Foto von der Digital Humanities Cooperation (@DHCooperation)
Einige Eindrücke von der Podiumsdiskussion zu Digitalität in Wissenschaft und Gesellschaft
The International Symposium on Electric and Magnetic Fields 2018 is over
The 11th International Symposium on Electric and Magnetic Fields, EMF 2018, was hosted in Darmstadt and concluded on Friday. The purpose of the Symposium was to throw a bridge between recent research advances in mathematical and numerical modelling of electromagnetic fields and the growing number of industrial problems requiring such techniques. There were 95 participants from 19 countries and 3 invited talks. The participants gave 26 oral presentations, presented 53 posters and drank 700 cups of coffee. Already these numbers imply that the conference was a great success. Now, we are looking forward to meet our colleagues in Marseille for the next edition organized by André Nicolet and co-workers. A New Parareal Algorithm for Problems with Discontinuous Sources
We recently proposed a new Parareal algorithm for problems with discontinuous sources which are common in electrical engineering, e.g., when an electric device is supplied with a pulse-width-modulated signal. Our algorithm uses a smooth input for the coarse problem with reduced dynamics. In the new arXiv preprint 1803.05503 preprint an error estimates is derived that shows how the input reduction influences the overall convergence rate of the algorithm. The theoretical results are supported by numerical experiments, including an eddy current simulation of an induction machine. Diskussionsrunde an der TU im Rahmen von „March for Science 2018“
Die TU beteiligt sich am March for Science 2018. Bild: Patrick Bal
Pressemitteilung zu PASIROM
Die technische Universität Darmstadt hat eine Pressemitteilung zu PASIROM veröffentlicht: Forschungsprojekt von Universitäten und Industriepartnern gestartet. Mit mathematischen Methoden das optimale Design für Energiewandler finden: Dieser Aufgabe widmet sich das gerade gestartete Forschungsprojekt PASIROM, an dem drei Universitäten und zwei Anwendungspartner beteiligt sind. Continue reading → New paper on MOR for nonlinear problems
Under the doi 10.3390/mca23010008 Felix Fritzen, Bernard Haasdonk, David Ryckelynck any myself have published a new paper on an algorithmic discussion of competing parametric model reduction techniques for nonlinear problems in Mathematical and Computational Applications. The Galerkin reduced basis (RB) formulation is presented, which fails at providing significant gains with respect to the computational efficiency for nonlinear problems. Renowned methods for the reduction of the computing time of nonlinear reduced order models are investigated. All approaches are applied to a simple uncertainty quantification of a planar nonlinear thermal conduction problem. The paper is free under CC BY 4.0. New paper on isogeometric analysis of electrical machines
Computer Methods in Applied Mechanics and Engineering has accepted our paper on Isogeometric analysis and harmonic stator–rotor coupling for simulating electric machines with DOI 10.1016/j.cma.2018.01.047. The paper proposes Isogeometric Analysis as an alternative to classical finite elements for simulating electric machines. Through the spline-based discretisation it is possible to parametrise the circular arcs exactly, thereby avoiding any geometrical error in the representation of the air gap where a high accuracy is mandatory.
Update: get the paper for free before April 10, 2018 at authors.elsevier.com.
How to compile GNU Octave with OpenBLAS on macOS
The repository homebrew/science is dead, long live dpo/homebrew-openblas! We switched from Apples proprietary Accelerate framework to OpenBLAS, so free your numbers and compile Octave as follows
brew tap dpo/openblasPin the repository
brew tap-pin dpo/openblasNow, install a development snapshot of octave (with GUI and java)
brew install dpo/openblas/octave --devel --with-qt --with-javaMacOS and Linux users with HiDPI screen will enjoy improved plotting thanks to the fixes of jpswensen for bug #49053.
DFG genehmigt ParaMQS2
Die DFG hat den Fortsetzungsantrag ParaMQS2 – Parallele und explizite Verfahren für die Simulation von Wirbelstromproblemen (SCHO1562/1-2) genehmigt. Es setzt die in Sachmittelbeihilfen CL14311-1 und SCHO1562/1-1 geförderten Vorarbeiten fort. Ziel des Forschungsvorhabens ist es numerisch effiziente parallele Algorithmen für die Berechnung von Wirbelstromproblemen zu entwickeln, die besonders gut geeignet sind für aktuelle heterogene, massiv parallele Rechnerarchitekturen. Da konventionelle implizite und neu entwickelte (semi-)explizite Zeitintegrationsverfahren für magnetoquasistatische Probleme ab einer gewissen Anzahl von Rechenkernen nicht mehr gut skalieren, sollen in diesem Forschungsvorhaben auch zeitparallele Algorithmen eingesetzt werden.
Nachtrag vom 10.2.2018: Pressemitteilung der Bergischen Universität Wuppertal unter https://www.presse.uni-wuppertal.de
Recent Advances on Multiphysics Simulation of Accelerator Magnets within STEAM at CERN
New papers from the STEAM collaboration with CERN, presented at the 25th International Conference on Magnet Technology have been accepted for publication by IEEE
- Bortot, Lorenzo et al. STEAM: A Hierarchical Co-Simulation Framework for Superconducting Accelerator Magnet Circuits.. In: IEEE Transactions on Applied Superconductivity, 28 (3) ISSN 1051-8223, DOI: 10.1109/TASC.2017.2787665, 2018.
- Maciejewski, Michał et al. Coupling of Magneto-Thermal and Mechanical Superconducting Magnet Models by Means of Mesh-Based Interpolation.. In: IEEE Transactions on Applied Superconductivity, 28 (3) ISSN 1051-8223, DOI: 10.1109/TASC.2017.2786721, 2018.