61 citations · 329 across the 55 of their papers we have counts for
20 papers · 1 filter
Efficient Pareto-Front Generation for Electric Machines using IGA and Second Order Derivatives
Theodor Komann, Michael Wiesheu, Stefan Ulbrich +2
The multiobjective optimization of electric machines always involves a trade-off caused by various competing objectives such as performance and cost. A suitable design is usually d…
A Comparison of Multirate Co-Simulation Techniques for Field-Circuit Coupled Problems
Michael Wiesheu, Sebastian Schöps, Idoia Cortes Garcia
This paper compares three different multirate splitting approaches for the application on field-circuit coupled magnetoquasistatic simulations. For these methods, again three diffe…
An Air-Gap Element for the Isogeometric Space-Time-Simulation of Electric Machines
Michael Reichelt, Michael Wiesheu, Melina Merkel +2
Space-time methods promise more efficient time-domain simulations, in particular of electrical machines. However, most approaches require the motion to be known in advance so that…
Shape uncertainty quantification of Maxwell eigenvalues and -modes with application to TESLA cavities
Jürgen Dölz, David Ebert, Sebastian Schöps +1
We consider Maxwell eigenvalue problems on uncertain shapes with perfectly conducting TESLA cavities being the driving example. Due to the shape uncertainty the resulting eigenvalu…
Parareal for Higher Index Differential Algebraic Equations
Idoia Cortes Garcia, Iryna Kulchytska-Ruchka, Sebastian Schöps
This article proposes modifications of the Parareal algorithm for its application to higher index differential algebraic equations (DAEs). It is based on the idea of applying the a…
On the stability of harmonic mortar methods with application to electric machines
Herbert Egger, Mané Harutyunyan, Melina Merkel +1
Harmonic stator-rotor coupling offers a promising approach for the interconnection of rotating subsystems in the simulation of electric machines. This paper studies the stability o…
Multigrid-reduction-in-time for Eddy Current problems
Stephanie Friedhoff, Jens Hahne, Sebastian Schöps
Parallel-in-time methods have shown success for reducing the simulation time of many time-dependent problems. Here, we consider applying the multigrid-reduction-in-time (MGRIT) alg…
Exploring Parallel-in-Time Approaches for Eddy Current Problems
Stephanie Friedhoff, Jens Hahne, Iryna Kulchytska-Ruchka +1
We consider the usage of parallel-in-time algorithms of the Parareal and multigrid-reduction-in-time (MGRIT) methodologies for the parallel-in-time solution of the eddy current pro…
A New Parareal Algorithm for Time-Periodic Problems with Discontinuous Inputs
Martin J. Gander, Iryna Kulchytska-Ruchka, Sebastian Schöps
The Parareal algorithm, which is related to multiple shooting, was introduced for solving evolution problems in a time-parallel manner. The algorithm was then extended to solve tim…
Sparse Representations for Uncertainty Quantification of a Coupled Field-Circuit Problem
Roland Pulch, Sebastian Schöps
We consider a model of an electric circuit, where differential algebraic equations for a circuit part are coupled to partial differential equations for an electromagnetic field par…
Systems of Differential Algebraic Equations in Computational Electromagnetics
Idoia Cortes Garcia, Sebastian Schöps, Herbert De Gersem +1
Starting from space-discretisation of Maxwell's equations, various classical formulations are proposed for the simulation of electromagnetic fields. They differ in the phenomena co…
A Structural Analysis of Field/Circuit Coupled Problems Based on a Generalised Circuit Element
Idoia Cortes Garcia, Herbert De Gersem, Sebastian Schöps
In some applications there arises the need of a spatially distributed description of a physical quantity inside a device coupled to a circuit. Then, the in-space discretised system…
Isogeometric Analysis and Harmonic Stator-Rotor Coupling for Simulating Electric Machines
Zeger Bontinck, Jacopo Corno, Sebastian Schöps +1
This work proposes Isogeometric Analysis as an alternative to classical finite elements for simulating electric machines. Through the spline-based Isogeometric discretization it is…
A Fast Isogeometric BEM for the Three Dimensional Laplace- and Helmholtz Problems
Jürgen Dölz, Helmut Harbrecht, Stefan Kurz +2
We present an indirect higher order boundary element method utilising NURBS mappings for exact geometry representation and an interpolation-based fast multipole method for compress…
ParaExp using Leapfrog as Integrator for High-Frequency Electromagnetic Simulations
Melina Merkel, Innocent Niyonzima, Sebastian Schöps
Recently, ParaExp was proposed for the time integration of linear hyperbolic problems. It splits the time interval of interest into sub-intervals and computes the solution on each…
Model Order Reduction for Rotating Electrical Machines
Zeger Bontinck, Oliver Lass, Sebastian Schöps +1
The simulation of electric rotating machines is both computationally expensive and memory intensive. To overcome these costs, model order reduction techniques can be applied. The f…
A Defect Corrected Finite Element Approach for the Accurate Evaluation of Magnetic Fields on Unstructured Grids
Ulrich Römer, Sebastian Schöps, Herbert De Gersem
In electromagnetic simulations of magnets and machines one is often interested in a highly accurate and local evaluation of the magnetic field uniformity. Based on local post-proce…
Waveform Relaxation for the Computational Homogenization of Multiscale Magnetoquasistatic Problems
Innocent Niyonzima, Christophe Geuzaine, Sebastian Schöps
This paper proposes the application of the waveform relaxation method to the homogenization of multiscale magnetoquasistatic problems. In the monolithic heterogeneous multiscale me…
Isogeometric Simulation of Lorentz Detuning in Superconducting Accelerator Cavities
Jacopo Corno, Carlo de Falco, Herbert De Gersem +1
Cavities in linear accelerators suffer from eigenfrequency shifts due to mechanical deformation caused by the electromagnetic radiation pressure, a phenomenon known as Lorentz detu…
Stochastic Modeling and Regularity of the Nonlinear Elliptic Curl-Curl Equation
Ulrich Römer, Sebastian Schöps, Thomas Weiland
This paper addresses the nonlinear elliptic curl-curl equation with uncertainties in the material law. It is frequently employed in the numerical evaluation of magnetostatic fields…