Parallel-in-Time Simulation of an Electrical Machine using MGRIT

TL;DR

This paper demonstrates the application of the MGRIT algorithm to parallelize the simulation of an electrical machine, achieving significant speedup by leveraging time parallelism in a computationally intensive scenario.

Contribution

It introduces the use of MGRIT for electrical machine simulation, showing its effectiveness and non-intrusive nature in reducing simulation time.

Findings

Significant speedup in simulation time with MGRIT

Effective parallelization for both linear and nonlinear models

MGRIT's non-intrusive approach facilitates integration with existing codes

Abstract

We apply the multigrid-reduction-in-time (MGRIT) algorithm to an eddy current simulation of a two-dimensional induction machine supplied by a pulse-width-modulation signal. To resolve the fast-switching excitations, small time steps are needed, such that parallelization in time becomes highly relevant for reducing the simulation time. The MGRIT algorithm is well suited for introducing time parallelism in the simulation of electrical machines using existing application codes, as MGRIT is a non-intrusive approach that essentially uses the same time integrator as a traditional time-stepping algorithm. We investigate effects of spatial coarsening on MGRIT convergence when applied to two numerical models of an induction machine, one with linear material laws and a full nonlinear model. Parallel results demonstrate significant speedup in the simulation time compared to sequential time stepping, even for moderate numbers of processors.