Octave 3.4.2 on openSUSE 11.4

Published on 22. August 2011 in Computer, Mathematics and Software. 1 Comment Tags: , , , .

Finally, the science repository for openSUSE comes with a recent Octave version that supports UMFPACK. Add the corresponding repository

sudo zypper ar http://download.opensuse.org/repositories/science/openSUSE_Tumbleweed/ opensuse:science

and install the package

sudo zypper in octave

You verify that UMFPACK works by the following computation

A=sprandsym(1000,0.01)+eye(1000);b=rand(1000,1);norm(A*(A\b)-b)

which solves a linear system with a sparse symmetric positive definite system matrix A and prints the residual to the console.

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Out of Office

Published on 24. July 2011 in General. Closed Tags: , .
20110730-011321.jpg

I am on vacation in Sønder Stenderup, Denmark: great weather, a nice beach and the sea.

Back on August, 8th.

BMBF Sofa Kopplungsworkshop

Published on 20. June 2011 in Conferences, Engineering and Mathematics. Closed Tags: , , , , , .

Die Arbeitsgruppe für Angewandte Mathematik und Numerische Analysis an der Bergischen Universität Wuppertal veranstaltet am 1. Juli 2011, 13:00 – 16:00 im Rahmen des BMBF-Verbundprojekts SOFA (Gekoppelte Simulation und Optimierung für robustes virtuelles Fahrzeugdesign) einen Kopplungsworkshop. Herzlich eingeladen sind auch alle interessierten Studenten, Mitarbeiter und Industriepartner, die nicht zum Projekt gehören.

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Promotion

Published on 24. May 2011 in Mathematics. Closed Tags: , , , , .
I successfully defended my doctorate on “Multiscale Modeling and Multirate Time-Integration of Field/Circuit Coupled Problems” last Friday.

Update: The thesis is published in the subseries on electromagnetism of the Fortschritt-Berichte VDI and on the e-publication server of the Bergische Universität Wuppertal.

WPSP-Seminar at K.U. Leuven

Published on 6. May 2011 in General. Closed
I will present the results of my Ph.D.-thesis on Monday, May 16th 2011, 14:00 at the Katholieke Universiteit Leuven Campus Kortrijk.
The talk deals with multiscale models from electrical engineering, i.e., the electric network, the magnetoquasistaic field device and the drift-diffusion model of a semiconductor. Their structure, coupling and DAE-index are analyzed and furthermore multirate time-integration methods for the coupled problem are discussed. This is in particular the multirate Schur complement with an energy-based update scheme and the dynamic iteration approach. It will be shown by numerical examples that their application reduces significantly the computational costs in coupled simulations compared to the standard single-rate approach.

SOFA Project Meeting

Published on 5. May 2011 in General. Closed
Below the slides and videos prepared for the SOFA Meeting, May 2011 (work packages AP1-AP3).
  • coupling, software design goals and implementation (slides)
  • field/circuit coupled simulation using a 2D FEM MQS device model (video)
  • field/circuit coupled simulation using a 3D FIT MQS device model (video)

Submission of Dissertation

Published on 3. May 2011 in General. Closed

My Dissertation “Multiscale Modeling and Multirate Time-Integration of Field/Circuit Coupled Problems” is now submitted at the B.U. Wuppertal and K.U. Leuven. The defense is on May, 20th.

Official Announcement of K.U. Leuven.

Seminar Talk: Higher Order Cosimulation

Published on 14. December 2010 in General, Leuven and Mathematics. Closed Tags: , , .

I give a seminar talk on Tuesday, 14 Dec 2010, 11:00-12:00 at K.U.Leuven, Dep. Computer Science, Celestijnenlaan 200A, lecture room 05.001.

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International Multi-Scale Workshop

Published on 11. December 2010 in Conferences and Engineering. Closed Tags: , , .
CE School

CE School

I just came back from the “International Multi-Scale Workshop 2010″ in Darmstadt. I gave an invited talk on co-simulation (convergence of dynamic iteration schemes).

You can find the abstract of my talk and more information at the website of the Graduate School of Computational Engineering, Darmstadt.

Relaunch of www-num

Published on 24. October 2010 in General and Mathematics. Closed Tags: , , .
AMNA LogoThe website of my working group at Wuppertal has been relaunched last week:

http://www-num.math.uni-wuppertal.de

Besides the new design we added brief descriptions of our research topics. For example I am involved in dynamic iteration, index analysis and multirate time-integration with applications in coupled electric network and electromagnetic field problems.