[W-SE-72] Reduction of Time Steps by Using Time Periodic Explicit Error Correction Method

Sign in to download the data

Download PDF

1. Introduction

In electrical equipment design, Computer Aided Engineering (CAE) software is used to make the best
possible products within allowable timelines. In particular, finite element analysis (FEA) for the electromagnetic
field [1] [2] is often used because of its true expressiveness of the geometries and easy handling of the
nonlinear characteristics of materials. JMAG [3] is one of the electromagnetic field FEA software, and we realize
that reduction of processing time is in great demand from our software users. In order to achieve this reduction,
JMAG has been improved the nonlinear iterative solver and ICCG solving method as well as updating shared
memory and distributed memory type parallel processing [4] for the effective use of many cores.
On the other hand, in case of the model with a large time constants in eddy current analysis, there is the
problem that many time steps are required to obtain a steady state. To counteract this, the time-period finite
element method (TP-FEM method) [5] is proposed. With this method, the steady state can be directly solved
without having to go through the transient state. Furthermore, the dimension of simultaneous linear equations
to be solved are the product of unknowns per time step and the number of time steps of one period or half
period, which has a drawback in calculation cost. To overcome this challenge, the time periodic correction
method (TP-EEC method) [6] has been proposed in recent years. In that method, by applying the Explicit Error
Correction method (EEC method) [7] with the TP-FEM method as its base, error components with slow
convergence times are removed.
As there have been many previous investigations on the effectiveness and performance of generic TP-EEC
methods [8] [9] [10], please take a look at those for further reference. In this report, we will briefly cover specific
processes of the TP-EEC method adopted by JMAG, and show the situations in which the TP-EEC method is
weak, and also the situations in which its use is powerful. The intent of this material is to inform its readers, and
to help them to decide the applicableness of these methods to their own models.

Search Filter