References of "Geuzaine, Christophe"
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See detailSurface-Impedance Boundary Conditions in Dual Time-Domain Finite-Element Formulations
V Sabariego, Ruth ULg; Dular, Patrick ULg; Geuzaine, Christophe ULg et al

in Proceedings of the 17th Conference on the Computation of Electromagnetic Fields, COMPUMAG 2009 (2009, November)

This paper deals with time-domain surface-impedance boundary conditions in computational magnetodynamics considering both magnetic-vector potential and magnetic-field formulation. Based on the resolution ... [more ▼]

This paper deals with time-domain surface-impedance boundary conditions in computational magnetodynamics considering both magnetic-vector potential and magnetic-field formulation. Based on the resolution of the 1-D eddy-current problem in a semi-infinite slab, the massive conducting region is accounted for by choosing a number of exponentially decreasing trigonometric basis functions covering the relevant frequency range. Herein the method is elaborated for the magnetic-field formulation. Results for both formulations are compared and validated on a two-dimensional test case. [less ▲]

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See detailSome issues related to unstructured mesh generation
Compère, G.; Remacle, J.-F.; Marchandise, E. et al

in Proceedings of Current and New Trends in Scientific Computing, CMM-DIM 2009 (2009, October)

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See detailThree beneficiaries of project-oriented education in power electronics
Plumier, Frédéric ULg; Geuzaine, Christophe ULg

in Proceedings of the 13th European Conference on Power Electronics and Applications (2009, September)

Power Electronics education at the University of Liège exhibits a particular feature, in that a person from industry is directly involved in the teaching of the introductory Power Electronics course since ... [more ▼]

Power Electronics education at the University of Liège exhibits a particular feature, in that a person from industry is directly involved in the teaching of the introductory Power Electronics course since academic year 2007-2008. Together with him, we teach this subject making use of a project-oriented method. After two years of this experience, it is now of great interest to analyze the main benefits of this method for the students, the teaching team at the University and the company involved in the teaching process. In this paper we present through an example the method that is being used. We mention some interesting technical problems encountered by the students during their project work. We also present the evolution of the method from the first year of application in 2007-2008 to the forthcoming third year in 2009-2010. [less ▲]

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See detailGmsh
Geuzaine, Christophe ULg; Remacle, J.-F.

Scientific conference (2009, June 09)

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See detailNumerical simulation of the magnetization of high-temperature superconductors: a 3D finite element method using a single time-step iteration
Lousberg, Grégory ULg; Ausloos, Marcel ULg; Geuzaine, Christophe ULg et al

in Superconductor Science and Technology (2009), 22

In this paper, we report progress towards a 3D finite element model for the magnetization of a high-temperature superconductor (HTS): we suggest a method that takes into account a power law conductivity ... [more ▼]

In this paper, we report progress towards a 3D finite element model for the magnetization of a high-temperature superconductor (HTS): we suggest a method that takes into account a power law conductivity and demagnetization effects, while neglecting the effects associated with currents that are not perpendicular to the local magnetic induction. We consider samples that are subjected to a uniform magnetic field varying linearly with time. Their magnetization is calculated by means of a weak formulation in the magnetostatic approximation of the Maxwell equations (A–φ formulation). An implicit method is used for the temporal resolution (backward Euler scheme) and is solved with the open source solver GetDP. Fixed point iterations are used to deal with the power law conductivity of HTS. The finite element formulation is validated for an HTS tube with large n value by comparing with results obtained with other well-established methods. We show that carrying out the calculations with a single time-step (as opposed to many small time-steps) produces results with excellent accuracy in a drastically reduced simulation time. The numerical method is extended to the study of the trapped magnetization of cylinders that are drilled with different arrays of columnar holes arranged parallel to the cylinder axis. [less ▲]

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See detailAdvances in Convergent High-Frequency Scattering Solvers
Geuzaine, Christophe ULg

Scientific conference (2009, April 02)

