Talk on Parallel-in-Time Integration with PFASST by Robert Speck

Dr. Robert Speck, Forschungszentrum Juelich talks on 30 Jan 2017, 16:15–17:45 in S2|17-103 on Parallel-in-Time Integration with PFASST: For time-dependent partial differential equations, parallel-in-time integration using the “parallel full approximation scheme in space and time” (PFASST) is a promising way to accelerate existing space-parallel approaches beyond their scaling limits. Inspired by the classical Parareal method and non-linear multigrid ideas, PFASST allows to integrate … Continue reading →

New building for our institute TEMF

Our institute “Theorie elektromagnetischer Felder” will move in the near future to a new building thanks to the gracious donation of Thomas Weiland:

J. Prömel & T. Weiland, source: tu-darmstadt.de, P. Glogowski

Professor Dr.-Ing. Thomas Weiland, seit 1989 Professor an der TU Darmstadt und langjähriger Leiter des Instituts Theorie Elektromagnetischer Felder, spendet der TU Darmstadt einen Millionenbetrag für den Bau eines neuen Institutsgebäudes im Zentrum der Stadt. TU-Präsident Professor Hans Jürgen Prömel äußerte großen Dank und Respekt angesichts der großzügigen Zuwendung. Continue reading →

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 →