25 citations · 58 across the 13 of their papers we have counts for
14 papers
Simplification of the Isotropic Generalized Stop-Type Prandtl-Ishlinskii Vector Hysteresis Operator Using Analytical Return-Point Mapping
Arvinth Shankar, Klaus Kuhnen, Iryna Kulchytska-Ruchka +1
While the thermodynamically formulated generalized Prandtl-Ishlinskii stop-type operator effectively captures hysteresis nonlinearities, it requires a local iterative procedure to…
Accelerating Industrial Finite Element Simulations of Electric Machines based on Runtime Analysis
Arvinth Shankar, Iryna Kulchytska-Ruchka, Sebastian Schöps
The simulation of electric machines plays a significant role in the design of efficient and competitive products. Faster simulations reduce computational costs, such as CPU hours,…
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…
Parallel-in-Time Solution of Eddy Current Problems Using Implicit and Explicit Time-stepping Methods
Idoia Cortes Garcia, Iryna Kulchytska-Ruchka, Markus Clemens +1
The time domain analysis of eddy current problems often requires the simulation of long time intervals, e.g. until a steady state is reached. Fast-switching excitations e.g. in pul…
Parallel-in-Time Simulation of Power Converters Using Multirate PDEs
Andreas Pels, Iryna Kulchytska-Ruchka, Sebastian Schöps
This paper presents an efficient numerical algorithm for the simulation of pulse-width modulated power converters via parallelization in time domain. The method applies the multira…
Finite-Element Simulation of an Accelerator Magnet: an Exercise
H. De Gersem, I. Kulchytska-Ruchka, S. Schöps
This note describes an extended exercise on the finite-element (FE) simulation of an accelerator magnet. The students construct and simulate a magnet model using the FEMM freeware.…
Towards a Parallel-in-Time Calculation of Time-Periodic Solutions with Unknown Period
Iryna Kulchytska-Ruchka, Sebastian Schöps
This paper presents a novel parallel-in-time algorithm able to compute time-periodic solutions of problems where the period is not given. Exploiting the idea of the multiple shooti…
Efficient Simulation of Field/Circuit Coupled Systems with Parallelised Waveform Relaxation
Idoia Cortes Garcia, Iryna Kulchytska-Ruchka, Sebastian Schöps
This paper proposes an efficient parallelised computation of field/circuit coupled systems co-simulated with the Waveform Relaxation (WR) technique. The main idea of the introduced…
Efficient Parallel-in-Time Solution of Time-Periodic Problems Using a Multi-Harmonic Coarse Grid Correction
Iryna Kulchytska-Ruchka, Sebastian Schöps
This paper presents a highly-parallelizable parallel-in-time algorithm for efficient solution of nonlinear time-periodic problems. It is based on the time-periodic extension of the…
An efficient steady-state analysis of the eddy current problem using a parallel-in-time algorithm
Iryna Kulchytska-Ruchka, Herbert De Gersem, Sebastian Schöps
This paper introduces a parallel-in-time algorithm for efficient steady-state solution of the eddy current problem. Its main idea is based on the application of the well-known mult…
Accelerated Steady-State Torque Computation for Induction Machines using Parallel-In-Time Algorithms
Denys Bast, Iryna Kulchytska-Ruchka, Sebastian Schöps +1
This paper focuses on efficient steady-state computations of induction machines. In particular, the periodic Parareal algorithm with initial-value coarse problem (PP-IC) is conside…
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…
A New Parareal Algorithm for Problems with Discontinuous Sources
Martin J. Gander, Iryna Kulchytska-Ruchka, Innocent Niyonzima +1
The Parareal algorithm allows to solve evolution problems exploiting parallelization in time. Its convergence and stability have been proved under the assumption of regular (smooth…