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See detailNonlinear time-domain finite-element modeling of thin electromagnetic shells
V Sabariego, Ruth ULg; Geuzaine, Christophe ULg; Dular, Patrick ULg et al

in IEEE Transactions on Magnetics (2009), 45(3), 976-979

A nonlinear time-domain extension of the classical linear frequency-domain thin-shell approach is presented. The interface conditions are expressed in terms of the average magnetic flux density throughout ... [more ▼]

A nonlinear time-domain extension of the classical linear frequency-domain thin-shell approach is presented. The interface conditions are expressed in terms of the average magnetic flux density throughout the shell thickness and a number of higher order components. The method is elaborated in the frame of the magnetic vector potential formulation. The nonlinear system of algebraic equations is solved by means of the Newton–Raphson scheme. To validate the new formulation, we consider a magnetic plate placed above a double line carrying a sinusoidal current. Results are compared with those obtained with a fine finite-element model. [less ▲]

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See detailSurface-impedance boundary conditions in time-domain finite-element calculations
Gyselinck, Johan; Geuzaine, Christophe ULg; Dular, Patrick ULg et al

in IEEE Transactions on Magnetics (2009), 45(3), 1280-1283

The authors propose a novel time-domain extension of the well-known frequency-domain surface-impedance method in computational magnetodynamics. Herein, the 1-D eddy-current problem in a massive conducting ... [more ▼]

The authors propose a novel time-domain extension of the well-known frequency-domain surface-impedance method in computational magnetodynamics. Herein, the 1-D eddy-current problem in a massive conducting region (semi-infinite slab) is considered via a number of exponentially decreasing trigonometric basis functions that cover the relevant skin-depth (or frequency) range of the application at hand. The method is elaborated for the 3-D magnetic-vector-potential formulation and is applied to a simple 2-D test case. Results are shown to converge well to those obtained with an accurate brute-force finite-element (FE) model. [less ▲]

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See detailGeometry module for next-generation computational electromagnetics software
Geuzaine, Christophe ULg

in Proceedings of the 4th Advanced Computational Electromagnetics workshop (2009, January 13)

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See detailFinite-Element Analysis of a Shielded Pulsed-Current Induction Heater-- Experimental Validation of a Time-Domain Thin-Shell Approach
V Sabariego, Ruth ULg; Sergeant, Peter; Gyselink, Johan et al

in Proceedings of the 8th International Symposium on Electric and Magnetic Fields (EMF2009) (2009)

A time-domain extension of the classical frequency-domain thin-shell approach is used for the finite-element analysis of a shielded pulse-current induction heater. The time-domain interface conditions at ... [more ▼]

A time-domain extension of the classical frequency-domain thin-shell approach is used for the finite-element analysis of a shielded pulse-current induction heater. The time-domain interface conditions at the shell surface are expressed in terms of the average (zero-order) instantaneous flux and current density vectors in the shell, as well as in terms of a limited number of higher-order components. The three-dimensional thin-shell model is validated by comparing the numerical results with measurements performed on the heating device at different working frequencies. [less ▲]

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See detailAnalysis of perforated magnetic shields for electric power applications
Sergeant, Peter; V Sabariego, Ruth ULg; Crevecoeur, Guillaume et al

in IET Electric Power Applications (2009), 3(2), 123-132

The shielding performance of perforated magnetic shields for electric power applications is described. The shielding of an axisymmetric induction heating device is studied as a function of frequency ... [more ▼]

The shielding performance of perforated magnetic shields for electric power applications is described. The shielding of an axisymmetric induction heating device is studied as a function of frequency, number of perforations and dimensions of the perforations. From the numerical point of view, the perforations cause the numerical model to be 3D. A numerical optimisation is carried out to find the optimal geometry with respect to the shielding factor and the volume of the shield. For the optimisation, two approaches are presented. The first approach is fast and easy-to-implement, but has limited accuracy. It uses a classical 2D axisymmetric model where the perforations are approximated by ‘axisymmetric air gaps’ resulting in a segmented shield. It is shown how to modify the 2D model to obtain results that are similar to the ones of a 3D model. The second approach is more accurate although quite fast, but more difficult to implement. It combines a 3D thin- shell finite element model with the unmodified 2D model in a space mapping optimisation algorithm. The validation of both models is based on experimental work for an unperforated shield and for the optimised perforated shield. [less ▲]

