Today was the last day of the 16th European Conference on Mathematics for Industry that took place in the Historische Stadthalle in Wuppertal. As a member of the working group of applied math and numerical anaylsis, I was part of the local organizing committee.
I gave a talk in the minisymposium on Electromagnetic Field Computation about fitting reduced order models in magnetoquasistatic field problems (similarly to the talk in Essen) but also on the converegence of the scheme (slides 13ff).
Continue reading ‘ECMI 2010 is over’ Today was the last day of the 16th European Conference on Mathematics for Industry that took place in the Historische Stadthalle in Wuppertal. As a member of the working group of applied math and numerical anaylsis, I was part of the local organizing committee.
I gave a talk in the minisymposium on Electromagnetic Field Computation about fitting reduced order models in magnetoquasistatic field problems (similarly to the talk in Essen) but also on the converegence of the scheme (slides 13ff).
Continue reading ‘ECMI 2010 is over’ Next term the chair of numercial analysis, Bergische Universität Wuppertal, offers a lecture on Computational Magnetics. The aim is to develop an Octave software package to simulate magnetoquasistatic fields.
All the typical tasks of applied mathematics will be covered: modeling, software design, coding, testing, simulation und visualization.
The Symposium on Electromagnetic Phenomena in Nonlinear Circuits (EPNC) 2010 was this year in Essen. – A stone’s throw from Wuppertal. I gave another talk on co-simulation. Here the method was applied to an induction motor, as shown in the figure on the right. The coupling is given by extracted inductances, similarily to the method presented at the Compumag 2009. This time the focus was on signal processing; the waveforms are smoothed to allow for large time steps.
Currently there is no recent octave package for openSUSE, so I decided to compile it
by myself, but due to dependencies this was a rather difficult task. I
succeeded by applying the following steps for Octave 3.2.3 on openSUSE 11.2.
My institute organizes from July 26-30, 2010 the next European Conference on Mathematics for Industry (ECMI). The conference is following up ECMI – 2008 in London, UK. As all ECMI conferences, ECMI 2010 will emphasize the role of mathematics as a unique overarching industrial resource.
The registration is open from January, 10th.
I attended to the Compumag 2009 in Florianópolis supported by a travel grant from the DAAD (German Academic Exchange Service). At the conference I showed a nice application of my latest research on co-simulation (together with Andreas Bartel and Herbert De Gersem). The theory is based on the work of Arnold/Günther: “Preconditioned dynamic iteration for coupled differential-algebraic systems” – BIT Numerical Mathematics.
The given application is a multirate framework for the efficient simulation of field/circuit coupled problems. Within this framework, a guarantee for convergence and stability was given by PDAE analysis. It was shown that different time step sizes in different parts of the model can be automatically chosen according to the problem’s dynamics. Finally a finite element model of a transformer coupled to a circuit was given to illustrate the efficiency of the multirate method.
The talk was awarded with a COMPUMAG best paper commendation.
Continue reading ‘Compumag 2009, Florianópolis’
Starting in May 2009 I will move for longer periods to Kortrijk to do research at the University of Leuven, supported by a one-year research grant from the DAAD (German Academic Exchange Service).
I have written a simulation package FIDES to test multi rate time integration in coupled electromagnetic field and electric circruit equations. The package is part of the COMSON Demonstrator Platform, using OCTAVE as its interpreter.
Recently I wanted to visualize my results. I used ffmpeg to produce a movie from several plots of the flux distribution inside a transformer.
I’m back from the SCEE 2008 (Scientific Computing in Electrical Engineering) Conference in Espoo, Finland.The picture on the left is given to illustrate my coupling approach during my talk about circuits refined by 3-D conductor models. The circuit is given in terms of the modified nodal analysis and the field is discretized by the finite integration technique. The coupled system is introduced and analyzed; numerical results are obtained by co-simulation (“weak coupling”) and monolithic coupling (“strong”). The basic ideas are taken from my thesis, but there are new additional theoretical and numerical results.
Continue reading ‘SCEE in Finland’
This is my thesis on computational electromagnetics, from the abstract:
Continue reading ‘Master-Thesis’
Electric circuits contain devices that exhibit multi-physical effects. We may think of electric or magnetic, but also thermal effects. Traditionally these devices are idealized and only one effect is considered, while the others are disregarded. This yields simple laws that mathematically express their transient behaviour, but does not conform to reality. So sometimes these models are not accurate enough and one wants to simulate a particular device with a refined model. We shall present such a refined modelling approach for electromagnetic devices in this treatise.
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