Showing results 61 to 80 of 292
 Electro-Mechano-Fluidic Modelling of Microsystems using Finite Elements; ; et al in Proceedings of the 18th Conference on the Computation of Electromagnetic Fields (COMPUMAG 2011) (2011, July) Detailed reference viewed: 6 (0 ULg)Discontinuous Galerkin Method for Computing Induced Fields in Superconducting Materials"; ; et al in Proceedings of the 18th Conference on the Computation of Electromagnetic Fields (COMPUMAG 2011) (2011, July) Detailed reference viewed: 6 (0 ULg) A Finite Element Subproblem Method for Position Change Conductor SystemsDular, Patrick  ; ; V Sabariego, Ruth et al(2011, July) Analyses of magnetic circuits with position changes of both massive and stranded conductors are performed via a finite element subproblem method. A complete problem is split into subproblems associated ... [more ▼] Analyses of magnetic circuits with position changes of both massive and stranded conductors are performed via a finite element subproblem method. A complete problem is split into subproblems associated with each conductor and the magnetic regions. Each complete solution is then expressed as the sum of subproblem solutions supported by different meshes. The subproblem procedure simplifies both meshing and solving processes, with no need of remeshing, and accurately quantifies the effect of the position changes of conductors on both local fields, e.g. skin and proximity effects, and global quantities, e.g. inductances and forces. Applications covering parameterized analyses on conductor positions to moving conductor systems benefit from the developed approach. [less ▲] Detailed reference viewed: 18 (4 ULg)Quality meshing algorithms for accurate and efficient cardiovascular simulations; ; et al in Nithiarasu, P.; Lohner, R. (Eds.) Procedings of the 2nd International Conference on Mathematical and Computational Biomedical Engineering (CMBE2011) (2011, April) Detailed reference viewed: 10 (0 ULg)Quality surface meshing using discrete parametrizations; ; et al in Proceedings of the 16th International Conference on Finite Elements in Flow Problems (FEF 2011) (2011, March) Detailed reference viewed: 7 (0 ULg)Blossom-Quad: a non-uniform quadrilateral mesh generator using a minimum cost perfect macthing algorithm; Geuzaine, Christophe ; in Wall, W. A.; Gravemeier, V. (Eds.) Proceedings of the 16th International Conference on Finite Elements in Flow Problems (FEF 2011) (2011, March) Detailed reference viewed: 8 (0 ULg)New Non-Overlapping Domain Decomposition Algorithm for the Helmholtz Equation; ; Geuzaine, Christophe in Proceedings of the 20th International Conference on Domain Decomposition Methods (DD20) (2011, February) Detailed reference viewed: 6 (0 ULg)Correction of Thin Shell Finite Element Magnetic Models via a Subproblem MethodDular, Patrick ; Dang, Quoc Vuong ; Vazquez Sabariego, Ruth et alin IEEE Transactions on Magnetics (2011), 47(5), 1158-1161 A subproblem finite-element method is developed for correcting the inaccuracies near edges and corners inherent to thin shell models, for both magnetostatic and magnetodynamic problems. A thin shell ... [more ▼] A subproblem finite-element method is developed for correcting the inaccuracies near edges and corners inherent to thin shell models, for both magnetostatic and magnetodynamic problems. A thin shell solution, supported by a simplified mesh near the thin structures, serves as a source of a correction problem with the actual volumic thin regions alone in a homogeneous medium, concentrating the meshing effort on the thin regions only. Improvements of local fields are efficiently achieved and allow accurate force and loss calculations. [less ▲] Detailed reference viewed: 20 (7 ULg)Finite Element Computational Homogenization of Nonlinear Multiscale Materials in MagnetostaticsNiyonzima, Innocent ; V Sabariego, Ruth ; Dular, Patrick et alin 18th Conference on the Computation of Electromagnetic Fields (COMPUMAG2011) (2011) This paper deals with the modelling of nonlinear multiscale materials in magnetostatics by means of a finite element computational homogenization method. The method couples a macroscale problem with many ... [more ▼] This paper deals with the modelling of nonlinear multiscale materials in magnetostatics by means of a finite element computational homogenization method. The method couples a macroscale problem with many microscale problems. During the upscaling step, the homogenized magnetic permeability and its derivative with respect to the magnetic field are calculated from the microscale solution and transferred to the macroscale. The downscaling step consists in imposing proper boundary conditions for the microscale problems from the macroscale solution. Results are validated by comparison with those obtained with classical finite element brute force approach. [less ▲] Detailed reference viewed: 74 (15 ULg)A Model Reduction Algorithm for Solving Multiple Scattering Problems Using Iterative MethodsVion, Alexandre ; Vazquez Sabariego, Ruth ; Geuzaine, Christophe in IEEE Transactions on Magnetics (2011), 47(5), 1470-1473 Detailed reference viewed: 11 (4 ULg)Refinement of Non-Linear Magnetic Models via a Finite Element Subproblem MethodDular, Patrick ; ; V Sabariego, Ruth et al(2011) Model refinements of non-linear magnetic circuits are performed via a finite element subproblem method. A com- plete problem is split into subproblems to allow a progression from 1-D to 3-D including ... [more ▼] Model refinements of non-linear magnetic circuits