks.

The talk is available online from https://jschoeberl.github.io/talk-pdesoft

** QR-code **

Solids:

• First examples

Structures:

• Hellan Herrman Johnson methods

• Reissner-Mindlin plate

• Naghdi shell

• Nonlinear Shell

• Sydney

If you like to try out this talk on your computer:

python3 -m pip install numpy scipy matplotlib ipywidgets jupyter notebook 
python3 -m pip install --upgrade ngsolve webgui_jupyter_widgets

Download notebooks from the jupyter-book, and run them like

jupyter-notebook elasticity3D.ipynb

If local installation fails, you may use our jupyterhub:

jupyterhub.cerbsim.com

user: ngshub_xx
pwd: solve!xx

xx = choose a number: 01 to 31

(pick the day of month of your birthday)

You find the notebooks in the shared/talk-LLNL folder.

Some more online material:

• NGSolve tutorials

• NGSolve-based finite element class

• NGSolve24 tutorials