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See detailIterative finite element solution of multiple-scattering problems at high frequencies
Geuzaine, Christophe ULg; Dular, Patrick ULg; Gaignaire, R. et al

in Proceedings of the 8th International Symposium on Electric and Magnetic Fields (EMF'2009) (2009)

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See detailDirect Inclusion of Proximity-Effect Losses in Two-Dimensional Time-Domain Finite-Element Simulation of Electrical Machines
Gyselinck, Johan; Dular, Patrick ULg; Geuzaine, Christophe ULg et al

in Proceedings of the 8th International Symposium on Electric and Magnetic Fields (EMF2009) (2009)

This paper deals with eddy-current effects in the distributed winding of electrical machines, and in particular with the proximity effect and the associated losses. A previously proposed homogenization ... [more ▼]

This paper deals with eddy-current effects in the distributed winding of electrical machines, and in particular with the proximity effect and the associated losses. A previously proposed homogenization method for windings in two-dimensional (2D) time-domain finite-element (FE) models is shown to be applicable without additional computational cost, producing a precise estimate of the instantaneous proximity-effect losses. The method is illustrated by considering the conductors in a single stator slot of a 3kW induction motor. The brute-force model, with fine discretisation of each conductor, and the homogenized model yield macroscopic results that are very close to each other. [less ▲]

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See detailCollaboration industrielle et enseignement par projet en électronique de puissance
Plumier, Frédéric ULg; Bleus, Paul; Geuzaine, Christophe ULg

in J3eA : Journal sur l'Enseignement des Sciences et Technologies de l'Information et des Systèmes (2009), 8(Hors série 1), 1015

For the first time during year 2007-2008, a complete design of a DC/DC converter, based on specifications only, was asked to the students following the basic Power Electronics course at University of ... [more ▼]

For the first time during year 2007-2008, a complete design of a DC/DC converter, based on specifications only, was asked to the students following the basic Power Electronics course at University of Liège. This very realistic pedagogical way of teaching helped the students to be autonomous, to learn project and team work. [less ▲]

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See detailDual Approach for Electromechanical Coupling in MEMS
Rochus, Véronique ULg; Golinval, Jean-Claude ULg; Geuzaine, Christophe ULg

(2009)

In this paper we present an approach for the computation of coupled electromechanical problems in micro-electromechanical systems based on a vector potential formulation of the electrostatic problem. This ... [more ▼]

In this paper we present an approach for the computation of coupled electromechanical problems in micro-electromechanical systems based on a vector potential formulation of the electrostatic problem. This formulation is the dual of the scalar potential approach commonly used in the literature. We present an analytic derivation of the force computed using this dual method based on the virtual work principle, and compare the primal and dual approaches on the finite element solution of simple twodimensional test-cases. [less ▲]

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See detailMasking with Generalized Cloaking
Nicolet, A.; Zolla, F.; Geuzaine, Christophe ULg

in Invited lecture, 17th Conference on the Computation of Electromagnetic Fields, COMPUMAG 2009 (2009)

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See detailHigh quality meshing based on harmonic mappings for biomedical simulation
Remacle, J.-F.; Marchandise, E.; Willemet, M. et al

in Proceedings of the 1st International Conference on Mathematical and Computational Biomedical Engineering (CMBE2009) (2009)

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See detailIntegral equation methods for the Helmholtz problem with a random impedance condition
Gaignaire, R.; Geuzaine, Christophe ULg

in Proceedings of the 9th International Conference on Mathematical and Numerical Aspects of Waves, Waves 2009 (2009)

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See detailGmsh: a three-dimensional finite element mesh generator with built-in pre- and post-processing facilities
Remacle, J.-F.; Geuzaine, Christophe ULg

in Proceedings of the 11th International Society of Grid Generation Conference (ISSG 2009) (2009)

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See detailCurvilinear mesh generation for CFD
Remacle, J.-F.; Geuzaine, Christophe ULg; Hillewaert, K.

in Proceedings of the International Conference on Spectral and High Order Methods (ICOSAHOM 2009) (2009)

Detailed reference viewed: 60 (1 ULg)