are performed via a finite element subproblem method. A com- plete problem is split into subproblems to allow a progression from 1-D to 3-D including linear to non-linear model corrections. Its solution is then expressed as the sum of the subproblem solu- tions supported by different meshes. A convenient and robust correction procedure is proposed allowing independent overlapping meshes for both source and reaction fields. It simplifies both meshing and solving processes, and quantifies the gain given by each refinement on both local fields and global quantities. [less ▲] Detailed reference viewed: 14 (3 ULg)Computation of induced fields into the human body by using dual formulations; V Sabariego, Ruth ; et al(2011) In this work we present the use of two dual formulations to compute Extremely Low frequency (ELF) induced fields into the human body. This allows to estimate the numerical error, as well as rigorously ... [more ▼] In this work we present the use of two dual formulations to compute Extremely Low frequency (ELF) induced fields into the human body. This allows to estimate the numerical error, as well as rigorously bound the (global) co-energy. This method is here applied to the classical case of the exposure to a homogeneous magnetic field. [less ▲] Detailed reference viewed: 13 (1 ULg)Numerical dosimetry of elf fields by using dual formulations; V Sabariego, Ruth ; Geuzaine, Christophe et alin Proceedings of 10th International Conference of the European Bioelectromagnetics Association (EBEA2011) (2011) Detailed reference viewed: 44 (7 ULg)Stochastic Uncertainty Quantification of Eddy Currents in the Human Body by Polynomial Chaos DecompositionGaignaire, Roman ; ; V Sabariego, Ruth et al(2011) The finite element method can be used to compute the electromagnetic fields induced into the human body by envi- ronmental extremely low frequency fields. However, the electric properties of tissues are ... [more ▼] The finite element method can be used to compute the electromagnetic fields induced into the human body by envi- ronmental extremely low frequency fields. However, the electric properties of tissues are not precisely known and may vary depending on the individual, his/her age and other physiological parameters. We propose to account for some uncertainties on the conductivities of the brain tissues and to spread them out to the induced fields by means of a non-intrusive approach based on the chaos Hermite polynomial with the finite element method as a black box [3], [4]. [less ▲] Detailed reference viewed: 21 (3 ULg)Time-Domain Surface Impedance Boundary Conditions Enhanced by Coarse Volume Finite-Element DiscretisationV Sabariego, Ruth ; Geuzaine, Christophe ; Dular, Patrick et al(2011) The time-domain surface impedance boundary conditions allow to accurately account for the high-frequency flux components while removing the massive conducting regions from the computation domain. In this ... [more ▼] The time-domain surface impedance boundary conditions allow to accurately account for the high-frequency flux components while removing the massive conducting regions from the computation domain. In this paper, a coarse volume finite-element discretization of the conductors together with a fictitious frequency-dependent conductivity are added to capture the slow varying flux components. This hybrid approach extends thus the frequency range of these impedance conditions. A 2-D test case illustrates the method. [less ▲] Detailed reference viewed: 19 (1 ULg)Considering Laminated Cores and Eddy Currents in 2D and 3D Finite Element Simulation of Electrical Machines; Geuzaine, Christophe ; V Sabariego, Ruth (2011) This paper deals with a time-domain homogeniza- tion method for laminated cores and its application to the 2D finite element simulation of rotating electrical machines. The number of additional degrees of ... [more ▼] This paper deals with a time-domain homogeniza- tion method for laminated cores and its application to the 2D finite element simulation of rotating electrical machines. The number of additional degrees of freedom of the model, for considering the variation of the flux density along the lamination thickness, can be tuned so as to reach a good compromise between accuracy and computation time. The results obtained for a switched reluctance motor agree very well with those produced by a precise full 3D model in which eddy currents are explicitly modeled. [less ▲] Detailed reference viewed: 30 (2 ULg)High Quality Surface Remeshing Using Harmonic Maps. Part II: Surfaces with High Genus and of Large Aspect Ratio; ; et al in International Journal for Numerical Methods in Engineering (2011), 86(11), 1303-1321 Detailed reference viewed: 26 (1 ULg)Quality open source mesh generation for cardiovascular flow simulations; ; Geuzaine, Christophe et alin Ambrosi, D.; Quarteroni, A.; Rozza, G. (Eds.) Modelling Physiological Flow (2011) Detailed reference viewed: 86 (3 ULg)Quasi-Optimal Convergence of Non Overlapping Domain Decomposition Method: the Helmholtz Equation; ; Geuzaine, Christophe in Proceedings of the AMS 2010 Fall Central Section Meeting (2010, November) Detailed reference viewed: 23 (1 ULg)High Quality Surface Remeshing Using Harmonic Maps: Surfaces with High Genus and of Large Aspect Ratio; Geuzaine, Christophe ; in Proceedings of the Third Workshop on Grid Generation for Numerical Computations, Tetrahedron III (2010, September) Detailed reference viewed: 14 (1 ULg) |
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