Winter excursion to GSI, Darmstadt

Today, computational engineering students and several colleagues from our work group of computational electromagnetics made an excursion to the GSI Helmholtzzentrum für Schwerionenforschung. We visited the ion sources, the linear accelerator, the control room and we had a look to the prototype of the Super-FRS Magnet of the FAIR project. Thanks to the GSI for the tour and the important research that you do!

Albert Ruehli is visiting Darmstadt

Dr. Albert Ruehli, life fellow of IEEE, adjunct professor at Missouri University and former IBM research staff member is visiting TU Darmstadt this week. He gives today an introductory talk in the undergraduate course “Elektromagnetisches CE” on the history of the modified nodal analysis and on the events that led to its development at IBM in the 70s. If you could not attend, you might want to look at this youtube video.

Octave 4.2 released

bildschirmfoto-2016-11-15-um-21-48-24Finally, GNU Octave 4.2 was released (also see the new shiny website). It comes with odeset, odeget and some odeXX compatible time steppers that have been developed with contributions within recent GSOC and SOCIS projects.

macOS users can get the release already today by using homebrew as usual

brew install octave

CEFC 2016 in Miami

cefc2016 The Seventeenth Biennial IEEE Conference on Electromagnetic Field Computation is currently held in Miami. We are contributing with two talks and three posters
  • A. Pels, R. Sabariego, S. Schöps – Solving Multirate Partial Differential Equations using hat Finite Element basis functions
  • U. Römer, C. Schmidt, U. Van Rienen, S. Schöps – Low-Dimensional Stochastic Modeling of the Electrical Properties of Biological Tissues (Preprint)
  • J. Dutiné, M. Clemens, S. Schöps – Multiple Right-Hand Side Techniques in Semi-Explicit Time Integration Methods for Transient Eddy Current Problems (Preprint)
  • M. Eller, S. Reitzinger, S. Schöps, S. Zaglmayr – A Reduced Basis Approach for Broadband Maxwell Simulations
  • I. Niyonzima, M. Clemens, S. Schöps – Investigation of the Time Integration Methods on the Parareal Method for Field Computation of Eddy Currents Problems

New paper on Waveform Relaxation for Multiscale Problems

jcp Our paper on Waveform Relaxation for the Computational Homogenization of Multiscale Magnetoquasistatic Problems (Innocent Niyonzima, Christophe Geuzaine, Sebastian Schöps) has been accepted by JCP:
This paper proposes the application of the waveform relaxation method to the homogenization of multiscale magnetoquasistatic problems. In the monolithic heterogeneous multiscale method, the nonlinear macroscale problem is solved using the Newton–Raphson scheme. The resolution of many mesoscale problems per Gauss point allows to compute the homogenized constitutive law and its derivative by finite differences. In the proposed approach, the macroscale problem and the mesoscale problems are weakly coupled and solved separately using the finite element method on time intervals for several waveform relaxation iterations. The exchange of information between both problems is still carried out using the heterogeneous multiscale method. However, the partial derivatives can now be evaluated exactly by solving only one mesoscale problem per Gauss point. Continue reading →

Workshop on Order-Reduction Methods 2016

worm2016 The 3rd International Workshop on Order-Reduction Methods for Mechanics of Materials (WORM 2016) took place from Aug 29th – Wed, Aug 31st, 2016 in Bad Herrenalb, Germany. We presented recent results on domain decomposition and model order reduction in the context of Isogeometric analysis (IGA); title: Towards Reduced Order Modelling of Resonant Cavities for Particle Accelerators discretized by IGA; authors: Corno, de Falco and Schöps.

EMTS 2016 is over

emtsURSI Commission B’s International Symposium on Electromagnetic Theory (EMTS 2016) has been held from 14–18 August 2016 in Espoo, Finland. We presented in the Session of numerical time domain methods on Monday the contribution “An Application of ParaExp to Electromagnetic Wave Problems” (Melina Merkel, Innocent Niyonzima and Sebastian Schöps).

Continue reading

How to build GNU Octave with Qt5 on the Mac

1503512The graphical user interface of Octave 4.0 can only be compiled with Qt4. Homebrew is dropping 4.x support and moving towards 5.x. Several Octave dependencies have already been updated (e.g. Qscintilla2, see e.g. this issue. However, the upcoming Octave 4.2 (release is scheduled for September 2016) will have full Qt5 as discussed here.

The standard installation uses the command line interface. If you need Octave with graphical user interface then this should work
brew update 
brew upgrade #to get the latest qscintilla
brew install octave --with-gui --HEAD
Update: The post has been edited on Aug 20 since the new formula is now available in homebrew’s science repository.